64
FAA-RD-78-45 Project Report ATC-80 Air Traffic Density and Distribution Measurements W. H. Harman 3 May 1979 Lincoln Laboratory MASSACHUSETTS INSTITUTE OF TECHNOLOGY LEXINGTON, MASSACHUSETTS Prepared for the Federal Aviation Administration, Washington, D.C. 20591 This document is available to the public through the National Technical Information Service, Springfield, VA 22161

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FAA-RD-78-45

Project ReportATC-80

Air Traffic Density and

Distribution Measurements

W H Harman

3 May 1979

Lincoln Laboratory MASSACHUSETTS INSTITUTE OF TECHNOLOGY

LEXINGTON MASSACHUSETTS

Prepared for the Federal Aviation Administration Washington DC 20591

This document is available to the public through

the National Technical Information Service Springfield VA 22161

This document is disseminated under the sponsorship of the Department of Transportation in the interest of information exchange The United States Government assumes no liability for its contents or use thereof

TABLE OF CONTENTS

10 INTRODUCTION 1

20 TRAFFIC IN THE LA BASIN 2

21 Spatial Distribution 2 22 Variation with Time 5

221 Short-Term Variation 5 222 Day-to-Day Variation 5

30 TRAFFIC IN OTHER LOCATIONS 10

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL 19

50 DATA VALIDITY 24

60 SUMMARY 29

REFERENCES bull 30

APPENDIX DETAILED COMPUTER OUTPUTS A-I

i

Fig No

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

A-I

A-2

A-3

A-4

A-5

LIST OF ILLUSTRATIONS

Traffic Density Map LA Basin

Range Distribution of Traffic -- LA Basin bull

Time Variation Traffic in the LA Area - Peak Location

Time Variation of Traffic in the LA Basin - Total

Short Term Variability - Cumulative Distribution of Aircraft Count bull bull bull

Short Term Variability - Comparison Between Mean and Standard Deviation bull

Day-to-Day Comparison of LA Basin Traffic

Traffic Density Map Washington DC

Traffic Density Map Philadelphia

Traffic Density Map Boston bull

Traffic Distributions in Range

Day-to-Day Comparison of Washington Traffic

Day-to-Day Comparison of Philadelphia Traffic Day-to-Day Comparison of Boston Traffic Traffic Density Map LAI Traffic Model

Range Distribution Histogram for the LAI Traffic Model

Time Variation LAI Traffic Model

Comparison Between LAl Traffic Model and TMF Measurement

X-Y Plot of Aircraft Tracks (LA Basin)

Comparison Between TMF and ARTS as the Source of Traffic Density Data - Washington DCbullbull

Comparison Between TMF and ARTS as the Source of Traffic Data - Boston bull

LA Map TMF8l26

LA Histogram TMF8l26

LA Mpa TMF8l22 bull bull

LA Histogram TMF8l22

LA Map TMF8046

Page

3

4

6

7

8

8

9

11

12

13

14

15

16

17

20

21

22

23

25

27

-J 28

A-3

A-If

A-5

A-6

A-7

ii

Fig No

A-6

A-7

A-8

A-9

A-IO

A-II

A-12

A-13

A-14

A-15

A-16

A-17

A-18

A-19

A-20

A-21

A-22

A-23

A-24

A-25

A-26

(shy

LIST OF ILLUSTRATIONS (Continued)

LA Histogram TMF8046 A-8

LA Map TMF8055 A-9

LA Histogram TMF8055 A-IO

Washington Map TMF4039 A-II

Washington Histogram TMF4039 A-12

Washington Map TMF4001 A-13

Washington Histogram TMF4001 A-14

Washington Map TMF4054 A-15

Washington Histogram TMF4054 A-16

Philadelphia Map TMF5139 A-17

Philadelphia Histogram TMF5139 A-18

Philadelphia Map TMF5026 A-19

Philadelphia Histogram TMF5026 A-20

Philadelphia Map TMF5005 A-21

Philadelphia Histogram TMF5005 A-22

Boston Map TMF3031 A-23

Boston Histogram TMF3031 A-24

Boston Map TMF3037 A-25

Boston Histogram TMF3037 A-26

Boston Map TMF3008 A-27

Boston Histogram TMF3008 bull A-28

iii

10 INTRODUCTION

This report summarizes the results of a study to determine air traffic densities at several important locations in the United States This type of information is needed in the development of air traffic control systems such as DABS and BCAS The design and evaluation of these systems depend on traffic density in several ways computer track files must be large enough to accomshymodate all of the traffic encountered and the tolerance to interference must be sufficient to permit undegraded operation even in the presence of the high levels of interference which are to be expected in high traffic density

bull This report presents the results of measurements made in 1976 to determine

the peak air traffic density its spatial distribution and its variation with time for transponder equipped aircraft in the Los Angeles area and at several locations on the East Coast

The primary facility used for these measurements was the MIT Lincoln Laboratory Transportable Measurements Facility (TMF Ref 3) The TMF was originally built and operated for the purpose of testing the design of DABS in realistic air traffic environments During these tests it was found that the quality of the TMF surveillance data was markedly superior to that of the data produced by the currently operational ATCRBS equipment Aircraft tracks in TMF were seen to be more uniform and regular having significantly fewer missed reports and having significantly improved range and azimuth accuracies (Ref 4) For this reason TMF data was used in this traffic density analysis

Discrete ddress ~eacon ~ystem (Ref 1) ~eacon Collision Avoidance ~ystem

(Ref 2)

Air Traffic Control Radar Beacon ~ystem

1

20 TRAFFIC IN THE LA BASIN

The Los Angeles Basin is reputed to have the highest traffic density in the United States As a result there is considerable interest in current LA traffic measurements

21 Spatial Distribution

Figure 1 shows a traffic density map of the LA Basin These results were obtained from a 20 minute recording of TMF data in November 1976 Each alphashynumeric symbol represents the time average of the traffic density within 10 nmi of that location That is the aircraft located within a circle of radius R = 10 nmi were counted and that count averaged over the duration of the sample (here 20 min) this average count was then divided by the area nR2 to obtain a density p in aircraft per nmi 2 The result is shown via a logarithmic scale defined as follows Let

p p = 10 10glO 0001 aircraftnmi2

Then p is converted into an integer by dropping any digits to the right of the decimal point That integer is then represented by an alphabet-extended decimal system where A = 10 B = 11 C = 12 etc The logarithmic scale is marked in Fig 1 for reference

The counting of aircraft is based on target reports and tracks A tarshyget report which correlates with a track is counted as one aircraft

When the Fig 1 data were recorded the TMF was located at Brea Cali shyfornia on a prominent hilltop radar site about 20 nmi inland from the coast (3396deg N Lat 11791deg W Long 1400 ft elev) This site affords good coverage of the LA Basin including the San Fernando Valley and the San Bernardino region Measurements which assess the coverage of this site are discussed in Section 5

The result~ in Fig 1 indicate that the spatial distribution of traffic is very nonuniform As would be expected densities are much lower over the ocean than over the land and are relatively low over the mountainous region beampinning about 15 nmi north of the TMF Peak density is seen to occur in the Long Beach area Although not as dense as the peak local concentrations are apparent in the Van NuysBurbank area in the OntarioRiverside area and along the coast southeast of LA

Figure 2 shows the range distribution of traffic about the location of maximum density namely (X Y) = (-10 nmi -10 nmi) This plot also includes for comparison two simple mathematical models uniform-in-area and uniformshyin-range Comparisons indicate that within 10 nmi the LA data may be approxshyimately described as uniform-in-area with density of 01 aircraftnmi2 and

2

ATe-so (1)

MEASUREMENT TMF 8126 SUN 21 NOVbull 1976 11 30-11 50 PST

20

middot -C

~ 0

I ~

a o z -20

-~ zgt

-40

~o -40 -20 a 20 40

X(NMI EAST MAGJ

KEY shy SYMBOL

123456789ABCOEFGHIJKLMNOpaRST~ I I I I I I I I I I I I Ii Iii I I I bull I iii Ii i i

0001 001 01 1

TRAFFIC DENSITYP (AIRCRAFTNMJ2)

FigI Traffic density map LA Basin

3

zi a) HISTOGRAM

i ATe-80 ( 2 ) -z N 10 shyX ~ o - ~ ~ ~ ~~ ~ LU - ~~ ~~~ Z - ~~~ ~~~ ~ ~~~~ Z~ ~~ IL - ~~~~~~~~ ~~~~~ ~ ~ f ~~ ~ ~ ~ a - v~~ ~Y~~~~~y~~~~ o a - ~~~~~~~~~~~~~~~~~ ~ -~~~~~~~~~~~~~~~~~~~~ --~

-~~~Y~I~~~~~~~~~~ shyIL ~~~~~~~~~~v~V~~~~~~Y~vv~vvzv~o v~ ~ ~~ ~~ vJ a ~~~~~~~~~~~~~~~~~V ~~v~v~~~~~~~~~~LU ~~~~~~y~Z ~ ~l~~~~~~~~~~~~~~~~~CD ~~v~~ ~ ~ z~~~v~ Vf ~ ~~~~~~~~~~~E o ) z o 10 20 30 40 50 60

RANGE- (NMn

b) CUMULATIVE DISTRIBUTIONa LtJ C Z ~ a 100 TMF 8126X MEASUREMENT ~

~ IL UNIFORM-IN-RANGE MODEL4 a () 3 AIRCRAFTNM a 10 ~ IL o UNIFORM-IN-AREA MODEL a 01 AIRCRAFTNM2 LU CD E )z 1- ~__oIIL-L~ L__a___II_a_L_

2 5 10 20 50 RANGE R (NMn

Fig2 Range distribution of traffic -- LA Basin

4

--

t

~

-

between 10 and 50 nmi the data may be approximately described as uniform-inshyrange with density of 3 aircraftnmi

22 Variation with Time

221 Short-Term Variation

The results shown in Figs 1 and 2 were obtained by averaging over a period of 20 minutes Variations with time throughout that period are plotted in Figs 3 and 4 Figure 3 pertains to the traffic within a range of 10 nmi of the location of highest density and Fig 4 includes all traffic within 80 nmi of the TMF

The amount of variability in aircraft count is shown in Fig 5 in the form of the cumulative distribution and in Fig 6 as the standard deviation It might have been expected that the amount of variability would agree approxshyimately with Poisson statistics In the gas model used to represent air traffic in certain cases the probability distribution of aircraft count within any region is Poisson For a random variable with Poisson distribution the standard deviation is equal to the square root of the average value (Ref 5) This relationship is plotted in Fig 6 for comparison with the data It is evident that the measurements conform to the Poisson law to first order and yet the standard deviation of the measured data is consistently less than this simple rule Possible mechanisms for this difference are (1) the structure of air traffic due to ATC and (2) the shortness of the sample (20 min) which because of the fact that it takes about 10 to 60 minutes for individual aircraft to pass through the counting region generally tends to decrease the standard deviation of the sample relative to the longer term standard deviation

222 Day-to-Day Variation

In order to assess day-to-day variation TMF data tapes recorded on different days were processed Figure 7 shows a comparison of LA Basin results on four different days Although not all identical the results are seen to be similar The primary features mentioned above in connection with tape TMF8l26 (low density over ocean and mountains peak occurring around Long Beach etc) are evident in the other three days traffic as well TMF8l26 recorded on a Sunday exhibits the highest density among these four samples but not by a large factor

The Appendix gives more detailed computer outputs for these four TMF tapes The traffic density map and the range distribution histogram centered at the location of highest density are given for each case

5

40 NUMBER OF AIRCRAFT IN EACH SCAN

30

r-

hVERAGED OVER 40 sec

AVERAGED OVER 120 sec

~

rshylL ltt a u a ltt lL o a w CD ~ J Z

20

10

CENTER POINT RANGE 10 nmi

(-10 -10)

o 50 100 150 200 250 300

SCAN NUMBER

Fig~3 Time variation traffic in the LA area - peak location shy

6

150

I-La 125 lt a U a lt La 0 100

a ILl m ~ ~ Z 75

50 CENTER POINT TMF RANGE 80 nmi

25

l -4-204521_

a 50 100 150 200 250 300

SCAN NUMBER

Fig4 Time variation of traffic in the LA Basin - Total

7

ATC-SO (5)Lt o

TAPE TMF 8128 20 MIN 8AMitlE ~ Lt 100 ---------~-~~-----7__II~____ W-C_ 25middotNMIa-C RANGE-CO() LIMIT g~ Z-CO WI() degOm 50~---------6--+---------4~-G----+---ta--cWI vl~ wzzgt-raquo i=()Oc(ZOJc( 0i ~ 0-----j50a----1-0-0a----1-5-0-------20-0~

raquodeg INSTANTANEOUS NO OF AIRCRAFT

Fig5 Short term variability - Cumulative distribution of aircraft count

ATC-SO (6)

TAPE TMF 8128 20 MIN SAMPLE

o 20 z o ~ ltgt w c 10 c a lt c z LA BASIN lt MEASUREMENTS en

50 100 150 200

AVERAGE NO OF AIRCRAFT n

Fig6 Short term variability - Comparison between mean and standard deviation

8

flgtAIRCRAFT40 9 001 AIRCRAFT

09~ ~ 0 PER nmi2 003 2

0 9 ~~~ PEAK 007 PER nml 20

~ -= o z -20

E c

-40

-60 TMF 8046 TMF 8055 THURS 1630 PST 111176 MON 1230 PST 111576

40

20a 0 ~

0 s

0 ~ -z -20 E c ~ -40

-60 TMF 8122 TMF 8126 SAT 1400 PST 112076 SUN 130 PST 112176

-60 -40 -20 o 20 40 60 -60 -40 -20 o 20 40 60

X lnmi East Mag) X lnmi East Mag)

Fig7 Day-to-day comparison of LA Basin traffic

9

30 TRAFFIC IN OTHER LOCATIONS

Figures 8 9 and 10 present traffic density maps of respectively Washington DC Philadelphia and Boston As in Fig 1 the sYmbols plotted indicate the local density averaged over the region within 10 nmi of each point The Boston data was recorded with the TMF located at Deer Island a favorable site about 2 nmi east of Logan Airport This site was found to give excellent coverage of the airspace around Boston The Philadelphia data was recorded when the TMF was located near Clementon NJ a site about 15 nmi southeast of Philadelphia International Airport also providing excellent coverage

The Washington data in Fig 8 was recorded with the TMF located at Washington National Airport In this case it was found that an excessive number of targets were recorded at close range -- thought to be primarily false targets due to reflections and imperfect sidelobe suppression Because of this condition all targets with ranges less than 2 nmi were deleted prior to the computation of traffic densities This range filtering was done only in the case of the Washington data

Cumulative range distributions N(R) of aircraft plotted in Fig 11 permit comparisons to be made among sites and among different days at each site Each curve gives the range distribution relative to the location of maximum density The curve marked high density traffic model LAl is discussed in the next section

The day-to-day similarities in LA traffic discussed above in connection with Fig 7 are also apparent here with TMF8l26 having the maximum density It is also seen that TMF8l26 exhibits the maximum density among all of the tapes reduced regardless of location The results exhibit a moderate day-to-day repeatability in each location Although the curve shapes in Fig 11 are all similar certain differences may be noted For example N(lO nmi) results at Boston Philadelphia and Washington are all approximately equal and yet N(60 nmi) results exhibit appreciable differences with Philadelphia exceeding Washington and Washington exceeding Boston In other words the traffic density in Boston falls off rapidly away from the location of peak density while Washington and Philadelphia traffic densities falloff less rapidly In all three cases the distribution beyond 10 nmi is moderately well approximately by a uniform-in-range model with 1 to 2 aircraft per nmi (which is considerably less than the 3 aircraft per nmi of LA)

Density map comparisons showing day-to-day repeatability to Washington Philadelphia and Boston are given in Figs 12 13 and 14 Day-to-day changes in spatial distribution are more evident in the Philadelphia plots as compared with the other locations These changes may be the result of the

10

ATe-80 (8)

MEASUREMENT TMF 4039 MON 24 MAY 1976 1114-1134 EDT

- E

J a 0 z

40

20

0

1

1

1

I

s t

J 1 ( J r 1 ~

- -- L 1 Sshy f 4 6 pound J ( f c~~j

I ~ i f

~ ~l l C D I bull A C- 1gt

7 ~

~ 4 45 bull bull ~ ~ 1 1 amp

3 1 I

t 7 s f 1 r 1 f 9

c ~c

bull ~

bull t

8

4shy

3

4shy

J

7

1

z

I

1

~

t

Z 1

~ Z ~

gtshy-20

I t r ( ( ~ sshy f

( ~ S ~

-40 i S

-40 -20 a 20 40 60

X(NMI EAST MAG) KEY -

SYMBOL

123456189ABCDEFGHlJKLMNOPQRST i 11111111 IIIILi iii iii

0001 001 01 1

TRAFFIC DENSITY p (AIRCRAFTINMl2)

Fig8 Traffic density map Washington DC

11

ATe-80 (9)

MEASUREMENT TMF 5026 THURS 24 JUNE 1976 1358-1428 EDTshy

r 7 t bull or r I 7 1 9 q

40

1 z20 3

r r r o

r r r r

Z~

4

3 4

4

-gt -20 ~

r I I

I

7 J 11 I I shy __ - I I

1tN6E ur _ I P~UNIamp--71IIS ~s_ 1

-60 -4Q -20 o 20 40 60

X(NMI EASTMAGJ

KEY shySYMBOL

1234 56789ABCOE FGH IJ KLMNOPQRST 11111111 IIIILI ~I iii bull ~I

0001 001 01 1

TRAFFIC DENSITYp CAIRCRAFTNMI2)

Fig9 Traffic density map Philadelphia

12

ATe-so (10)

MEASUREMENT TMF 3037 MON 29 MARCH1976 1541-1559 EST

I bull

- ~

lt ~

I t-a 0 Z

i z-gtshy

40

20

O

-20

-40

1 r 7

f r 7

~ -f r r 6 I

1 -f 1 ~ 7 if 1

~ ~ ~ 1 ( 1 t

I I 7 7 -A A

I -shy

1 1 8 e 1)

I

1 7 I~

~ bull UJHtN

I IVTAlIshy I

1 7 7 1 ~ 1 p Il shy--------shy7 7 If ~ to ~ ( bull ~--I

11 f7 1 A (

1 ~ A 1 bull 1---

r

f

1

if

bull 6shy

V

l bull Z 1

r z

I z

I

~~c~AFr I yM L I

J I I

I I

z 4 llfmiddot

J l~~

~Ifv1~

-40 -20 0 20 40

XCNMI EAST MAGJ

KEY -SYMBOL

12345678 9ABCDE FGH I J K LMNOPQRS T I I I I I I I I I I I I I l-I i i i V

0001 001 01 1

TRAFFIC DENSITYp (AlRCRAFTNMl2 )

FigIO Traffic density map Boston

13

1000

l18-4-19158 L LA HIGH DENSITY

TRAFFIC MODEL LA

0

W () Z ~ 0

Z I 100 t shy

~

t shy~

~ 0 U Q

ltt ~

o Q W m ~ 10 Z

w () ~ Q W

~

1 _---_--1_6---1-- shy

201052

RANGE R (nmi)

Fig11 Traffic distributions

bull J

6-----

50 100

in range

14

(

CI ~ ~

~

=E ~

IL 0 z ~ a ~

E c

gtshy

Ishy

Fig12

40

20

0

-40 TMF 4001 THURS MAY 6 1976

40

20

-20

-40

40

20

TMF 4045 FRI MAY 28 1976

-60 -40 -20

-40

-20

C42-1705

1600 EDT

40

1300 EDT

0 20 40 60

x (nmi EAST OF TMF MAG)

Day-to-day comparison of Washington traffic

15

C42-1706

40

20

O~---+---++W---------i

-20 )

TMF 5005 -40 TUES JUNE 15 1976 1000 EDT

C)

lt 4i

u i 0 ~

I a 0 z E c

~

40

20

O~---f--l~_~----------l

-20

-40

x (nml EAST OF TMF MAG)

Fig 13 Day-to-day comparison of Philadelphia traffic

16

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

-~Z 30 I- shyf shy

-~ lL ltX f- - shya U a lti I- shy

lL 20 ~ I--

shyo a -- f-_ w -00 ~ -I shy -shyJ shyZ

I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

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FigA-2 LA histogram TMF8126

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100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

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FigA-4 LA histogram TMF8122

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100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

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X (nmi East Mag)

FigA-5 LA map TMF8046

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9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

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FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

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FigA-7 LA map TMF8055

A-9

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FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

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gt- -25 - 3 5 6 7 8 9 8 9 9 1 2 5 5 6 1 1 8 8 8

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-50 - 1 233 3 2 1 222 1 -223 If 2 1 1 12 3 1 t

2 3 3 1 1 2 1

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I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

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rshy

-- -05 shy- Ishy

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mJ4 o 10 20 4030 50 60 70 9080 100

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FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

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0 Ol

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1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

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1 3 3 3 1 1

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1 I I I I j _ I l

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X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

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h I I I o

10 20 30 40 50 60 70 80 90 100

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FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

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1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

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bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

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1 332 1 1

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8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

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FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

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05 shy

n I I I

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FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

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-75 - 2 3 2 1 -

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FigA-15 Philadelphia map TMF5I39

A-17

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f-

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FigA-16 Philadelphia histogram TMF5I39

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l-4-20476middotL

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50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

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A-28

This document is disseminated under the sponsorship of the Department of Transportation in the interest of information exchange The United States Government assumes no liability for its contents or use thereof

TABLE OF CONTENTS

10 INTRODUCTION 1

20 TRAFFIC IN THE LA BASIN 2

21 Spatial Distribution 2 22 Variation with Time 5

221 Short-Term Variation 5 222 Day-to-Day Variation 5

30 TRAFFIC IN OTHER LOCATIONS 10

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL 19

50 DATA VALIDITY 24

60 SUMMARY 29

REFERENCES bull 30

APPENDIX DETAILED COMPUTER OUTPUTS A-I

i

Fig No

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

A-I

A-2

A-3

A-4

A-5

LIST OF ILLUSTRATIONS

Traffic Density Map LA Basin

Range Distribution of Traffic -- LA Basin bull

Time Variation Traffic in the LA Area - Peak Location

Time Variation of Traffic in the LA Basin - Total

Short Term Variability - Cumulative Distribution of Aircraft Count bull bull bull

Short Term Variability - Comparison Between Mean and Standard Deviation bull

Day-to-Day Comparison of LA Basin Traffic

Traffic Density Map Washington DC

Traffic Density Map Philadelphia

Traffic Density Map Boston bull

Traffic Distributions in Range

Day-to-Day Comparison of Washington Traffic

Day-to-Day Comparison of Philadelphia Traffic Day-to-Day Comparison of Boston Traffic Traffic Density Map LAI Traffic Model

Range Distribution Histogram for the LAI Traffic Model

Time Variation LAI Traffic Model

Comparison Between LAl Traffic Model and TMF Measurement

X-Y Plot of Aircraft Tracks (LA Basin)

Comparison Between TMF and ARTS as the Source of Traffic Density Data - Washington DCbullbull

Comparison Between TMF and ARTS as the Source of Traffic Data - Boston bull

LA Map TMF8l26

LA Histogram TMF8l26

LA Mpa TMF8l22 bull bull

LA Histogram TMF8l22

LA Map TMF8046

Page

3

4

6

7

8

8

9

11

12

13

14

15

16

17

20

21

22

23

25

27

-J 28

A-3

A-If

A-5

A-6

A-7

ii

Fig No

A-6

A-7

A-8

A-9

A-IO

A-II

A-12

A-13

A-14

A-15

A-16

A-17

A-18

A-19

A-20

A-21

A-22

A-23

A-24

A-25

A-26

(shy

LIST OF ILLUSTRATIONS (Continued)

LA Histogram TMF8046 A-8

LA Map TMF8055 A-9

LA Histogram TMF8055 A-IO

Washington Map TMF4039 A-II

Washington Histogram TMF4039 A-12

Washington Map TMF4001 A-13

Washington Histogram TMF4001 A-14

Washington Map TMF4054 A-15

Washington Histogram TMF4054 A-16

Philadelphia Map TMF5139 A-17

Philadelphia Histogram TMF5139 A-18

Philadelphia Map TMF5026 A-19

Philadelphia Histogram TMF5026 A-20

Philadelphia Map TMF5005 A-21

Philadelphia Histogram TMF5005 A-22

Boston Map TMF3031 A-23

Boston Histogram TMF3031 A-24

Boston Map TMF3037 A-25

Boston Histogram TMF3037 A-26

Boston Map TMF3008 A-27

Boston Histogram TMF3008 bull A-28

iii

10 INTRODUCTION

This report summarizes the results of a study to determine air traffic densities at several important locations in the United States This type of information is needed in the development of air traffic control systems such as DABS and BCAS The design and evaluation of these systems depend on traffic density in several ways computer track files must be large enough to accomshymodate all of the traffic encountered and the tolerance to interference must be sufficient to permit undegraded operation even in the presence of the high levels of interference which are to be expected in high traffic density

bull This report presents the results of measurements made in 1976 to determine

the peak air traffic density its spatial distribution and its variation with time for transponder equipped aircraft in the Los Angeles area and at several locations on the East Coast

The primary facility used for these measurements was the MIT Lincoln Laboratory Transportable Measurements Facility (TMF Ref 3) The TMF was originally built and operated for the purpose of testing the design of DABS in realistic air traffic environments During these tests it was found that the quality of the TMF surveillance data was markedly superior to that of the data produced by the currently operational ATCRBS equipment Aircraft tracks in TMF were seen to be more uniform and regular having significantly fewer missed reports and having significantly improved range and azimuth accuracies (Ref 4) For this reason TMF data was used in this traffic density analysis

Discrete ddress ~eacon ~ystem (Ref 1) ~eacon Collision Avoidance ~ystem

(Ref 2)

Air Traffic Control Radar Beacon ~ystem

1

20 TRAFFIC IN THE LA BASIN

The Los Angeles Basin is reputed to have the highest traffic density in the United States As a result there is considerable interest in current LA traffic measurements

21 Spatial Distribution

Figure 1 shows a traffic density map of the LA Basin These results were obtained from a 20 minute recording of TMF data in November 1976 Each alphashynumeric symbol represents the time average of the traffic density within 10 nmi of that location That is the aircraft located within a circle of radius R = 10 nmi were counted and that count averaged over the duration of the sample (here 20 min) this average count was then divided by the area nR2 to obtain a density p in aircraft per nmi 2 The result is shown via a logarithmic scale defined as follows Let

p p = 10 10glO 0001 aircraftnmi2

Then p is converted into an integer by dropping any digits to the right of the decimal point That integer is then represented by an alphabet-extended decimal system where A = 10 B = 11 C = 12 etc The logarithmic scale is marked in Fig 1 for reference

The counting of aircraft is based on target reports and tracks A tarshyget report which correlates with a track is counted as one aircraft

When the Fig 1 data were recorded the TMF was located at Brea Cali shyfornia on a prominent hilltop radar site about 20 nmi inland from the coast (3396deg N Lat 11791deg W Long 1400 ft elev) This site affords good coverage of the LA Basin including the San Fernando Valley and the San Bernardino region Measurements which assess the coverage of this site are discussed in Section 5

The result~ in Fig 1 indicate that the spatial distribution of traffic is very nonuniform As would be expected densities are much lower over the ocean than over the land and are relatively low over the mountainous region beampinning about 15 nmi north of the TMF Peak density is seen to occur in the Long Beach area Although not as dense as the peak local concentrations are apparent in the Van NuysBurbank area in the OntarioRiverside area and along the coast southeast of LA

Figure 2 shows the range distribution of traffic about the location of maximum density namely (X Y) = (-10 nmi -10 nmi) This plot also includes for comparison two simple mathematical models uniform-in-area and uniformshyin-range Comparisons indicate that within 10 nmi the LA data may be approxshyimately described as uniform-in-area with density of 01 aircraftnmi2 and

2

ATe-so (1)

MEASUREMENT TMF 8126 SUN 21 NOVbull 1976 11 30-11 50 PST

20

middot -C

~ 0

I ~

a o z -20

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-40

~o -40 -20 a 20 40

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0001 001 01 1

TRAFFIC DENSITYP (AIRCRAFTNMJ2)

FigI Traffic density map LA Basin

3

zi a) HISTOGRAM

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b) CUMULATIVE DISTRIBUTIONa LtJ C Z ~ a 100 TMF 8126X MEASUREMENT ~

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2 5 10 20 50 RANGE R (NMn

Fig2 Range distribution of traffic -- LA Basin

4

--

t

~

-

between 10 and 50 nmi the data may be approximately described as uniform-inshyrange with density of 3 aircraftnmi

22 Variation with Time

221 Short-Term Variation

The results shown in Figs 1 and 2 were obtained by averaging over a period of 20 minutes Variations with time throughout that period are plotted in Figs 3 and 4 Figure 3 pertains to the traffic within a range of 10 nmi of the location of highest density and Fig 4 includes all traffic within 80 nmi of the TMF

The amount of variability in aircraft count is shown in Fig 5 in the form of the cumulative distribution and in Fig 6 as the standard deviation It might have been expected that the amount of variability would agree approxshyimately with Poisson statistics In the gas model used to represent air traffic in certain cases the probability distribution of aircraft count within any region is Poisson For a random variable with Poisson distribution the standard deviation is equal to the square root of the average value (Ref 5) This relationship is plotted in Fig 6 for comparison with the data It is evident that the measurements conform to the Poisson law to first order and yet the standard deviation of the measured data is consistently less than this simple rule Possible mechanisms for this difference are (1) the structure of air traffic due to ATC and (2) the shortness of the sample (20 min) which because of the fact that it takes about 10 to 60 minutes for individual aircraft to pass through the counting region generally tends to decrease the standard deviation of the sample relative to the longer term standard deviation

222 Day-to-Day Variation

In order to assess day-to-day variation TMF data tapes recorded on different days were processed Figure 7 shows a comparison of LA Basin results on four different days Although not all identical the results are seen to be similar The primary features mentioned above in connection with tape TMF8l26 (low density over ocean and mountains peak occurring around Long Beach etc) are evident in the other three days traffic as well TMF8l26 recorded on a Sunday exhibits the highest density among these four samples but not by a large factor

The Appendix gives more detailed computer outputs for these four TMF tapes The traffic density map and the range distribution histogram centered at the location of highest density are given for each case

5

40 NUMBER OF AIRCRAFT IN EACH SCAN

30

r-

hVERAGED OVER 40 sec

AVERAGED OVER 120 sec

~

rshylL ltt a u a ltt lL o a w CD ~ J Z

20

10

CENTER POINT RANGE 10 nmi

(-10 -10)

o 50 100 150 200 250 300

SCAN NUMBER

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6

150

I-La 125 lt a U a lt La 0 100

a ILl m ~ ~ Z 75

50 CENTER POINT TMF RANGE 80 nmi

25

l -4-204521_

a 50 100 150 200 250 300

SCAN NUMBER

Fig4 Time variation of traffic in the LA Basin - Total

7

ATC-SO (5)Lt o

TAPE TMF 8128 20 MIN 8AMitlE ~ Lt 100 ---------~-~~-----7__II~____ W-C_ 25middotNMIa-C RANGE-CO() LIMIT g~ Z-CO WI() degOm 50~---------6--+---------4~-G----+---ta--cWI vl~ wzzgt-raquo i=()Oc(ZOJc( 0i ~ 0-----j50a----1-0-0a----1-5-0-------20-0~

raquodeg INSTANTANEOUS NO OF AIRCRAFT

Fig5 Short term variability - Cumulative distribution of aircraft count

ATC-SO (6)

TAPE TMF 8128 20 MIN SAMPLE

o 20 z o ~ ltgt w c 10 c a lt c z LA BASIN lt MEASUREMENTS en

50 100 150 200

AVERAGE NO OF AIRCRAFT n

Fig6 Short term variability - Comparison between mean and standard deviation

8

flgtAIRCRAFT40 9 001 AIRCRAFT

09~ ~ 0 PER nmi2 003 2

0 9 ~~~ PEAK 007 PER nml 20

~ -= o z -20

E c

-40

-60 TMF 8046 TMF 8055 THURS 1630 PST 111176 MON 1230 PST 111576

40

20a 0 ~

0 s

0 ~ -z -20 E c ~ -40

-60 TMF 8122 TMF 8126 SAT 1400 PST 112076 SUN 130 PST 112176

-60 -40 -20 o 20 40 60 -60 -40 -20 o 20 40 60

X lnmi East Mag) X lnmi East Mag)

Fig7 Day-to-day comparison of LA Basin traffic

9

30 TRAFFIC IN OTHER LOCATIONS

Figures 8 9 and 10 present traffic density maps of respectively Washington DC Philadelphia and Boston As in Fig 1 the sYmbols plotted indicate the local density averaged over the region within 10 nmi of each point The Boston data was recorded with the TMF located at Deer Island a favorable site about 2 nmi east of Logan Airport This site was found to give excellent coverage of the airspace around Boston The Philadelphia data was recorded when the TMF was located near Clementon NJ a site about 15 nmi southeast of Philadelphia International Airport also providing excellent coverage

The Washington data in Fig 8 was recorded with the TMF located at Washington National Airport In this case it was found that an excessive number of targets were recorded at close range -- thought to be primarily false targets due to reflections and imperfect sidelobe suppression Because of this condition all targets with ranges less than 2 nmi were deleted prior to the computation of traffic densities This range filtering was done only in the case of the Washington data

Cumulative range distributions N(R) of aircraft plotted in Fig 11 permit comparisons to be made among sites and among different days at each site Each curve gives the range distribution relative to the location of maximum density The curve marked high density traffic model LAl is discussed in the next section

The day-to-day similarities in LA traffic discussed above in connection with Fig 7 are also apparent here with TMF8l26 having the maximum density It is also seen that TMF8l26 exhibits the maximum density among all of the tapes reduced regardless of location The results exhibit a moderate day-to-day repeatability in each location Although the curve shapes in Fig 11 are all similar certain differences may be noted For example N(lO nmi) results at Boston Philadelphia and Washington are all approximately equal and yet N(60 nmi) results exhibit appreciable differences with Philadelphia exceeding Washington and Washington exceeding Boston In other words the traffic density in Boston falls off rapidly away from the location of peak density while Washington and Philadelphia traffic densities falloff less rapidly In all three cases the distribution beyond 10 nmi is moderately well approximately by a uniform-in-range model with 1 to 2 aircraft per nmi (which is considerably less than the 3 aircraft per nmi of LA)

Density map comparisons showing day-to-day repeatability to Washington Philadelphia and Boston are given in Figs 12 13 and 14 Day-to-day changes in spatial distribution are more evident in the Philadelphia plots as compared with the other locations These changes may be the result of the

10

ATe-80 (8)

MEASUREMENT TMF 4039 MON 24 MAY 1976 1114-1134 EDT

- E

J a 0 z

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1

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SYMBOL

123456189ABCDEFGHlJKLMNOPQRST i 11111111 IIIILi iii iii

0001 001 01 1

TRAFFIC DENSITY p (AIRCRAFTINMl2)

Fig8 Traffic density map Washington DC

11

ATe-80 (9)

MEASUREMENT TMF 5026 THURS 24 JUNE 1976 1358-1428 EDTshy

r 7 t bull or r I 7 1 9 q

40

1 z20 3

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1234 56789ABCOE FGH IJ KLMNOPQRST 11111111 IIIILI ~I iii bull ~I

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TRAFFIC DENSITYp CAIRCRAFTNMI2)

Fig9 Traffic density map Philadelphia

12

ATe-so (10)

MEASUREMENT TMF 3037 MON 29 MARCH1976 1541-1559 EST

I bull

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1 7 7 1 ~ 1 p Il shy--------shy7 7 If ~ to ~ ( bull ~--I

11 f7 1 A (

1 ~ A 1 bull 1---

r

f

1

if

bull 6shy

V

l bull Z 1

r z

I z

I

~~c~AFr I yM L I

J I I

I I

z 4 llfmiddot

J l~~

~Ifv1~

-40 -20 0 20 40

XCNMI EAST MAGJ

KEY -SYMBOL

12345678 9ABCDE FGH I J K LMNOPQRS T I I I I I I I I I I I I I l-I i i i V

0001 001 01 1

TRAFFIC DENSITYp (AlRCRAFTNMl2 )

FigIO Traffic density map Boston

13

1000

l18-4-19158 L LA HIGH DENSITY

TRAFFIC MODEL LA

0

W () Z ~ 0

Z I 100 t shy

~

t shy~

~ 0 U Q

ltt ~

o Q W m ~ 10 Z

w () ~ Q W

~

1 _---_--1_6---1-- shy

201052

RANGE R (nmi)

Fig11 Traffic distributions

bull J

6-----

50 100

in range

14

(

CI ~ ~

~

=E ~

IL 0 z ~ a ~

E c

gtshy

Ishy

Fig12

40

20

0

-40 TMF 4001 THURS MAY 6 1976

40

20

-20

-40

40

20

TMF 4045 FRI MAY 28 1976

-60 -40 -20

-40

-20

C42-1705

1600 EDT

40

1300 EDT

0 20 40 60

x (nmi EAST OF TMF MAG)

Day-to-day comparison of Washington traffic

15

C42-1706

40

20

O~---+---++W---------i

-20 )

TMF 5005 -40 TUES JUNE 15 1976 1000 EDT

C)

lt 4i

u i 0 ~

I a 0 z E c

~

40

20

O~---f--l~_~----------l

-20

-40

x (nml EAST OF TMF MAG)

Fig 13 Day-to-day comparison of Philadelphia traffic

16

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

-~Z 30 I- shyf shy

-~ lL ltX f- - shya U a lti I- shy

lL 20 ~ I--

shyo a -- f-_ w -00 ~ -I shy -shyJ shyZ

I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

-1-4-20460 shy

fshy -

-50

~

cshy o Z

E c

50

o

f shy

~

I

2

I

I I

I 1 3 t 3 1 1

1 3 t 6 7 5 3 3 2 5 t 5 7 A A A 9 6 I 6

6 9 8 C 0 C A 6 3 5 7 C C E F E 0 8 9 8 C

2 7 9 C E G G G F 0 0 0 E 5 8 8 o E F G H G E E F F 7 9 Il euro --iH-6 II 6 amp--shy7 8 9 8 8 0 F G H I I I I 5 7 8 8 8 9 8 F H I J J J I 3 I I 3 2 3 C F r J J J

9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

I 5 6 5 2 3 3 2

I

I I I 2 I

I 2 3 2 I 2 2 2 t t 3 2

2 2 3 t ~ 6 r 2 2 2 3 3 5 6 D t I

6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

6 F F E [)-euro-- euro--iHt-amp---tr--6--tr-4 H G F E C C A A 9 7 6 6 6 6 I

I H l 0 8 A987t3t31 H G F C A 66132 G F E C 9 I 232 0 0 C C 8 9 7 2 ~ 5 I

9 8 C C C 8 A 8 7 7 6 t

5 8 A C C C 8 8 A 8 8 6 1

6 7 9 8 C C 8 A 9 8 6 t

1 3 5 6 7 9 8 8 B B 7 6 I

3 I 6 9 B B 9 8 5 3 3 5 7 9 9 9 6 3

1 1 I 3 6 7 6 3 1 I

I ~

-

-

-

-

- -

-100

I I

-50 I

o I I

50

I

taO

X (nmi East 1 Mag)

FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

E

c CJ

7 ~ shyI I shyU ~

ltt ~ -shyw Z I- shy

6 l- shy l shylJ I shyltt a

~ u I- shy5a ~-

4 lJ 0 I shy

shya 4 ~

W CD

~

~ - r-_

z ~ - - shy

3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

2 If 6 888 8 C C 9 6 t 3 If A C 0 o C 8 8 It 8 8 7 6 6 6 If

2 t 7 9 888 DEE C A A It 8 E F F F 0 C 8 A A A 9 7 7 6 If 2 rshy~

o Z

0

2 5 8 9 ABC 0 E F FED 0 o E 379 A ceo 0 E F G G F G F F- - - - -

If 8 9 9 Ace 0 F F H H H H H

G G G G E 0 B A A A 9 9 8 7 5 G H G F E C A B 8 A 9 8 8 6 5

- r v bull v

H G FEe C A A 9 7 656 5 5

2

E c-

2 6 8 8 A A 8 C E G H I I 3lf5776AE G H I

I I

I I

H F C 8 899 7 6 2 1 If H G C 9 776 2

If

1 3

1 2 1 8 E F G H H GEe 9 5 5 2 gt- - 25 - 3 A C C 0 F E 0 C It A 8 5 5 5 2 -

5 8 8 7 A B 888 A A 9 7 6 3 If 6 6 1 6 9 A 8 8 8 A 8 5 1 2 5 If 1 1 2 7 A 8 B 8 8 5 2

2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

~7 shy

r-

t- ~~

~ ltt a 6 ~ shyu 0 r-I shy

lti r shy

~

0 ~

5 shyr-a

~

shyw CD ~ - shygt -

4 shyz fshy -

rshy

-1--shy~ -

I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

75

I 2 2 I 3 J 2

2 + + 3 2 50 2 5 5 At J

I 3 2 I 2 + 5 5 5 2 3 At At At 3 + 5 Igt 5 + 1 1

I 3 5 6 6 7 Igt 8 5 5 3 I 2 3 2 1 2 3 At 6 8 8 8 1 2 Igt 8 8 l 2 I I + J I

25 I 2 2 5 A B A 1 Igt 1 7 1 5 5 6 Igt 5 3 1 2 3 3 1 CO D I I I At 8 A C C 8 8 + 3 I A 8 8 8 A 8 1 5 5 Igt 8 7 7 5 2 2 2 3 6 9 B C E E 0 C 9 8 A 0 0 0 0 8 A 1 Igt 1 1 8 8 7 5 2 ~ 2 At It 6 8 A C E F F F E 0 C C E F E 0 A 9 Igt Igt 7 7 7 7 5 1 ~ 0 Z

a 2 It

It

5

6

6

7

8

8

8

9

B C E F H I H GEE -++-t-j-fmiddot-~ oF-

A B C F H r J I H G

F FEe 8 9-9- f Dell a 8 9

8

II

7

9

1

8

7

8

6

6

5

5

It

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I

e c gt- -25

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7 8 Igt 7 It 5

3

9 A A D G I I r I 4

7 8 9 9 0 G H H 11

66669CE G 2 + At + 7 9 A A C 0

G E C 1 G E f A

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9 I

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8

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9

5

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8 6 J It

7 7 5

5

Igt tl

5 5

5 5 + 3

3 3 2 2

I 3 + 5 1 9 9 9 8 A II A A II A 9 7 5 5 5 + I I I 3 + 5 7 8 8 9 8 r 889 A A ~ 8 8 7 5 1

2 3 3 + 6 Igt Igt 7 8 9 8 5 2 l 1 9 A A 9 7 5 I

2 3 3 57768A4 A I J 5 9 A 8 1 5

-50 2 3 I

3 5 2

Igt 5 1

7 Igt

7 5 5

7 1

Igt

9 9

8

A 4

9

A

B

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8

1

8

5

1 J 5

J J b

If

6 b

(I A II

7 9

A II

9

9 7

9 7 t

6 1

I + 5 5 Igt 7 II 8 7 7 b b 7 Igt It

I J J I b b i) b b b 5 J -75 1 3 + 5 I 1

I I 2

~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

-

7 CENTERPOINT -20 nmi -5 nmi -

6 - -rshylL

r shy _

lt -0 U 0 5 - -lt

lL _ r-

o -0 W 4 - -CD ~ ~ r-

z -

shy--

2 fshy -- -

rshy -

1-shyI--~-

-

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

Ishy

~-

t -75

-50

25

gt- -25

r-o 0 z

E c

1

1 1 2

A bull amp

1

2 2 2 1 If

2

2 2 2 2 4f

If bull

2

1

3 2 4f

5 1 V

4f

3

1 2 2 5 5 1 8 A V

6 If 2

1 2 1 1 3 3 2 2 1 7 3 2 2 2 2 5 6 6 5 3 1 6 7 7 3 2 3 2 2 1 6 8 9 9 8 4f 1 6 6 7 3 5 4f 4f 4f 1 1 7 9 B B A 8 poundf 2 3 At 9 7 8 8 8 6 6 At 4f 5 6 7 8 A C 0 C B 9 8 A A C 0 C 8 B 9 8 1 1 1 1 8 9 B C 0 0 0 0 C C 0 E E E o D B A 9 8 1 1 1 9 A C E F F E 0 E E F F E E 0 C 8 A 8 1 6 6 A - - shy - r _ A

V V V V

1 8 B E F G G G G G o C C B B 8 A 9 1 5 3 3 5 6 8 C F G G H H H G F 0 C 8 8 A 9 1 At 2 1 3 If 5 9 0 F G H H I H G F C C 8 9 8 6 3 2 L 3 6 A C E F Ii H H G E C 8 A 9 1 6 3

2 2 It 7 9 8 C 0 E F F 0 C B A 9 9 7 6 1 2 3 If 6 7 7 8 9 C C B A A B A A 8 7 5

1 2 If 5 6 6 7 7 8 8 9 9 A A 8 8 A 9 5 1 1 2 5 5 6 6 6 7 7 7 1 9 A 8 8 B 8 3

3 It If It At At If 5 5 6 8 A A A 9 3 1 2 2 2 2 1 2 3 t 6 8 A A 8 t

2 t 6 9 8 A 8 5 1 I 3 3 3 8 9 9 A 7 At

I 1 3 It t 1 1 8 8 3 1 2 3 If 2 1 5 6

I 1 1

7 8 7 7

3

5 6 6

5

2

3 At

4f 3 ~

1

1 1

-

-

-

-

I I I J I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-7 LA map TMF8055

A-9

- -

8 I I r- r J I I I

--4-20467 L ~7 shy

I shy

I- CENTERPOINT -5 nmi -15 nmi _6 ~

f shy

~shy 5 shy

IJ I- shyltX ~

n u I shyn

I shyltX r- r shy

~ ~- shyIJ o

l- f shy0 W CD ~ ~ ~ ~ z 3 - - shy

-rshy

~ f-f- shy2 - shy

-f- shy

~ ~-~ -I shy

- nTh+-_ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

2 3 3 6 1 881 665 6 6 6 6 It 1 1 3 5 6 1 8 9 981 888 8 1 1 6 ~

1 1 1 3 5 8 A 8 8 988 999 9 1 5 3 1 1 3 3 1 1 3 5 6 9 8 C D 989 A A 9 8 5 2 3 3 3 2

25 - 1 3 5 5 2 2 3 6 9 C o U A 9 A A 8 9 6 If 2 3 4f It 3 -1 3 5 5 6 5 1 A C o 0 888 889 6 If It 2

5 6 5 6 A 0 f E 0 C 8 C C 8 9 6 5 5 5 3 1 ~ 2 If 5 5 1 C E F F E o C 8 8 8 9 1 5 5 3 3 2

Lshy~

o z

0 1 1 12236 8 0 F F F E shy bull v

1 1 8 A A C 0 0 o 0

E 0 8 8 A A 1 5 - ~ v v

E C C 9 8 8 If

3 3 If If 2

3 1

2

E c

1 9 A A b B B 8 8 3 1 8 J 9 A A 9 9 A

0 C B 7 6 33 3 2 1 B A 8 6 3 2 3 3 2

gt- -25 - 3 5 6 7 8 9 8 9 9 1 2 5 5 6 1 1 8 8 8

A 9 2 1 5 2 1 2

1 2 2 2 1 3 3 3 2 1 -

5 6 6 5 5 6 7 1 1 6 222 2 3 3 3 2 1 3 5 6 6 6 5 5 5 5 5 If 3 1 122 3 3 2 1 3 5 6 6 5 5 3 If If 2 1 1 2 1 1 2 5 2 1 If 3 3 2 1 122 1

-50 - 1 233 3 2 1 222 1 -223 If 2 1 1 12 3 1 t

2 3 3 1 1 2 1

-75 ~ -

I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

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A-24

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A-28

TABLE OF CONTENTS

10 INTRODUCTION 1

20 TRAFFIC IN THE LA BASIN 2

21 Spatial Distribution 2 22 Variation with Time 5

221 Short-Term Variation 5 222 Day-to-Day Variation 5

30 TRAFFIC IN OTHER LOCATIONS 10

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL 19

50 DATA VALIDITY 24

60 SUMMARY 29

REFERENCES bull 30

APPENDIX DETAILED COMPUTER OUTPUTS A-I

i

Fig No

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

A-I

A-2

A-3

A-4

A-5

LIST OF ILLUSTRATIONS

Traffic Density Map LA Basin

Range Distribution of Traffic -- LA Basin bull

Time Variation Traffic in the LA Area - Peak Location

Time Variation of Traffic in the LA Basin - Total

Short Term Variability - Cumulative Distribution of Aircraft Count bull bull bull

Short Term Variability - Comparison Between Mean and Standard Deviation bull

Day-to-Day Comparison of LA Basin Traffic

Traffic Density Map Washington DC

Traffic Density Map Philadelphia

Traffic Density Map Boston bull

Traffic Distributions in Range

Day-to-Day Comparison of Washington Traffic

Day-to-Day Comparison of Philadelphia Traffic Day-to-Day Comparison of Boston Traffic Traffic Density Map LAI Traffic Model

Range Distribution Histogram for the LAI Traffic Model

Time Variation LAI Traffic Model

Comparison Between LAl Traffic Model and TMF Measurement

X-Y Plot of Aircraft Tracks (LA Basin)

Comparison Between TMF and ARTS as the Source of Traffic Density Data - Washington DCbullbull

Comparison Between TMF and ARTS as the Source of Traffic Data - Boston bull

LA Map TMF8l26

LA Histogram TMF8l26

LA Mpa TMF8l22 bull bull

LA Histogram TMF8l22

LA Map TMF8046

Page

3

4

6

7

8

8

9

11

12

13

14

15

16

17

20

21

22

23

25

27

-J 28

A-3

A-If

A-5

A-6

A-7

ii

Fig No

A-6

A-7

A-8

A-9

A-IO

A-II

A-12

A-13

A-14

A-15

A-16

A-17

A-18

A-19

A-20

A-21

A-22

A-23

A-24

A-25

A-26

(shy

LIST OF ILLUSTRATIONS (Continued)

LA Histogram TMF8046 A-8

LA Map TMF8055 A-9

LA Histogram TMF8055 A-IO

Washington Map TMF4039 A-II

Washington Histogram TMF4039 A-12

Washington Map TMF4001 A-13

Washington Histogram TMF4001 A-14

Washington Map TMF4054 A-15

Washington Histogram TMF4054 A-16

Philadelphia Map TMF5139 A-17

Philadelphia Histogram TMF5139 A-18

Philadelphia Map TMF5026 A-19

Philadelphia Histogram TMF5026 A-20

Philadelphia Map TMF5005 A-21

Philadelphia Histogram TMF5005 A-22

Boston Map TMF3031 A-23

Boston Histogram TMF3031 A-24

Boston Map TMF3037 A-25

Boston Histogram TMF3037 A-26

Boston Map TMF3008 A-27

Boston Histogram TMF3008 bull A-28

iii

10 INTRODUCTION

This report summarizes the results of a study to determine air traffic densities at several important locations in the United States This type of information is needed in the development of air traffic control systems such as DABS and BCAS The design and evaluation of these systems depend on traffic density in several ways computer track files must be large enough to accomshymodate all of the traffic encountered and the tolerance to interference must be sufficient to permit undegraded operation even in the presence of the high levels of interference which are to be expected in high traffic density

bull This report presents the results of measurements made in 1976 to determine

the peak air traffic density its spatial distribution and its variation with time for transponder equipped aircraft in the Los Angeles area and at several locations on the East Coast

The primary facility used for these measurements was the MIT Lincoln Laboratory Transportable Measurements Facility (TMF Ref 3) The TMF was originally built and operated for the purpose of testing the design of DABS in realistic air traffic environments During these tests it was found that the quality of the TMF surveillance data was markedly superior to that of the data produced by the currently operational ATCRBS equipment Aircraft tracks in TMF were seen to be more uniform and regular having significantly fewer missed reports and having significantly improved range and azimuth accuracies (Ref 4) For this reason TMF data was used in this traffic density analysis

Discrete ddress ~eacon ~ystem (Ref 1) ~eacon Collision Avoidance ~ystem

(Ref 2)

Air Traffic Control Radar Beacon ~ystem

1

20 TRAFFIC IN THE LA BASIN

The Los Angeles Basin is reputed to have the highest traffic density in the United States As a result there is considerable interest in current LA traffic measurements

21 Spatial Distribution

Figure 1 shows a traffic density map of the LA Basin These results were obtained from a 20 minute recording of TMF data in November 1976 Each alphashynumeric symbol represents the time average of the traffic density within 10 nmi of that location That is the aircraft located within a circle of radius R = 10 nmi were counted and that count averaged over the duration of the sample (here 20 min) this average count was then divided by the area nR2 to obtain a density p in aircraft per nmi 2 The result is shown via a logarithmic scale defined as follows Let

p p = 10 10glO 0001 aircraftnmi2

Then p is converted into an integer by dropping any digits to the right of the decimal point That integer is then represented by an alphabet-extended decimal system where A = 10 B = 11 C = 12 etc The logarithmic scale is marked in Fig 1 for reference

The counting of aircraft is based on target reports and tracks A tarshyget report which correlates with a track is counted as one aircraft

When the Fig 1 data were recorded the TMF was located at Brea Cali shyfornia on a prominent hilltop radar site about 20 nmi inland from the coast (3396deg N Lat 11791deg W Long 1400 ft elev) This site affords good coverage of the LA Basin including the San Fernando Valley and the San Bernardino region Measurements which assess the coverage of this site are discussed in Section 5

The result~ in Fig 1 indicate that the spatial distribution of traffic is very nonuniform As would be expected densities are much lower over the ocean than over the land and are relatively low over the mountainous region beampinning about 15 nmi north of the TMF Peak density is seen to occur in the Long Beach area Although not as dense as the peak local concentrations are apparent in the Van NuysBurbank area in the OntarioRiverside area and along the coast southeast of LA

Figure 2 shows the range distribution of traffic about the location of maximum density namely (X Y) = (-10 nmi -10 nmi) This plot also includes for comparison two simple mathematical models uniform-in-area and uniformshyin-range Comparisons indicate that within 10 nmi the LA data may be approxshyimately described as uniform-in-area with density of 01 aircraftnmi2 and

2

ATe-so (1)

MEASUREMENT TMF 8126 SUN 21 NOVbull 1976 11 30-11 50 PST

20

middot -C

~ 0

I ~

a o z -20

-~ zgt

-40

~o -40 -20 a 20 40

X(NMI EAST MAGJ

KEY shy SYMBOL

123456789ABCOEFGHIJKLMNOpaRST~ I I I I I I I I I I I I Ii Iii I I I bull I iii Ii i i

0001 001 01 1

TRAFFIC DENSITYP (AIRCRAFTNMJ2)

FigI Traffic density map LA Basin

3

zi a) HISTOGRAM

i ATe-80 ( 2 ) -z N 10 shyX ~ o - ~ ~ ~ ~~ ~ LU - ~~ ~~~ Z - ~~~ ~~~ ~ ~~~~ Z~ ~~ IL - ~~~~~~~~ ~~~~~ ~ ~ f ~~ ~ ~ ~ a - v~~ ~Y~~~~~y~~~~ o a - ~~~~~~~~~~~~~~~~~ ~ -~~~~~~~~~~~~~~~~~~~~ --~

-~~~Y~I~~~~~~~~~~ shyIL ~~~~~~~~~~v~V~~~~~~Y~vv~vvzv~o v~ ~ ~~ ~~ vJ a ~~~~~~~~~~~~~~~~~V ~~v~v~~~~~~~~~~LU ~~~~~~y~Z ~ ~l~~~~~~~~~~~~~~~~~CD ~~v~~ ~ ~ z~~~v~ Vf ~ ~~~~~~~~~~~E o ) z o 10 20 30 40 50 60

RANGE- (NMn

b) CUMULATIVE DISTRIBUTIONa LtJ C Z ~ a 100 TMF 8126X MEASUREMENT ~

~ IL UNIFORM-IN-RANGE MODEL4 a () 3 AIRCRAFTNM a 10 ~ IL o UNIFORM-IN-AREA MODEL a 01 AIRCRAFTNM2 LU CD E )z 1- ~__oIIL-L~ L__a___II_a_L_

2 5 10 20 50 RANGE R (NMn

Fig2 Range distribution of traffic -- LA Basin

4

--

t

~

-

between 10 and 50 nmi the data may be approximately described as uniform-inshyrange with density of 3 aircraftnmi

22 Variation with Time

221 Short-Term Variation

The results shown in Figs 1 and 2 were obtained by averaging over a period of 20 minutes Variations with time throughout that period are plotted in Figs 3 and 4 Figure 3 pertains to the traffic within a range of 10 nmi of the location of highest density and Fig 4 includes all traffic within 80 nmi of the TMF

The amount of variability in aircraft count is shown in Fig 5 in the form of the cumulative distribution and in Fig 6 as the standard deviation It might have been expected that the amount of variability would agree approxshyimately with Poisson statistics In the gas model used to represent air traffic in certain cases the probability distribution of aircraft count within any region is Poisson For a random variable with Poisson distribution the standard deviation is equal to the square root of the average value (Ref 5) This relationship is plotted in Fig 6 for comparison with the data It is evident that the measurements conform to the Poisson law to first order and yet the standard deviation of the measured data is consistently less than this simple rule Possible mechanisms for this difference are (1) the structure of air traffic due to ATC and (2) the shortness of the sample (20 min) which because of the fact that it takes about 10 to 60 minutes for individual aircraft to pass through the counting region generally tends to decrease the standard deviation of the sample relative to the longer term standard deviation

222 Day-to-Day Variation

In order to assess day-to-day variation TMF data tapes recorded on different days were processed Figure 7 shows a comparison of LA Basin results on four different days Although not all identical the results are seen to be similar The primary features mentioned above in connection with tape TMF8l26 (low density over ocean and mountains peak occurring around Long Beach etc) are evident in the other three days traffic as well TMF8l26 recorded on a Sunday exhibits the highest density among these four samples but not by a large factor

The Appendix gives more detailed computer outputs for these four TMF tapes The traffic density map and the range distribution histogram centered at the location of highest density are given for each case

5

40 NUMBER OF AIRCRAFT IN EACH SCAN

30

r-

hVERAGED OVER 40 sec

AVERAGED OVER 120 sec

~

rshylL ltt a u a ltt lL o a w CD ~ J Z

20

10

CENTER POINT RANGE 10 nmi

(-10 -10)

o 50 100 150 200 250 300

SCAN NUMBER

Fig~3 Time variation traffic in the LA area - peak location shy

6

150

I-La 125 lt a U a lt La 0 100

a ILl m ~ ~ Z 75

50 CENTER POINT TMF RANGE 80 nmi

25

l -4-204521_

a 50 100 150 200 250 300

SCAN NUMBER

Fig4 Time variation of traffic in the LA Basin - Total

7

ATC-SO (5)Lt o

TAPE TMF 8128 20 MIN 8AMitlE ~ Lt 100 ---------~-~~-----7__II~____ W-C_ 25middotNMIa-C RANGE-CO() LIMIT g~ Z-CO WI() degOm 50~---------6--+---------4~-G----+---ta--cWI vl~ wzzgt-raquo i=()Oc(ZOJc( 0i ~ 0-----j50a----1-0-0a----1-5-0-------20-0~

raquodeg INSTANTANEOUS NO OF AIRCRAFT

Fig5 Short term variability - Cumulative distribution of aircraft count

ATC-SO (6)

TAPE TMF 8128 20 MIN SAMPLE

o 20 z o ~ ltgt w c 10 c a lt c z LA BASIN lt MEASUREMENTS en

50 100 150 200

AVERAGE NO OF AIRCRAFT n

Fig6 Short term variability - Comparison between mean and standard deviation

8

flgtAIRCRAFT40 9 001 AIRCRAFT

09~ ~ 0 PER nmi2 003 2

0 9 ~~~ PEAK 007 PER nml 20

~ -= o z -20

E c

-40

-60 TMF 8046 TMF 8055 THURS 1630 PST 111176 MON 1230 PST 111576

40

20a 0 ~

0 s

0 ~ -z -20 E c ~ -40

-60 TMF 8122 TMF 8126 SAT 1400 PST 112076 SUN 130 PST 112176

-60 -40 -20 o 20 40 60 -60 -40 -20 o 20 40 60

X lnmi East Mag) X lnmi East Mag)

Fig7 Day-to-day comparison of LA Basin traffic

9

30 TRAFFIC IN OTHER LOCATIONS

Figures 8 9 and 10 present traffic density maps of respectively Washington DC Philadelphia and Boston As in Fig 1 the sYmbols plotted indicate the local density averaged over the region within 10 nmi of each point The Boston data was recorded with the TMF located at Deer Island a favorable site about 2 nmi east of Logan Airport This site was found to give excellent coverage of the airspace around Boston The Philadelphia data was recorded when the TMF was located near Clementon NJ a site about 15 nmi southeast of Philadelphia International Airport also providing excellent coverage

The Washington data in Fig 8 was recorded with the TMF located at Washington National Airport In this case it was found that an excessive number of targets were recorded at close range -- thought to be primarily false targets due to reflections and imperfect sidelobe suppression Because of this condition all targets with ranges less than 2 nmi were deleted prior to the computation of traffic densities This range filtering was done only in the case of the Washington data

Cumulative range distributions N(R) of aircraft plotted in Fig 11 permit comparisons to be made among sites and among different days at each site Each curve gives the range distribution relative to the location of maximum density The curve marked high density traffic model LAl is discussed in the next section

The day-to-day similarities in LA traffic discussed above in connection with Fig 7 are also apparent here with TMF8l26 having the maximum density It is also seen that TMF8l26 exhibits the maximum density among all of the tapes reduced regardless of location The results exhibit a moderate day-to-day repeatability in each location Although the curve shapes in Fig 11 are all similar certain differences may be noted For example N(lO nmi) results at Boston Philadelphia and Washington are all approximately equal and yet N(60 nmi) results exhibit appreciable differences with Philadelphia exceeding Washington and Washington exceeding Boston In other words the traffic density in Boston falls off rapidly away from the location of peak density while Washington and Philadelphia traffic densities falloff less rapidly In all three cases the distribution beyond 10 nmi is moderately well approximately by a uniform-in-range model with 1 to 2 aircraft per nmi (which is considerably less than the 3 aircraft per nmi of LA)

Density map comparisons showing day-to-day repeatability to Washington Philadelphia and Boston are given in Figs 12 13 and 14 Day-to-day changes in spatial distribution are more evident in the Philadelphia plots as compared with the other locations These changes may be the result of the

10

ATe-80 (8)

MEASUREMENT TMF 4039 MON 24 MAY 1976 1114-1134 EDT

- E

J a 0 z

40

20

0

1

1

1

I

s t

J 1 ( J r 1 ~

- -- L 1 Sshy f 4 6 pound J ( f c~~j

I ~ i f

~ ~l l C D I bull A C- 1gt

7 ~

~ 4 45 bull bull ~ ~ 1 1 amp

3 1 I

t 7 s f 1 r 1 f 9

c ~c

bull ~

bull t

8

4shy

3

4shy

J

7

1

z

I

1

~

t

Z 1

~ Z ~

gtshy-20

I t r ( ( ~ sshy f

( ~ S ~

-40 i S

-40 -20 a 20 40 60

X(NMI EAST MAG) KEY -

SYMBOL

123456189ABCDEFGHlJKLMNOPQRST i 11111111 IIIILi iii iii

0001 001 01 1

TRAFFIC DENSITY p (AIRCRAFTINMl2)

Fig8 Traffic density map Washington DC

11

ATe-80 (9)

MEASUREMENT TMF 5026 THURS 24 JUNE 1976 1358-1428 EDTshy

r 7 t bull or r I 7 1 9 q

40

1 z20 3

r r r o

r r r r

Z~

4

3 4

4

-gt -20 ~

r I I

I

7 J 11 I I shy __ - I I

1tN6E ur _ I P~UNIamp--71IIS ~s_ 1

-60 -4Q -20 o 20 40 60

X(NMI EASTMAGJ

KEY shySYMBOL

1234 56789ABCOE FGH IJ KLMNOPQRST 11111111 IIIILI ~I iii bull ~I

0001 001 01 1

TRAFFIC DENSITYp CAIRCRAFTNMI2)

Fig9 Traffic density map Philadelphia

12

ATe-so (10)

MEASUREMENT TMF 3037 MON 29 MARCH1976 1541-1559 EST

I bull

- ~

lt ~

I t-a 0 Z

i z-gtshy

40

20

O

-20

-40

1 r 7

f r 7

~ -f r r 6 I

1 -f 1 ~ 7 if 1

~ ~ ~ 1 ( 1 t

I I 7 7 -A A

I -shy

1 1 8 e 1)

I

1 7 I~

~ bull UJHtN

I IVTAlIshy I

1 7 7 1 ~ 1 p Il shy--------shy7 7 If ~ to ~ ( bull ~--I

11 f7 1 A (

1 ~ A 1 bull 1---

r

f

1

if

bull 6shy

V

l bull Z 1

r z

I z

I

~~c~AFr I yM L I

J I I

I I

z 4 llfmiddot

J l~~

~Ifv1~

-40 -20 0 20 40

XCNMI EAST MAGJ

KEY -SYMBOL

12345678 9ABCDE FGH I J K LMNOPQRS T I I I I I I I I I I I I I l-I i i i V

0001 001 01 1

TRAFFIC DENSITYp (AlRCRAFTNMl2 )

FigIO Traffic density map Boston

13

1000

l18-4-19158 L LA HIGH DENSITY

TRAFFIC MODEL LA

0

W () Z ~ 0

Z I 100 t shy

~

t shy~

~ 0 U Q

ltt ~

o Q W m ~ 10 Z

w () ~ Q W

~

1 _---_--1_6---1-- shy

201052

RANGE R (nmi)

Fig11 Traffic distributions

bull J

6-----

50 100

in range

14

(

CI ~ ~

~

=E ~

IL 0 z ~ a ~

E c

gtshy

Ishy

Fig12

40

20

0

-40 TMF 4001 THURS MAY 6 1976

40

20

-20

-40

40

20

TMF 4045 FRI MAY 28 1976

-60 -40 -20

-40

-20

C42-1705

1600 EDT

40

1300 EDT

0 20 40 60

x (nmi EAST OF TMF MAG)

Day-to-day comparison of Washington traffic

15

C42-1706

40

20

O~---+---++W---------i

-20 )

TMF 5005 -40 TUES JUNE 15 1976 1000 EDT

C)

lt 4i

u i 0 ~

I a 0 z E c

~

40

20

O~---f--l~_~----------l

-20

-40

x (nml EAST OF TMF MAG)

Fig 13 Day-to-day comparison of Philadelphia traffic

16

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

-~Z 30 I- shyf shy

-~ lL ltX f- - shya U a lti I- shy

lL 20 ~ I--

shyo a -- f-_ w -00 ~ -I shy -shyJ shyZ

I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

-1-4-20460 shy

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50

o

f shy

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I 1 3 t 3 1 1

1 3 t 6 7 5 3 3 2 5 t 5 7 A A A 9 6 I 6

6 9 8 C 0 C A 6 3 5 7 C C E F E 0 8 9 8 C

2 7 9 C E G G G F 0 0 0 E 5 8 8 o E F G H G E E F F 7 9 Il euro --iH-6 II 6 amp--shy7 8 9 8 8 0 F G H I I I I 5 7 8 8 8 9 8 F H I J J J I 3 I I 3 2 3 C F r J J J

9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

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6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

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1 1 I 3 6 7 6 3 1 I

I ~

-

-

-

-

- -

-100

I I

-50 I

o I I

50

I

taO

X (nmi East 1 Mag)

FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

E

c CJ

7 ~ shyI I shyU ~

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6 l- shy l shylJ I shyltt a

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z ~ - - shy

3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

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FigA-3 LA map TMF8122

A-5

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FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

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FigA-5 LA map TMF8046

A-7

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FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

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FigA-7 LA map TMF8055

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FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

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- FigA-9 Washington map TMF4039

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FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

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0 Ol

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Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

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X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

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FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

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-25

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1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

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X (nmi East Mag)

FigA-I3 Washington map TMF4054

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FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

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1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

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X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

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FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

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2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

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x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

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FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

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bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

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FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

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bull

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bull bull

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Fig A-25 Boston map TMF3008

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ll-~

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bull FigA-26 Boston histogram TMF3008

A-28

Fig No

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

A-I

A-2

A-3

A-4

A-5

LIST OF ILLUSTRATIONS

Traffic Density Map LA Basin

Range Distribution of Traffic -- LA Basin bull

Time Variation Traffic in the LA Area - Peak Location

Time Variation of Traffic in the LA Basin - Total

Short Term Variability - Cumulative Distribution of Aircraft Count bull bull bull

Short Term Variability - Comparison Between Mean and Standard Deviation bull

Day-to-Day Comparison of LA Basin Traffic

Traffic Density Map Washington DC

Traffic Density Map Philadelphia

Traffic Density Map Boston bull

Traffic Distributions in Range

Day-to-Day Comparison of Washington Traffic

Day-to-Day Comparison of Philadelphia Traffic Day-to-Day Comparison of Boston Traffic Traffic Density Map LAI Traffic Model

Range Distribution Histogram for the LAI Traffic Model

Time Variation LAI Traffic Model

Comparison Between LAl Traffic Model and TMF Measurement

X-Y Plot of Aircraft Tracks (LA Basin)

Comparison Between TMF and ARTS as the Source of Traffic Density Data - Washington DCbullbull

Comparison Between TMF and ARTS as the Source of Traffic Data - Boston bull

LA Map TMF8l26

LA Histogram TMF8l26

LA Mpa TMF8l22 bull bull

LA Histogram TMF8l22

LA Map TMF8046

Page

3

4

6

7

8

8

9

11

12

13

14

15

16

17

20

21

22

23

25

27

-J 28

A-3

A-If

A-5

A-6

A-7

ii

Fig No

A-6

A-7

A-8

A-9

A-IO

A-II

A-12

A-13

A-14

A-15

A-16

A-17

A-18

A-19

A-20

A-21

A-22

A-23

A-24

A-25

A-26

(shy

LIST OF ILLUSTRATIONS (Continued)

LA Histogram TMF8046 A-8

LA Map TMF8055 A-9

LA Histogram TMF8055 A-IO

Washington Map TMF4039 A-II

Washington Histogram TMF4039 A-12

Washington Map TMF4001 A-13

Washington Histogram TMF4001 A-14

Washington Map TMF4054 A-15

Washington Histogram TMF4054 A-16

Philadelphia Map TMF5139 A-17

Philadelphia Histogram TMF5139 A-18

Philadelphia Map TMF5026 A-19

Philadelphia Histogram TMF5026 A-20

Philadelphia Map TMF5005 A-21

Philadelphia Histogram TMF5005 A-22

Boston Map TMF3031 A-23

Boston Histogram TMF3031 A-24

Boston Map TMF3037 A-25

Boston Histogram TMF3037 A-26

Boston Map TMF3008 A-27

Boston Histogram TMF3008 bull A-28

iii

10 INTRODUCTION

This report summarizes the results of a study to determine air traffic densities at several important locations in the United States This type of information is needed in the development of air traffic control systems such as DABS and BCAS The design and evaluation of these systems depend on traffic density in several ways computer track files must be large enough to accomshymodate all of the traffic encountered and the tolerance to interference must be sufficient to permit undegraded operation even in the presence of the high levels of interference which are to be expected in high traffic density

bull This report presents the results of measurements made in 1976 to determine

the peak air traffic density its spatial distribution and its variation with time for transponder equipped aircraft in the Los Angeles area and at several locations on the East Coast

The primary facility used for these measurements was the MIT Lincoln Laboratory Transportable Measurements Facility (TMF Ref 3) The TMF was originally built and operated for the purpose of testing the design of DABS in realistic air traffic environments During these tests it was found that the quality of the TMF surveillance data was markedly superior to that of the data produced by the currently operational ATCRBS equipment Aircraft tracks in TMF were seen to be more uniform and regular having significantly fewer missed reports and having significantly improved range and azimuth accuracies (Ref 4) For this reason TMF data was used in this traffic density analysis

Discrete ddress ~eacon ~ystem (Ref 1) ~eacon Collision Avoidance ~ystem

(Ref 2)

Air Traffic Control Radar Beacon ~ystem

1

20 TRAFFIC IN THE LA BASIN

The Los Angeles Basin is reputed to have the highest traffic density in the United States As a result there is considerable interest in current LA traffic measurements

21 Spatial Distribution

Figure 1 shows a traffic density map of the LA Basin These results were obtained from a 20 minute recording of TMF data in November 1976 Each alphashynumeric symbol represents the time average of the traffic density within 10 nmi of that location That is the aircraft located within a circle of radius R = 10 nmi were counted and that count averaged over the duration of the sample (here 20 min) this average count was then divided by the area nR2 to obtain a density p in aircraft per nmi 2 The result is shown via a logarithmic scale defined as follows Let

p p = 10 10glO 0001 aircraftnmi2

Then p is converted into an integer by dropping any digits to the right of the decimal point That integer is then represented by an alphabet-extended decimal system where A = 10 B = 11 C = 12 etc The logarithmic scale is marked in Fig 1 for reference

The counting of aircraft is based on target reports and tracks A tarshyget report which correlates with a track is counted as one aircraft

When the Fig 1 data were recorded the TMF was located at Brea Cali shyfornia on a prominent hilltop radar site about 20 nmi inland from the coast (3396deg N Lat 11791deg W Long 1400 ft elev) This site affords good coverage of the LA Basin including the San Fernando Valley and the San Bernardino region Measurements which assess the coverage of this site are discussed in Section 5

The result~ in Fig 1 indicate that the spatial distribution of traffic is very nonuniform As would be expected densities are much lower over the ocean than over the land and are relatively low over the mountainous region beampinning about 15 nmi north of the TMF Peak density is seen to occur in the Long Beach area Although not as dense as the peak local concentrations are apparent in the Van NuysBurbank area in the OntarioRiverside area and along the coast southeast of LA

Figure 2 shows the range distribution of traffic about the location of maximum density namely (X Y) = (-10 nmi -10 nmi) This plot also includes for comparison two simple mathematical models uniform-in-area and uniformshyin-range Comparisons indicate that within 10 nmi the LA data may be approxshyimately described as uniform-in-area with density of 01 aircraftnmi2 and

2

ATe-so (1)

MEASUREMENT TMF 8126 SUN 21 NOVbull 1976 11 30-11 50 PST

20

middot -C

~ 0

I ~

a o z -20

-~ zgt

-40

~o -40 -20 a 20 40

X(NMI EAST MAGJ

KEY shy SYMBOL

123456789ABCOEFGHIJKLMNOpaRST~ I I I I I I I I I I I I Ii Iii I I I bull I iii Ii i i

0001 001 01 1

TRAFFIC DENSITYP (AIRCRAFTNMJ2)

FigI Traffic density map LA Basin

3

zi a) HISTOGRAM

i ATe-80 ( 2 ) -z N 10 shyX ~ o - ~ ~ ~ ~~ ~ LU - ~~ ~~~ Z - ~~~ ~~~ ~ ~~~~ Z~ ~~ IL - ~~~~~~~~ ~~~~~ ~ ~ f ~~ ~ ~ ~ a - v~~ ~Y~~~~~y~~~~ o a - ~~~~~~~~~~~~~~~~~ ~ -~~~~~~~~~~~~~~~~~~~~ --~

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RANGE- (NMn

b) CUMULATIVE DISTRIBUTIONa LtJ C Z ~ a 100 TMF 8126X MEASUREMENT ~

~ IL UNIFORM-IN-RANGE MODEL4 a () 3 AIRCRAFTNM a 10 ~ IL o UNIFORM-IN-AREA MODEL a 01 AIRCRAFTNM2 LU CD E )z 1- ~__oIIL-L~ L__a___II_a_L_

2 5 10 20 50 RANGE R (NMn

Fig2 Range distribution of traffic -- LA Basin

4

--

t

~

-

between 10 and 50 nmi the data may be approximately described as uniform-inshyrange with density of 3 aircraftnmi

22 Variation with Time

221 Short-Term Variation

The results shown in Figs 1 and 2 were obtained by averaging over a period of 20 minutes Variations with time throughout that period are plotted in Figs 3 and 4 Figure 3 pertains to the traffic within a range of 10 nmi of the location of highest density and Fig 4 includes all traffic within 80 nmi of the TMF

The amount of variability in aircraft count is shown in Fig 5 in the form of the cumulative distribution and in Fig 6 as the standard deviation It might have been expected that the amount of variability would agree approxshyimately with Poisson statistics In the gas model used to represent air traffic in certain cases the probability distribution of aircraft count within any region is Poisson For a random variable with Poisson distribution the standard deviation is equal to the square root of the average value (Ref 5) This relationship is plotted in Fig 6 for comparison with the data It is evident that the measurements conform to the Poisson law to first order and yet the standard deviation of the measured data is consistently less than this simple rule Possible mechanisms for this difference are (1) the structure of air traffic due to ATC and (2) the shortness of the sample (20 min) which because of the fact that it takes about 10 to 60 minutes for individual aircraft to pass through the counting region generally tends to decrease the standard deviation of the sample relative to the longer term standard deviation

222 Day-to-Day Variation

In order to assess day-to-day variation TMF data tapes recorded on different days were processed Figure 7 shows a comparison of LA Basin results on four different days Although not all identical the results are seen to be similar The primary features mentioned above in connection with tape TMF8l26 (low density over ocean and mountains peak occurring around Long Beach etc) are evident in the other three days traffic as well TMF8l26 recorded on a Sunday exhibits the highest density among these four samples but not by a large factor

The Appendix gives more detailed computer outputs for these four TMF tapes The traffic density map and the range distribution histogram centered at the location of highest density are given for each case

5

40 NUMBER OF AIRCRAFT IN EACH SCAN

30

r-

hVERAGED OVER 40 sec

AVERAGED OVER 120 sec

~

rshylL ltt a u a ltt lL o a w CD ~ J Z

20

10

CENTER POINT RANGE 10 nmi

(-10 -10)

o 50 100 150 200 250 300

SCAN NUMBER

Fig~3 Time variation traffic in the LA area - peak location shy

6

150

I-La 125 lt a U a lt La 0 100

a ILl m ~ ~ Z 75

50 CENTER POINT TMF RANGE 80 nmi

25

l -4-204521_

a 50 100 150 200 250 300

SCAN NUMBER

Fig4 Time variation of traffic in the LA Basin - Total

7

ATC-SO (5)Lt o

TAPE TMF 8128 20 MIN 8AMitlE ~ Lt 100 ---------~-~~-----7__II~____ W-C_ 25middotNMIa-C RANGE-CO() LIMIT g~ Z-CO WI() degOm 50~---------6--+---------4~-G----+---ta--cWI vl~ wzzgt-raquo i=()Oc(ZOJc( 0i ~ 0-----j50a----1-0-0a----1-5-0-------20-0~

raquodeg INSTANTANEOUS NO OF AIRCRAFT

Fig5 Short term variability - Cumulative distribution of aircraft count

ATC-SO (6)

TAPE TMF 8128 20 MIN SAMPLE

o 20 z o ~ ltgt w c 10 c a lt c z LA BASIN lt MEASUREMENTS en

50 100 150 200

AVERAGE NO OF AIRCRAFT n

Fig6 Short term variability - Comparison between mean and standard deviation

8

flgtAIRCRAFT40 9 001 AIRCRAFT

09~ ~ 0 PER nmi2 003 2

0 9 ~~~ PEAK 007 PER nml 20

~ -= o z -20

E c

-40

-60 TMF 8046 TMF 8055 THURS 1630 PST 111176 MON 1230 PST 111576

40

20a 0 ~

0 s

0 ~ -z -20 E c ~ -40

-60 TMF 8122 TMF 8126 SAT 1400 PST 112076 SUN 130 PST 112176

-60 -40 -20 o 20 40 60 -60 -40 -20 o 20 40 60

X lnmi East Mag) X lnmi East Mag)

Fig7 Day-to-day comparison of LA Basin traffic

9

30 TRAFFIC IN OTHER LOCATIONS

Figures 8 9 and 10 present traffic density maps of respectively Washington DC Philadelphia and Boston As in Fig 1 the sYmbols plotted indicate the local density averaged over the region within 10 nmi of each point The Boston data was recorded with the TMF located at Deer Island a favorable site about 2 nmi east of Logan Airport This site was found to give excellent coverage of the airspace around Boston The Philadelphia data was recorded when the TMF was located near Clementon NJ a site about 15 nmi southeast of Philadelphia International Airport also providing excellent coverage

The Washington data in Fig 8 was recorded with the TMF located at Washington National Airport In this case it was found that an excessive number of targets were recorded at close range -- thought to be primarily false targets due to reflections and imperfect sidelobe suppression Because of this condition all targets with ranges less than 2 nmi were deleted prior to the computation of traffic densities This range filtering was done only in the case of the Washington data

Cumulative range distributions N(R) of aircraft plotted in Fig 11 permit comparisons to be made among sites and among different days at each site Each curve gives the range distribution relative to the location of maximum density The curve marked high density traffic model LAl is discussed in the next section

The day-to-day similarities in LA traffic discussed above in connection with Fig 7 are also apparent here with TMF8l26 having the maximum density It is also seen that TMF8l26 exhibits the maximum density among all of the tapes reduced regardless of location The results exhibit a moderate day-to-day repeatability in each location Although the curve shapes in Fig 11 are all similar certain differences may be noted For example N(lO nmi) results at Boston Philadelphia and Washington are all approximately equal and yet N(60 nmi) results exhibit appreciable differences with Philadelphia exceeding Washington and Washington exceeding Boston In other words the traffic density in Boston falls off rapidly away from the location of peak density while Washington and Philadelphia traffic densities falloff less rapidly In all three cases the distribution beyond 10 nmi is moderately well approximately by a uniform-in-range model with 1 to 2 aircraft per nmi (which is considerably less than the 3 aircraft per nmi of LA)

Density map comparisons showing day-to-day repeatability to Washington Philadelphia and Boston are given in Figs 12 13 and 14 Day-to-day changes in spatial distribution are more evident in the Philadelphia plots as compared with the other locations These changes may be the result of the

10

ATe-80 (8)

MEASUREMENT TMF 4039 MON 24 MAY 1976 1114-1134 EDT

- E

J a 0 z

40

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0

1

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SYMBOL

123456189ABCDEFGHlJKLMNOPQRST i 11111111 IIIILi iii iii

0001 001 01 1

TRAFFIC DENSITY p (AIRCRAFTINMl2)

Fig8 Traffic density map Washington DC

11

ATe-80 (9)

MEASUREMENT TMF 5026 THURS 24 JUNE 1976 1358-1428 EDTshy

r 7 t bull or r I 7 1 9 q

40

1 z20 3

r r r o

r r r r

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KEY shySYMBOL

1234 56789ABCOE FGH IJ KLMNOPQRST 11111111 IIIILI ~I iii bull ~I

0001 001 01 1

TRAFFIC DENSITYp CAIRCRAFTNMI2)

Fig9 Traffic density map Philadelphia

12

ATe-so (10)

MEASUREMENT TMF 3037 MON 29 MARCH1976 1541-1559 EST

I bull

- ~

lt ~

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40

20

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FigIO Traffic density map Boston

13

1000

l18-4-19158 L LA HIGH DENSITY

TRAFFIC MODEL LA

0

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bull J

6-----

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14

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40

20

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-40

40

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TMF 4045 FRI MAY 28 1976

-60 -40 -20

-40

-20

C42-1705

1600 EDT

40

1300 EDT

0 20 40 60

x (nmi EAST OF TMF MAG)

Day-to-day comparison of Washington traffic

15

C42-1706

40

20

O~---+---++W---------i

-20 )

TMF 5005 -40 TUES JUNE 15 1976 1000 EDT

C)

lt 4i

u i 0 ~

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20

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Fig 13 Day-to-day comparison of Philadelphia traffic

16

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

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Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

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350300

SCAN NUMBER

~ ~ -~-I-I

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400 ~ -I ~ -ItJ

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HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

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X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

-1-4-20460 shy

fshy -

-50

~

cshy o Z

E c

50

o

f shy

~

I

2

I

I I

I 1 3 t 3 1 1

1 3 t 6 7 5 3 3 2 5 t 5 7 A A A 9 6 I 6

6 9 8 C 0 C A 6 3 5 7 C C E F E 0 8 9 8 C

2 7 9 C E G G G F 0 0 0 E 5 8 8 o E F G H G E E F F 7 9 Il euro --iH-6 II 6 amp--shy7 8 9 8 8 0 F G H I I I I 5 7 8 8 8 9 8 F H I J J J I 3 I I 3 2 3 C F r J J J

9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

I 5 6 5 2 3 3 2

I

I I I 2 I

I 2 3 2 I 2 2 2 t t 3 2

2 2 3 t ~ 6 r 2 2 2 3 3 5 6 D t I

6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

6 F F E [)-euro-- euro--iHt-amp---tr--6--tr-4 H G F E C C A A 9 7 6 6 6 6 I

I H l 0 8 A987t3t31 H G F C A 66132 G F E C 9 I 232 0 0 C C 8 9 7 2 ~ 5 I

9 8 C C C 8 A 8 7 7 6 t

5 8 A C C C 8 8 A 8 8 6 1

6 7 9 8 C C 8 A 9 8 6 t

1 3 5 6 7 9 8 8 B B 7 6 I

3 I 6 9 B B 9 8 5 3 3 5 7 9 9 9 6 3

1 1 I 3 6 7 6 3 1 I

I ~

-

-

-

-

- -

-100

I I

-50 I

o I I

50

I

taO

X (nmi East 1 Mag)

FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

E

c CJ

7 ~ shyI I shyU ~

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W CD

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z ~ - - shy

3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

2 If 6 888 8 C C 9 6 t 3 If A C 0 o C 8 8 It 8 8 7 6 6 6 If

2 t 7 9 888 DEE C A A It 8 E F F F 0 C 8 A A A 9 7 7 6 If 2 rshy~

o Z

0

2 5 8 9 ABC 0 E F FED 0 o E 379 A ceo 0 E F G G F G F F- - - - -

If 8 9 9 Ace 0 F F H H H H H

G G G G E 0 B A A A 9 9 8 7 5 G H G F E C A B 8 A 9 8 8 6 5

- r v bull v

H G FEe C A A 9 7 656 5 5

2

E c-

2 6 8 8 A A 8 C E G H I I 3lf5776AE G H I

I I

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H F C 8 899 7 6 2 1 If H G C 9 776 2

If

1 3

1 2 1 8 E F G H H GEe 9 5 5 2 gt- - 25 - 3 A C C 0 F E 0 C It A 8 5 5 5 2 -

5 8 8 7 A B 888 A A 9 7 6 3 If 6 6 1 6 9 A 8 8 8 A 8 5 1 2 5 If 1 1 2 7 A 8 B 8 8 5 2

2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

~7 shy

r-

t- ~~

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lti r shy

~

0 ~

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~

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4 shyz fshy -

rshy

-1--shy~ -

I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

75

I 2 2 I 3 J 2

2 + + 3 2 50 2 5 5 At J

I 3 2 I 2 + 5 5 5 2 3 At At At 3 + 5 Igt 5 + 1 1

I 3 5 6 6 7 Igt 8 5 5 3 I 2 3 2 1 2 3 At 6 8 8 8 1 2 Igt 8 8 l 2 I I + J I

25 I 2 2 5 A B A 1 Igt 1 7 1 5 5 6 Igt 5 3 1 2 3 3 1 CO D I I I At 8 A C C 8 8 + 3 I A 8 8 8 A 8 1 5 5 Igt 8 7 7 5 2 2 2 3 6 9 B C E E 0 C 9 8 A 0 0 0 0 8 A 1 Igt 1 1 8 8 7 5 2 ~ 2 At It 6 8 A C E F F F E 0 C C E F E 0 A 9 Igt Igt 7 7 7 7 5 1 ~ 0 Z

a 2 It

It

5

6

6

7

8

8

8

9

B C E F H I H GEE -++-t-j-fmiddot-~ oF-

A B C F H r J I H G

F FEe 8 9-9- f Dell a 8 9

8

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7

9

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7

8

6

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3

9 A A D G I I r I 4

7 8 9 9 0 G H H 11

66669CE G 2 + At + 7 9 A A C 0

G E C 1 G E f A

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9 I

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8

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5

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5 5

5 5 + 3

3 3 2 2

I 3 + 5 1 9 9 9 8 A II A A II A 9 7 5 5 5 + I I I 3 + 5 7 8 8 9 8 r 889 A A ~ 8 8 7 5 1

2 3 3 + 6 Igt Igt 7 8 9 8 5 2 l 1 9 A A 9 7 5 I

2 3 3 57768A4 A I J 5 9 A 8 1 5

-50 2 3 I

3 5 2

Igt 5 1

7 Igt

7 5 5

7 1

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9 9

8

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9

A

B

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8

1

8

5

1 J 5

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If

6 b

(I A II

7 9

A II

9

9 7

9 7 t

6 1

I + 5 5 Igt 7 II 8 7 7 b b 7 Igt It

I J J I b b i) b b b 5 J -75 1 3 + 5 I 1

I I 2

~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

-

7 CENTERPOINT -20 nmi -5 nmi -

6 - -rshylL

r shy _

lt -0 U 0 5 - -lt

lL _ r-

o -0 W 4 - -CD ~ ~ r-

z -

shy--

2 fshy -- -

rshy -

1-shyI--~-

-

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

Ishy

~-

t -75

-50

25

gt- -25

r-o 0 z

E c

1

1 1 2

A bull amp

1

2 2 2 1 If

2

2 2 2 2 4f

If bull

2

1

3 2 4f

5 1 V

4f

3

1 2 2 5 5 1 8 A V

6 If 2

1 2 1 1 3 3 2 2 1 7 3 2 2 2 2 5 6 6 5 3 1 6 7 7 3 2 3 2 2 1 6 8 9 9 8 4f 1 6 6 7 3 5 4f 4f 4f 1 1 7 9 B B A 8 poundf 2 3 At 9 7 8 8 8 6 6 At 4f 5 6 7 8 A C 0 C B 9 8 A A C 0 C 8 B 9 8 1 1 1 1 8 9 B C 0 0 0 0 C C 0 E E E o D B A 9 8 1 1 1 9 A C E F F E 0 E E F F E E 0 C 8 A 8 1 6 6 A - - shy - r _ A

V V V V

1 8 B E F G G G G G o C C B B 8 A 9 1 5 3 3 5 6 8 C F G G H H H G F 0 C 8 8 A 9 1 At 2 1 3 If 5 9 0 F G H H I H G F C C 8 9 8 6 3 2 L 3 6 A C E F Ii H H G E C 8 A 9 1 6 3

2 2 It 7 9 8 C 0 E F F 0 C B A 9 9 7 6 1 2 3 If 6 7 7 8 9 C C B A A B A A 8 7 5

1 2 If 5 6 6 7 7 8 8 9 9 A A 8 8 A 9 5 1 1 2 5 5 6 6 6 7 7 7 1 9 A 8 8 B 8 3

3 It If It At At If 5 5 6 8 A A A 9 3 1 2 2 2 2 1 2 3 t 6 8 A A 8 t

2 t 6 9 8 A 8 5 1 I 3 3 3 8 9 9 A 7 At

I 1 3 It t 1 1 8 8 3 1 2 3 If 2 1 5 6

I 1 1

7 8 7 7

3

5 6 6

5

2

3 At

4f 3 ~

1

1 1

-

-

-

-

I I I J I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-7 LA map TMF8055

A-9

- -

8 I I r- r J I I I

--4-20467 L ~7 shy

I shy

I- CENTERPOINT -5 nmi -15 nmi _6 ~

f shy

~shy 5 shy

IJ I- shyltX ~

n u I shyn

I shyltX r- r shy

~ ~- shyIJ o

l- f shy0 W CD ~ ~ ~ ~ z 3 - - shy

-rshy

~ f-f- shy2 - shy

-f- shy

~ ~-~ -I shy

- nTh+-_ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

2 3 3 6 1 881 665 6 6 6 6 It 1 1 3 5 6 1 8 9 981 888 8 1 1 6 ~

1 1 1 3 5 8 A 8 8 988 999 9 1 5 3 1 1 3 3 1 1 3 5 6 9 8 C D 989 A A 9 8 5 2 3 3 3 2

25 - 1 3 5 5 2 2 3 6 9 C o U A 9 A A 8 9 6 If 2 3 4f It 3 -1 3 5 5 6 5 1 A C o 0 888 889 6 If It 2

5 6 5 6 A 0 f E 0 C 8 C C 8 9 6 5 5 5 3 1 ~ 2 If 5 5 1 C E F F E o C 8 8 8 9 1 5 5 3 3 2

Lshy~

o z

0 1 1 12236 8 0 F F F E shy bull v

1 1 8 A A C 0 0 o 0

E 0 8 8 A A 1 5 - ~ v v

E C C 9 8 8 If

3 3 If If 2

3 1

2

E c

1 9 A A b B B 8 8 3 1 8 J 9 A A 9 9 A

0 C B 7 6 33 3 2 1 B A 8 6 3 2 3 3 2

gt- -25 - 3 5 6 7 8 9 8 9 9 1 2 5 5 6 1 1 8 8 8

A 9 2 1 5 2 1 2

1 2 2 2 1 3 3 3 2 1 -

5 6 6 5 5 6 7 1 1 6 222 2 3 3 3 2 1 3 5 6 6 6 5 5 5 5 5 If 3 1 122 3 3 2 1 3 5 6 6 5 5 3 If If 2 1 1 2 1 1 2 5 2 1 If 3 3 2 1 122 1

-50 - 1 233 3 2 1 222 1 -223 If 2 1 1 12 3 1 t

2 3 3 1 1 2 1

-75 ~ -

I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

35 ~ shy

I-r-

rshy -~ IJ 30 ~ shylaquo -a r-u shy -a laquo ~- shyIJ 25 l- I- I- shy0 -a - lshyw CD 20 I- shygt ~

-rshyz ~

- -15 - -~ ~ shyrshy

1-shy

r- 0 shy

rshy

-- -05 shy- Ishy

-

mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

~ 1 If 5 6 6 6 9 A B 0 0 0 lt- C B 9 7 5 If

2 3 5 6 6 7 8 A C 0 0 E 0 C B B A 9 7 5 1s ~

2 If If 5 6 7 9 A C 0 E o C 8 A A A 962 ~ o _0 3 5 6 -+-6--amp--e-9--fr~- ~--i---9--8-8 ~ ~ ~ ~ ~

Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

-50 - 332 -shy2 1

-75 1 - shy

1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

~25 shy

Ishy

Ishy~~ 20 shy

0 U Ishy0

r shyltt Ishy

lL ~o I-shylshy

~ Ishyffi 5 shyf-CD

~ gt z

- 0 shy-

05 shy

Ishy

~

h I I I o

10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

~

1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

1 3

1 1 2 2 2

1 3 3 3 3 1 3 2 If If 3 3 2 6 6 6 5 If 3 2

8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

-

--

-

-75 ~

--

-

1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

~

-shyz

10 ~ shy-

05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

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FigA-16 Philadelphia histogram TMF5I39

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l-4-20476middotL

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bull FigA-26 Boston histogram TMF3008

A-28

Fig No

A-6

A-7

A-8

A-9

A-IO

A-II

A-12

A-13

A-14

A-15

A-16

A-17

A-18

A-19

A-20

A-21

A-22

A-23

A-24

A-25

A-26

(shy

LIST OF ILLUSTRATIONS (Continued)

LA Histogram TMF8046 A-8

LA Map TMF8055 A-9

LA Histogram TMF8055 A-IO

Washington Map TMF4039 A-II

Washington Histogram TMF4039 A-12

Washington Map TMF4001 A-13

Washington Histogram TMF4001 A-14

Washington Map TMF4054 A-15

Washington Histogram TMF4054 A-16

Philadelphia Map TMF5139 A-17

Philadelphia Histogram TMF5139 A-18

Philadelphia Map TMF5026 A-19

Philadelphia Histogram TMF5026 A-20

Philadelphia Map TMF5005 A-21

Philadelphia Histogram TMF5005 A-22

Boston Map TMF3031 A-23

Boston Histogram TMF3031 A-24

Boston Map TMF3037 A-25

Boston Histogram TMF3037 A-26

Boston Map TMF3008 A-27

Boston Histogram TMF3008 bull A-28

iii

10 INTRODUCTION

This report summarizes the results of a study to determine air traffic densities at several important locations in the United States This type of information is needed in the development of air traffic control systems such as DABS and BCAS The design and evaluation of these systems depend on traffic density in several ways computer track files must be large enough to accomshymodate all of the traffic encountered and the tolerance to interference must be sufficient to permit undegraded operation even in the presence of the high levels of interference which are to be expected in high traffic density

bull This report presents the results of measurements made in 1976 to determine

the peak air traffic density its spatial distribution and its variation with time for transponder equipped aircraft in the Los Angeles area and at several locations on the East Coast

The primary facility used for these measurements was the MIT Lincoln Laboratory Transportable Measurements Facility (TMF Ref 3) The TMF was originally built and operated for the purpose of testing the design of DABS in realistic air traffic environments During these tests it was found that the quality of the TMF surveillance data was markedly superior to that of the data produced by the currently operational ATCRBS equipment Aircraft tracks in TMF were seen to be more uniform and regular having significantly fewer missed reports and having significantly improved range and azimuth accuracies (Ref 4) For this reason TMF data was used in this traffic density analysis

Discrete ddress ~eacon ~ystem (Ref 1) ~eacon Collision Avoidance ~ystem

(Ref 2)

Air Traffic Control Radar Beacon ~ystem

1

20 TRAFFIC IN THE LA BASIN

The Los Angeles Basin is reputed to have the highest traffic density in the United States As a result there is considerable interest in current LA traffic measurements

21 Spatial Distribution

Figure 1 shows a traffic density map of the LA Basin These results were obtained from a 20 minute recording of TMF data in November 1976 Each alphashynumeric symbol represents the time average of the traffic density within 10 nmi of that location That is the aircraft located within a circle of radius R = 10 nmi were counted and that count averaged over the duration of the sample (here 20 min) this average count was then divided by the area nR2 to obtain a density p in aircraft per nmi 2 The result is shown via a logarithmic scale defined as follows Let

p p = 10 10glO 0001 aircraftnmi2

Then p is converted into an integer by dropping any digits to the right of the decimal point That integer is then represented by an alphabet-extended decimal system where A = 10 B = 11 C = 12 etc The logarithmic scale is marked in Fig 1 for reference

The counting of aircraft is based on target reports and tracks A tarshyget report which correlates with a track is counted as one aircraft

When the Fig 1 data were recorded the TMF was located at Brea Cali shyfornia on a prominent hilltop radar site about 20 nmi inland from the coast (3396deg N Lat 11791deg W Long 1400 ft elev) This site affords good coverage of the LA Basin including the San Fernando Valley and the San Bernardino region Measurements which assess the coverage of this site are discussed in Section 5

The result~ in Fig 1 indicate that the spatial distribution of traffic is very nonuniform As would be expected densities are much lower over the ocean than over the land and are relatively low over the mountainous region beampinning about 15 nmi north of the TMF Peak density is seen to occur in the Long Beach area Although not as dense as the peak local concentrations are apparent in the Van NuysBurbank area in the OntarioRiverside area and along the coast southeast of LA

Figure 2 shows the range distribution of traffic about the location of maximum density namely (X Y) = (-10 nmi -10 nmi) This plot also includes for comparison two simple mathematical models uniform-in-area and uniformshyin-range Comparisons indicate that within 10 nmi the LA data may be approxshyimately described as uniform-in-area with density of 01 aircraftnmi2 and

2

ATe-so (1)

MEASUREMENT TMF 8126 SUN 21 NOVbull 1976 11 30-11 50 PST

20

middot -C

~ 0

I ~

a o z -20

-~ zgt

-40

~o -40 -20 a 20 40

X(NMI EAST MAGJ

KEY shy SYMBOL

123456789ABCOEFGHIJKLMNOpaRST~ I I I I I I I I I I I I Ii Iii I I I bull I iii Ii i i

0001 001 01 1

TRAFFIC DENSITYP (AIRCRAFTNMJ2)

FigI Traffic density map LA Basin

3

zi a) HISTOGRAM

i ATe-80 ( 2 ) -z N 10 shyX ~ o - ~ ~ ~ ~~ ~ LU - ~~ ~~~ Z - ~~~ ~~~ ~ ~~~~ Z~ ~~ IL - ~~~~~~~~ ~~~~~ ~ ~ f ~~ ~ ~ ~ a - v~~ ~Y~~~~~y~~~~ o a - ~~~~~~~~~~~~~~~~~ ~ -~~~~~~~~~~~~~~~~~~~~ --~

-~~~Y~I~~~~~~~~~~ shyIL ~~~~~~~~~~v~V~~~~~~Y~vv~vvzv~o v~ ~ ~~ ~~ vJ a ~~~~~~~~~~~~~~~~~V ~~v~v~~~~~~~~~~LU ~~~~~~y~Z ~ ~l~~~~~~~~~~~~~~~~~CD ~~v~~ ~ ~ z~~~v~ Vf ~ ~~~~~~~~~~~E o ) z o 10 20 30 40 50 60

RANGE- (NMn

b) CUMULATIVE DISTRIBUTIONa LtJ C Z ~ a 100 TMF 8126X MEASUREMENT ~

~ IL UNIFORM-IN-RANGE MODEL4 a () 3 AIRCRAFTNM a 10 ~ IL o UNIFORM-IN-AREA MODEL a 01 AIRCRAFTNM2 LU CD E )z 1- ~__oIIL-L~ L__a___II_a_L_

2 5 10 20 50 RANGE R (NMn

Fig2 Range distribution of traffic -- LA Basin

4

--

t

~

-

between 10 and 50 nmi the data may be approximately described as uniform-inshyrange with density of 3 aircraftnmi

22 Variation with Time

221 Short-Term Variation

The results shown in Figs 1 and 2 were obtained by averaging over a period of 20 minutes Variations with time throughout that period are plotted in Figs 3 and 4 Figure 3 pertains to the traffic within a range of 10 nmi of the location of highest density and Fig 4 includes all traffic within 80 nmi of the TMF

The amount of variability in aircraft count is shown in Fig 5 in the form of the cumulative distribution and in Fig 6 as the standard deviation It might have been expected that the amount of variability would agree approxshyimately with Poisson statistics In the gas model used to represent air traffic in certain cases the probability distribution of aircraft count within any region is Poisson For a random variable with Poisson distribution the standard deviation is equal to the square root of the average value (Ref 5) This relationship is plotted in Fig 6 for comparison with the data It is evident that the measurements conform to the Poisson law to first order and yet the standard deviation of the measured data is consistently less than this simple rule Possible mechanisms for this difference are (1) the structure of air traffic due to ATC and (2) the shortness of the sample (20 min) which because of the fact that it takes about 10 to 60 minutes for individual aircraft to pass through the counting region generally tends to decrease the standard deviation of the sample relative to the longer term standard deviation

222 Day-to-Day Variation

In order to assess day-to-day variation TMF data tapes recorded on different days were processed Figure 7 shows a comparison of LA Basin results on four different days Although not all identical the results are seen to be similar The primary features mentioned above in connection with tape TMF8l26 (low density over ocean and mountains peak occurring around Long Beach etc) are evident in the other three days traffic as well TMF8l26 recorded on a Sunday exhibits the highest density among these four samples but not by a large factor

The Appendix gives more detailed computer outputs for these four TMF tapes The traffic density map and the range distribution histogram centered at the location of highest density are given for each case

5

40 NUMBER OF AIRCRAFT IN EACH SCAN

30

r-

hVERAGED OVER 40 sec

AVERAGED OVER 120 sec

~

rshylL ltt a u a ltt lL o a w CD ~ J Z

20

10

CENTER POINT RANGE 10 nmi

(-10 -10)

o 50 100 150 200 250 300

SCAN NUMBER

Fig~3 Time variation traffic in the LA area - peak location shy

6

150

I-La 125 lt a U a lt La 0 100

a ILl m ~ ~ Z 75

50 CENTER POINT TMF RANGE 80 nmi

25

l -4-204521_

a 50 100 150 200 250 300

SCAN NUMBER

Fig4 Time variation of traffic in the LA Basin - Total

7

ATC-SO (5)Lt o

TAPE TMF 8128 20 MIN 8AMitlE ~ Lt 100 ---------~-~~-----7__II~____ W-C_ 25middotNMIa-C RANGE-CO() LIMIT g~ Z-CO WI() degOm 50~---------6--+---------4~-G----+---ta--cWI vl~ wzzgt-raquo i=()Oc(ZOJc( 0i ~ 0-----j50a----1-0-0a----1-5-0-------20-0~

raquodeg INSTANTANEOUS NO OF AIRCRAFT

Fig5 Short term variability - Cumulative distribution of aircraft count

ATC-SO (6)

TAPE TMF 8128 20 MIN SAMPLE

o 20 z o ~ ltgt w c 10 c a lt c z LA BASIN lt MEASUREMENTS en

50 100 150 200

AVERAGE NO OF AIRCRAFT n

Fig6 Short term variability - Comparison between mean and standard deviation

8

flgtAIRCRAFT40 9 001 AIRCRAFT

09~ ~ 0 PER nmi2 003 2

0 9 ~~~ PEAK 007 PER nml 20

~ -= o z -20

E c

-40

-60 TMF 8046 TMF 8055 THURS 1630 PST 111176 MON 1230 PST 111576

40

20a 0 ~

0 s

0 ~ -z -20 E c ~ -40

-60 TMF 8122 TMF 8126 SAT 1400 PST 112076 SUN 130 PST 112176

-60 -40 -20 o 20 40 60 -60 -40 -20 o 20 40 60

X lnmi East Mag) X lnmi East Mag)

Fig7 Day-to-day comparison of LA Basin traffic

9

30 TRAFFIC IN OTHER LOCATIONS

Figures 8 9 and 10 present traffic density maps of respectively Washington DC Philadelphia and Boston As in Fig 1 the sYmbols plotted indicate the local density averaged over the region within 10 nmi of each point The Boston data was recorded with the TMF located at Deer Island a favorable site about 2 nmi east of Logan Airport This site was found to give excellent coverage of the airspace around Boston The Philadelphia data was recorded when the TMF was located near Clementon NJ a site about 15 nmi southeast of Philadelphia International Airport also providing excellent coverage

The Washington data in Fig 8 was recorded with the TMF located at Washington National Airport In this case it was found that an excessive number of targets were recorded at close range -- thought to be primarily false targets due to reflections and imperfect sidelobe suppression Because of this condition all targets with ranges less than 2 nmi were deleted prior to the computation of traffic densities This range filtering was done only in the case of the Washington data

Cumulative range distributions N(R) of aircraft plotted in Fig 11 permit comparisons to be made among sites and among different days at each site Each curve gives the range distribution relative to the location of maximum density The curve marked high density traffic model LAl is discussed in the next section

The day-to-day similarities in LA traffic discussed above in connection with Fig 7 are also apparent here with TMF8l26 having the maximum density It is also seen that TMF8l26 exhibits the maximum density among all of the tapes reduced regardless of location The results exhibit a moderate day-to-day repeatability in each location Although the curve shapes in Fig 11 are all similar certain differences may be noted For example N(lO nmi) results at Boston Philadelphia and Washington are all approximately equal and yet N(60 nmi) results exhibit appreciable differences with Philadelphia exceeding Washington and Washington exceeding Boston In other words the traffic density in Boston falls off rapidly away from the location of peak density while Washington and Philadelphia traffic densities falloff less rapidly In all three cases the distribution beyond 10 nmi is moderately well approximately by a uniform-in-range model with 1 to 2 aircraft per nmi (which is considerably less than the 3 aircraft per nmi of LA)

Density map comparisons showing day-to-day repeatability to Washington Philadelphia and Boston are given in Figs 12 13 and 14 Day-to-day changes in spatial distribution are more evident in the Philadelphia plots as compared with the other locations These changes may be the result of the

10

ATe-80 (8)

MEASUREMENT TMF 4039 MON 24 MAY 1976 1114-1134 EDT

- E

J a 0 z

40

20

0

1

1

1

I

s t

J 1 ( J r 1 ~

- -- L 1 Sshy f 4 6 pound J ( f c~~j

I ~ i f

~ ~l l C D I bull A C- 1gt

7 ~

~ 4 45 bull bull ~ ~ 1 1 amp

3 1 I

t 7 s f 1 r 1 f 9

c ~c

bull ~

bull t

8

4shy

3

4shy

J

7

1

z

I

1

~

t

Z 1

~ Z ~

gtshy-20

I t r ( ( ~ sshy f

( ~ S ~

-40 i S

-40 -20 a 20 40 60

X(NMI EAST MAG) KEY -

SYMBOL

123456189ABCDEFGHlJKLMNOPQRST i 11111111 IIIILi iii iii

0001 001 01 1

TRAFFIC DENSITY p (AIRCRAFTINMl2)

Fig8 Traffic density map Washington DC

11

ATe-80 (9)

MEASUREMENT TMF 5026 THURS 24 JUNE 1976 1358-1428 EDTshy

r 7 t bull or r I 7 1 9 q

40

1 z20 3

r r r o

r r r r

Z~

4

3 4

4

-gt -20 ~

r I I

I

7 J 11 I I shy __ - I I

1tN6E ur _ I P~UNIamp--71IIS ~s_ 1

-60 -4Q -20 o 20 40 60

X(NMI EASTMAGJ

KEY shySYMBOL

1234 56789ABCOE FGH IJ KLMNOPQRST 11111111 IIIILI ~I iii bull ~I

0001 001 01 1

TRAFFIC DENSITYp CAIRCRAFTNMI2)

Fig9 Traffic density map Philadelphia

12

ATe-so (10)

MEASUREMENT TMF 3037 MON 29 MARCH1976 1541-1559 EST

I bull

- ~

lt ~

I t-a 0 Z

i z-gtshy

40

20

O

-20

-40

1 r 7

f r 7

~ -f r r 6 I

1 -f 1 ~ 7 if 1

~ ~ ~ 1 ( 1 t

I I 7 7 -A A

I -shy

1 1 8 e 1)

I

1 7 I~

~ bull UJHtN

I IVTAlIshy I

1 7 7 1 ~ 1 p Il shy--------shy7 7 If ~ to ~ ( bull ~--I

11 f7 1 A (

1 ~ A 1 bull 1---

r

f

1

if

bull 6shy

V

l bull Z 1

r z

I z

I

~~c~AFr I yM L I

J I I

I I

z 4 llfmiddot

J l~~

~Ifv1~

-40 -20 0 20 40

XCNMI EAST MAGJ

KEY -SYMBOL

12345678 9ABCDE FGH I J K LMNOPQRS T I I I I I I I I I I I I I l-I i i i V

0001 001 01 1

TRAFFIC DENSITYp (AlRCRAFTNMl2 )

FigIO Traffic density map Boston

13

1000

l18-4-19158 L LA HIGH DENSITY

TRAFFIC MODEL LA

0

W () Z ~ 0

Z I 100 t shy

~

t shy~

~ 0 U Q

ltt ~

o Q W m ~ 10 Z

w () ~ Q W

~

1 _---_--1_6---1-- shy

201052

RANGE R (nmi)

Fig11 Traffic distributions

bull J

6-----

50 100

in range

14

(

CI ~ ~

~

=E ~

IL 0 z ~ a ~

E c

gtshy

Ishy

Fig12

40

20

0

-40 TMF 4001 THURS MAY 6 1976

40

20

-20

-40

40

20

TMF 4045 FRI MAY 28 1976

-60 -40 -20

-40

-20

C42-1705

1600 EDT

40

1300 EDT

0 20 40 60

x (nmi EAST OF TMF MAG)

Day-to-day comparison of Washington traffic

15

C42-1706

40

20

O~---+---++W---------i

-20 )

TMF 5005 -40 TUES JUNE 15 1976 1000 EDT

C)

lt 4i

u i 0 ~

I a 0 z E c

~

40

20

O~---f--l~_~----------l

-20

-40

x (nml EAST OF TMF MAG)

Fig 13 Day-to-day comparison of Philadelphia traffic

16

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

-~Z 30 I- shyf shy

-~ lL ltX f- - shya U a lti I- shy

lL 20 ~ I--

shyo a -- f-_ w -00 ~ -I shy -shyJ shyZ

I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

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50

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I 1 3 t 3 1 1

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6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

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1 1 I 3 6 7 6 3 1 I

I ~

-

-

-

-

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I I

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o I I

50

I

taO

X (nmi East 1 Mag)

FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

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3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

2 If 6 888 8 C C 9 6 t 3 If A C 0 o C 8 8 It 8 8 7 6 6 6 If

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0

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G G G G E 0 B A A A 9 9 8 7 5 G H G F E C A B 8 A 9 8 8 6 5

- r v bull v

H G FEe C A A 9 7 656 5 5

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2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

~7 shy

r-

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I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

75

I 2 2 I 3 J 2

2 + + 3 2 50 2 5 5 At J

I 3 2 I 2 + 5 5 5 2 3 At At At 3 + 5 Igt 5 + 1 1

I 3 5 6 6 7 Igt 8 5 5 3 I 2 3 2 1 2 3 At 6 8 8 8 1 2 Igt 8 8 l 2 I I + J I

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a 2 It

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6

6

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I J J I b b i) b b b 5 J -75 1 3 + 5 I 1

I I 2

~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

-

7 CENTERPOINT -20 nmi -5 nmi -

6 - -rshylL

r shy _

lt -0 U 0 5 - -lt

lL _ r-

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z -

shy--

2 fshy -- -

rshy -

1-shyI--~-

-

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

Ishy

~-

t -75

-50

25

gt- -25

r-o 0 z

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2 2 2 2 4f

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1 2 2 5 5 1 8 A V

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A-28

10 INTRODUCTION

This report summarizes the results of a study to determine air traffic densities at several important locations in the United States This type of information is needed in the development of air traffic control systems such as DABS and BCAS The design and evaluation of these systems depend on traffic density in several ways computer track files must be large enough to accomshymodate all of the traffic encountered and the tolerance to interference must be sufficient to permit undegraded operation even in the presence of the high levels of interference which are to be expected in high traffic density

bull This report presents the results of measurements made in 1976 to determine

the peak air traffic density its spatial distribution and its variation with time for transponder equipped aircraft in the Los Angeles area and at several locations on the East Coast

The primary facility used for these measurements was the MIT Lincoln Laboratory Transportable Measurements Facility (TMF Ref 3) The TMF was originally built and operated for the purpose of testing the design of DABS in realistic air traffic environments During these tests it was found that the quality of the TMF surveillance data was markedly superior to that of the data produced by the currently operational ATCRBS equipment Aircraft tracks in TMF were seen to be more uniform and regular having significantly fewer missed reports and having significantly improved range and azimuth accuracies (Ref 4) For this reason TMF data was used in this traffic density analysis

Discrete ddress ~eacon ~ystem (Ref 1) ~eacon Collision Avoidance ~ystem

(Ref 2)

Air Traffic Control Radar Beacon ~ystem

1

20 TRAFFIC IN THE LA BASIN

The Los Angeles Basin is reputed to have the highest traffic density in the United States As a result there is considerable interest in current LA traffic measurements

21 Spatial Distribution

Figure 1 shows a traffic density map of the LA Basin These results were obtained from a 20 minute recording of TMF data in November 1976 Each alphashynumeric symbol represents the time average of the traffic density within 10 nmi of that location That is the aircraft located within a circle of radius R = 10 nmi were counted and that count averaged over the duration of the sample (here 20 min) this average count was then divided by the area nR2 to obtain a density p in aircraft per nmi 2 The result is shown via a logarithmic scale defined as follows Let

p p = 10 10glO 0001 aircraftnmi2

Then p is converted into an integer by dropping any digits to the right of the decimal point That integer is then represented by an alphabet-extended decimal system where A = 10 B = 11 C = 12 etc The logarithmic scale is marked in Fig 1 for reference

The counting of aircraft is based on target reports and tracks A tarshyget report which correlates with a track is counted as one aircraft

When the Fig 1 data were recorded the TMF was located at Brea Cali shyfornia on a prominent hilltop radar site about 20 nmi inland from the coast (3396deg N Lat 11791deg W Long 1400 ft elev) This site affords good coverage of the LA Basin including the San Fernando Valley and the San Bernardino region Measurements which assess the coverage of this site are discussed in Section 5

The result~ in Fig 1 indicate that the spatial distribution of traffic is very nonuniform As would be expected densities are much lower over the ocean than over the land and are relatively low over the mountainous region beampinning about 15 nmi north of the TMF Peak density is seen to occur in the Long Beach area Although not as dense as the peak local concentrations are apparent in the Van NuysBurbank area in the OntarioRiverside area and along the coast southeast of LA

Figure 2 shows the range distribution of traffic about the location of maximum density namely (X Y) = (-10 nmi -10 nmi) This plot also includes for comparison two simple mathematical models uniform-in-area and uniformshyin-range Comparisons indicate that within 10 nmi the LA data may be approxshyimately described as uniform-in-area with density of 01 aircraftnmi2 and

2

ATe-so (1)

MEASUREMENT TMF 8126 SUN 21 NOVbull 1976 11 30-11 50 PST

20

middot -C

~ 0

I ~

a o z -20

-~ zgt

-40

~o -40 -20 a 20 40

X(NMI EAST MAGJ

KEY shy SYMBOL

123456789ABCOEFGHIJKLMNOpaRST~ I I I I I I I I I I I I Ii Iii I I I bull I iii Ii i i

0001 001 01 1

TRAFFIC DENSITYP (AIRCRAFTNMJ2)

FigI Traffic density map LA Basin

3

zi a) HISTOGRAM

i ATe-80 ( 2 ) -z N 10 shyX ~ o - ~ ~ ~ ~~ ~ LU - ~~ ~~~ Z - ~~~ ~~~ ~ ~~~~ Z~ ~~ IL - ~~~~~~~~ ~~~~~ ~ ~ f ~~ ~ ~ ~ a - v~~ ~Y~~~~~y~~~~ o a - ~~~~~~~~~~~~~~~~~ ~ -~~~~~~~~~~~~~~~~~~~~ --~

-~~~Y~I~~~~~~~~~~ shyIL ~~~~~~~~~~v~V~~~~~~Y~vv~vvzv~o v~ ~ ~~ ~~ vJ a ~~~~~~~~~~~~~~~~~V ~~v~v~~~~~~~~~~LU ~~~~~~y~Z ~ ~l~~~~~~~~~~~~~~~~~CD ~~v~~ ~ ~ z~~~v~ Vf ~ ~~~~~~~~~~~E o ) z o 10 20 30 40 50 60

RANGE- (NMn

b) CUMULATIVE DISTRIBUTIONa LtJ C Z ~ a 100 TMF 8126X MEASUREMENT ~

~ IL UNIFORM-IN-RANGE MODEL4 a () 3 AIRCRAFTNM a 10 ~ IL o UNIFORM-IN-AREA MODEL a 01 AIRCRAFTNM2 LU CD E )z 1- ~__oIIL-L~ L__a___II_a_L_

2 5 10 20 50 RANGE R (NMn

Fig2 Range distribution of traffic -- LA Basin

4

--

t

~

-

between 10 and 50 nmi the data may be approximately described as uniform-inshyrange with density of 3 aircraftnmi

22 Variation with Time

221 Short-Term Variation

The results shown in Figs 1 and 2 were obtained by averaging over a period of 20 minutes Variations with time throughout that period are plotted in Figs 3 and 4 Figure 3 pertains to the traffic within a range of 10 nmi of the location of highest density and Fig 4 includes all traffic within 80 nmi of the TMF

The amount of variability in aircraft count is shown in Fig 5 in the form of the cumulative distribution and in Fig 6 as the standard deviation It might have been expected that the amount of variability would agree approxshyimately with Poisson statistics In the gas model used to represent air traffic in certain cases the probability distribution of aircraft count within any region is Poisson For a random variable with Poisson distribution the standard deviation is equal to the square root of the average value (Ref 5) This relationship is plotted in Fig 6 for comparison with the data It is evident that the measurements conform to the Poisson law to first order and yet the standard deviation of the measured data is consistently less than this simple rule Possible mechanisms for this difference are (1) the structure of air traffic due to ATC and (2) the shortness of the sample (20 min) which because of the fact that it takes about 10 to 60 minutes for individual aircraft to pass through the counting region generally tends to decrease the standard deviation of the sample relative to the longer term standard deviation

222 Day-to-Day Variation

In order to assess day-to-day variation TMF data tapes recorded on different days were processed Figure 7 shows a comparison of LA Basin results on four different days Although not all identical the results are seen to be similar The primary features mentioned above in connection with tape TMF8l26 (low density over ocean and mountains peak occurring around Long Beach etc) are evident in the other three days traffic as well TMF8l26 recorded on a Sunday exhibits the highest density among these four samples but not by a large factor

The Appendix gives more detailed computer outputs for these four TMF tapes The traffic density map and the range distribution histogram centered at the location of highest density are given for each case

5

40 NUMBER OF AIRCRAFT IN EACH SCAN

30

r-

hVERAGED OVER 40 sec

AVERAGED OVER 120 sec

~

rshylL ltt a u a ltt lL o a w CD ~ J Z

20

10

CENTER POINT RANGE 10 nmi

(-10 -10)

o 50 100 150 200 250 300

SCAN NUMBER

Fig~3 Time variation traffic in the LA area - peak location shy

6

150

I-La 125 lt a U a lt La 0 100

a ILl m ~ ~ Z 75

50 CENTER POINT TMF RANGE 80 nmi

25

l -4-204521_

a 50 100 150 200 250 300

SCAN NUMBER

Fig4 Time variation of traffic in the LA Basin - Total

7

ATC-SO (5)Lt o

TAPE TMF 8128 20 MIN 8AMitlE ~ Lt 100 ---------~-~~-----7__II~____ W-C_ 25middotNMIa-C RANGE-CO() LIMIT g~ Z-CO WI() degOm 50~---------6--+---------4~-G----+---ta--cWI vl~ wzzgt-raquo i=()Oc(ZOJc( 0i ~ 0-----j50a----1-0-0a----1-5-0-------20-0~

raquodeg INSTANTANEOUS NO OF AIRCRAFT

Fig5 Short term variability - Cumulative distribution of aircraft count

ATC-SO (6)

TAPE TMF 8128 20 MIN SAMPLE

o 20 z o ~ ltgt w c 10 c a lt c z LA BASIN lt MEASUREMENTS en

50 100 150 200

AVERAGE NO OF AIRCRAFT n

Fig6 Short term variability - Comparison between mean and standard deviation

8

flgtAIRCRAFT40 9 001 AIRCRAFT

09~ ~ 0 PER nmi2 003 2

0 9 ~~~ PEAK 007 PER nml 20

~ -= o z -20

E c

-40

-60 TMF 8046 TMF 8055 THURS 1630 PST 111176 MON 1230 PST 111576

40

20a 0 ~

0 s

0 ~ -z -20 E c ~ -40

-60 TMF 8122 TMF 8126 SAT 1400 PST 112076 SUN 130 PST 112176

-60 -40 -20 o 20 40 60 -60 -40 -20 o 20 40 60

X lnmi East Mag) X lnmi East Mag)

Fig7 Day-to-day comparison of LA Basin traffic

9

30 TRAFFIC IN OTHER LOCATIONS

Figures 8 9 and 10 present traffic density maps of respectively Washington DC Philadelphia and Boston As in Fig 1 the sYmbols plotted indicate the local density averaged over the region within 10 nmi of each point The Boston data was recorded with the TMF located at Deer Island a favorable site about 2 nmi east of Logan Airport This site was found to give excellent coverage of the airspace around Boston The Philadelphia data was recorded when the TMF was located near Clementon NJ a site about 15 nmi southeast of Philadelphia International Airport also providing excellent coverage

The Washington data in Fig 8 was recorded with the TMF located at Washington National Airport In this case it was found that an excessive number of targets were recorded at close range -- thought to be primarily false targets due to reflections and imperfect sidelobe suppression Because of this condition all targets with ranges less than 2 nmi were deleted prior to the computation of traffic densities This range filtering was done only in the case of the Washington data

Cumulative range distributions N(R) of aircraft plotted in Fig 11 permit comparisons to be made among sites and among different days at each site Each curve gives the range distribution relative to the location of maximum density The curve marked high density traffic model LAl is discussed in the next section

The day-to-day similarities in LA traffic discussed above in connection with Fig 7 are also apparent here with TMF8l26 having the maximum density It is also seen that TMF8l26 exhibits the maximum density among all of the tapes reduced regardless of location The results exhibit a moderate day-to-day repeatability in each location Although the curve shapes in Fig 11 are all similar certain differences may be noted For example N(lO nmi) results at Boston Philadelphia and Washington are all approximately equal and yet N(60 nmi) results exhibit appreciable differences with Philadelphia exceeding Washington and Washington exceeding Boston In other words the traffic density in Boston falls off rapidly away from the location of peak density while Washington and Philadelphia traffic densities falloff less rapidly In all three cases the distribution beyond 10 nmi is moderately well approximately by a uniform-in-range model with 1 to 2 aircraft per nmi (which is considerably less than the 3 aircraft per nmi of LA)

Density map comparisons showing day-to-day repeatability to Washington Philadelphia and Boston are given in Figs 12 13 and 14 Day-to-day changes in spatial distribution are more evident in the Philadelphia plots as compared with the other locations These changes may be the result of the

10

ATe-80 (8)

MEASUREMENT TMF 4039 MON 24 MAY 1976 1114-1134 EDT

- E

J a 0 z

40

20

0

1

1

1

I

s t

J 1 ( J r 1 ~

- -- L 1 Sshy f 4 6 pound J ( f c~~j

I ~ i f

~ ~l l C D I bull A C- 1gt

7 ~

~ 4 45 bull bull ~ ~ 1 1 amp

3 1 I

t 7 s f 1 r 1 f 9

c ~c

bull ~

bull t

8

4shy

3

4shy

J

7

1

z

I

1

~

t

Z 1

~ Z ~

gtshy-20

I t r ( ( ~ sshy f

( ~ S ~

-40 i S

-40 -20 a 20 40 60

X(NMI EAST MAG) KEY -

SYMBOL

123456189ABCDEFGHlJKLMNOPQRST i 11111111 IIIILi iii iii

0001 001 01 1

TRAFFIC DENSITY p (AIRCRAFTINMl2)

Fig8 Traffic density map Washington DC

11

ATe-80 (9)

MEASUREMENT TMF 5026 THURS 24 JUNE 1976 1358-1428 EDTshy

r 7 t bull or r I 7 1 9 q

40

1 z20 3

r r r o

r r r r

Z~

4

3 4

4

-gt -20 ~

r I I

I

7 J 11 I I shy __ - I I

1tN6E ur _ I P~UNIamp--71IIS ~s_ 1

-60 -4Q -20 o 20 40 60

X(NMI EASTMAGJ

KEY shySYMBOL

1234 56789ABCOE FGH IJ KLMNOPQRST 11111111 IIIILI ~I iii bull ~I

0001 001 01 1

TRAFFIC DENSITYp CAIRCRAFTNMI2)

Fig9 Traffic density map Philadelphia

12

ATe-so (10)

MEASUREMENT TMF 3037 MON 29 MARCH1976 1541-1559 EST

I bull

- ~

lt ~

I t-a 0 Z

i z-gtshy

40

20

O

-20

-40

1 r 7

f r 7

~ -f r r 6 I

1 -f 1 ~ 7 if 1

~ ~ ~ 1 ( 1 t

I I 7 7 -A A

I -shy

1 1 8 e 1)

I

1 7 I~

~ bull UJHtN

I IVTAlIshy I

1 7 7 1 ~ 1 p Il shy--------shy7 7 If ~ to ~ ( bull ~--I

11 f7 1 A (

1 ~ A 1 bull 1---

r

f

1

if

bull 6shy

V

l bull Z 1

r z

I z

I

~~c~AFr I yM L I

J I I

I I

z 4 llfmiddot

J l~~

~Ifv1~

-40 -20 0 20 40

XCNMI EAST MAGJ

KEY -SYMBOL

12345678 9ABCDE FGH I J K LMNOPQRS T I I I I I I I I I I I I I l-I i i i V

0001 001 01 1

TRAFFIC DENSITYp (AlRCRAFTNMl2 )

FigIO Traffic density map Boston

13

1000

l18-4-19158 L LA HIGH DENSITY

TRAFFIC MODEL LA

0

W () Z ~ 0

Z I 100 t shy

~

t shy~

~ 0 U Q

ltt ~

o Q W m ~ 10 Z

w () ~ Q W

~

1 _---_--1_6---1-- shy

201052

RANGE R (nmi)

Fig11 Traffic distributions

bull J

6-----

50 100

in range

14

(

CI ~ ~

~

=E ~

IL 0 z ~ a ~

E c

gtshy

Ishy

Fig12

40

20

0

-40 TMF 4001 THURS MAY 6 1976

40

20

-20

-40

40

20

TMF 4045 FRI MAY 28 1976

-60 -40 -20

-40

-20

C42-1705

1600 EDT

40

1300 EDT

0 20 40 60

x (nmi EAST OF TMF MAG)

Day-to-day comparison of Washington traffic

15

C42-1706

40

20

O~---+---++W---------i

-20 )

TMF 5005 -40 TUES JUNE 15 1976 1000 EDT

C)

lt 4i

u i 0 ~

I a 0 z E c

~

40

20

O~---f--l~_~----------l

-20

-40

x (nml EAST OF TMF MAG)

Fig 13 Day-to-day comparison of Philadelphia traffic

16

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

-~Z 30 I- shyf shy

-~ lL ltX f- - shya U a lti I- shy

lL 20 ~ I--

shyo a -- f-_ w -00 ~ -I shy -shyJ shyZ

I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

-1-4-20460 shy

fshy -

-50

~

cshy o Z

E c

50

o

f shy

~

I

2

I

I I

I 1 3 t 3 1 1

1 3 t 6 7 5 3 3 2 5 t 5 7 A A A 9 6 I 6

6 9 8 C 0 C A 6 3 5 7 C C E F E 0 8 9 8 C

2 7 9 C E G G G F 0 0 0 E 5 8 8 o E F G H G E E F F 7 9 Il euro --iH-6 II 6 amp--shy7 8 9 8 8 0 F G H I I I I 5 7 8 8 8 9 8 F H I J J J I 3 I I 3 2 3 C F r J J J

9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

I 5 6 5 2 3 3 2

I

I I I 2 I

I 2 3 2 I 2 2 2 t t 3 2

2 2 3 t ~ 6 r 2 2 2 3 3 5 6 D t I

6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

6 F F E [)-euro-- euro--iHt-amp---tr--6--tr-4 H G F E C C A A 9 7 6 6 6 6 I

I H l 0 8 A987t3t31 H G F C A 66132 G F E C 9 I 232 0 0 C C 8 9 7 2 ~ 5 I

9 8 C C C 8 A 8 7 7 6 t

5 8 A C C C 8 8 A 8 8 6 1

6 7 9 8 C C 8 A 9 8 6 t

1 3 5 6 7 9 8 8 B B 7 6 I

3 I 6 9 B B 9 8 5 3 3 5 7 9 9 9 6 3

1 1 I 3 6 7 6 3 1 I

I ~

-

-

-

-

- -

-100

I I

-50 I

o I I

50

I

taO

X (nmi East 1 Mag)

FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

E

c CJ

7 ~ shyI I shyU ~

ltt ~ -shyw Z I- shy

6 l- shy l shylJ I shyltt a

~ u I- shy5a ~-

4 lJ 0 I shy

shya 4 ~

W CD

~

~ - r-_

z ~ - - shy

3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

2 If 6 888 8 C C 9 6 t 3 If A C 0 o C 8 8 It 8 8 7 6 6 6 If

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2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

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RANGE (nmj)

FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

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2 + + 3 2 50 2 5 5 At J

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I 3 5 6 6 7 Igt 8 5 5 3 I 2 3 2 1 2 3 At 6 8 8 8 1 2 Igt 8 8 l 2 I I + J I

25 I 2 2 5 A B A 1 Igt 1 7 1 5 5 6 Igt 5 3 1 2 3 3 1 CO D I I I At 8 A C C 8 8 + 3 I A 8 8 8 A 8 1 5 5 Igt 8 7 7 5 2 2 2 3 6 9 B C E E 0 C 9 8 A 0 0 0 0 8 A 1 Igt 1 1 8 8 7 5 2 ~ 2 At It 6 8 A C E F F F E 0 C C E F E 0 A 9 Igt Igt 7 7 7 7 5 1 ~ 0 Z

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X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

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o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

Ishy

~-

t -75

-50

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gt- -25

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6 If 2

1 2 1 1 3 3 2 2 1 7 3 2 2 2 2 5 6 6 5 3 1 6 7 7 3 2 3 2 2 1 6 8 9 9 8 4f 1 6 6 7 3 5 4f 4f 4f 1 1 7 9 B B A 8 poundf 2 3 At 9 7 8 8 8 6 6 At 4f 5 6 7 8 A C 0 C B 9 8 A A C 0 C 8 B 9 8 1 1 1 1 8 9 B C 0 0 0 0 C C 0 E E E o D B A 9 8 1 1 1 9 A C E F F E 0 E E F F E E 0 C 8 A 8 1 6 6 A - - shy - r _ A

V V V V

1 8 B E F G G G G G o C C B B 8 A 9 1 5 3 3 5 6 8 C F G G H H H G F 0 C 8 8 A 9 1 At 2 1 3 If 5 9 0 F G H H I H G F C C 8 9 8 6 3 2 L 3 6 A C E F Ii H H G E C 8 A 9 1 6 3

2 2 It 7 9 8 C 0 E F F 0 C B A 9 9 7 6 1 2 3 If 6 7 7 8 9 C C B A A B A A 8 7 5

1 2 If 5 6 6 7 7 8 8 9 9 A A 8 8 A 9 5 1 1 2 5 5 6 6 6 7 7 7 1 9 A 8 8 B 8 3

3 It If It At At If 5 5 6 8 A A A 9 3 1 2 2 2 2 1 2 3 t 6 8 A A 8 t

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X (nmi East Mag)

FigA-7 LA map TMF8055

A-9

- -

8 I I r- r J I I I

--4-20467 L ~7 shy

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I- CENTERPOINT -5 nmi -15 nmi _6 ~

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RANGE (nmi)

FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

2 3 3 6 1 881 665 6 6 6 6 It 1 1 3 5 6 1 8 9 981 888 8 1 1 6 ~

1 1 1 3 5 8 A 8 8 988 999 9 1 5 3 1 1 3 3 1 1 3 5 6 9 8 C D 989 A A 9 8 5 2 3 3 3 2

25 - 1 3 5 5 2 2 3 6 9 C o U A 9 A A 8 9 6 If 2 3 4f It 3 -1 3 5 5 6 5 1 A C o 0 888 889 6 If It 2

5 6 5 6 A 0 f E 0 C 8 C C 8 9 6 5 5 5 3 1 ~ 2 If 5 5 1 C E F F E o C 8 8 8 9 1 5 5 3 3 2

Lshy~

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1 1 8 A A C 0 0 o 0

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1 9 A A b B B 8 8 3 1 8 J 9 A A 9 9 A

0 C B 7 6 33 3 2 1 B A 8 6 3 2 3 3 2

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A 9 2 1 5 2 1 2

1 2 2 2 1 3 3 3 2 1 -

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-50 - 1 233 3 2 1 222 1 -223 If 2 1 1 12 3 1 t

2 3 3 1 1 2 1

-75 ~ -

I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

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rshy

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-

mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

~ 1 If 5 6 6 6 9 A B 0 0 0 lt- C B 9 7 5 If

2 3 5 6 6 7 8 A C 0 0 E 0 C B B A 9 7 5 1s ~

2 If If 5 6 7 9 A C 0 E o C 8 A A A 962 ~ o _0 3 5 6 -+-6--amp--e-9--fr~- ~--i---9--8-8 ~ ~ ~ ~ ~

Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

-50 - 332 -shy2 1

-75 1 - shy

1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

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Ishy

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- 0 shy-

05 shy

Ishy

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h I I I o

10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

~

1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

1 3

1 1 2 2 2

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8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

-

--

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--

-

1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

~

-shyz

10 ~ shy-

05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

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1 1 If 5 7 9 8 C 8 8 9 9 C C 8 A 7 3 1 1 gtshy -25 ~ 1 1 2 7 A C C C 8 A A 9 8 8 9 6 -

2 3 3 3 If 6 A C C C A A 9 9 9 9 5 2 3 If 5 5 6 9 8 8 A 8 8 8 9 7 If

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-75 - 2 3 2 1 -

I I ~J I 1 I i I I A shy

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

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Ishy

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IJ shylaquo 0 I- shyu ~ 0

laquo IJ

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2 - shy~ -f-

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~ shy

I- shy

-

J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

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3 It 6 6 6 6 7 8 A amp 8 8 A A A 9 9 9 8 i 6 3 1 2 3 3 2 gt- -25 ~ 3 Ii 7 7 1 7 8 9 B B 8 B A lt1 8 8 9 9 8 7 + 1 -

3 6 7 7 7 7 9 A B B 8 A 7 6 7 A A 9 7 5 3 1 f 6 6 6 8 9 A A A 9 6 If If 7 9 9 8 6 3

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-75 Ishy

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I I I I I I

-100 -75 -50 -25 o 25 50 75 100 bull

x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

I I lr- I I I I

l-4-204771_ 45 I- r- shy

r shy

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shy-r-shy

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10 - - shyI shy

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rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

3 pound+ It 6 8 8 8 1 e 5 3 1 5 1 1 8 8 6 pound+

2 3 pound+ 5 7 8 8 8 1 6 5 5 5 6 6 6 6 8 I 8 6 2 50 ~ 2 3 5 8 lt) lt) lt) 8 6 2 3 5 7 7 6 6 7 8 lt) lt) 8 5 3 -

2 3 5 8 lt) A lt) 7 6 pound+ 1 8 8 1 5 7 8 8 lt) lt) 1 6 3 ~ 3 5 6 7 7 lt) lt) A A 7 5 3 1 6 8 lt) 7 5 3 5 8 lt) lt) lt) 7 3

1 pound+ 6 1 8 S lt) A lt) A 7 5 pound+ 1 3 lt) lt) 8 3 3 3 5 8 9 9 9 6 5 2 3 6 8 9 lt) lt) lt) lt) 8 lt) 8 lt) 8 6 1 A A lt) 6 7 1 8 9 lt) lt) 7 5 pound+ 2 1

0 0

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2 5 6 6 1 2 5 6 7 8 8 8 1 6 5 6 8 8 1 1 5 It 3 1 1 5 6 6 6 6 6 6 6 5 If 1 1 8 6 5 3 1

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1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

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n CENTER POINT 0 10

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30

25

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rh 90 100

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FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

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bullbull11 FigA-21 Boston map TMF3031

A-23

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-100 -75 -50 -25 0 25 50 75 100

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FigA-23 Boston map TMF3037

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FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

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2 5 ~ 01 0 e L-~ 00 Z

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Fig A-25 Boston map TMF3008

I

50

ll-~

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A-27

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bull FigA-26 Boston histogram TMF3008

A-28

20 TRAFFIC IN THE LA BASIN

The Los Angeles Basin is reputed to have the highest traffic density in the United States As a result there is considerable interest in current LA traffic measurements

21 Spatial Distribution

Figure 1 shows a traffic density map of the LA Basin These results were obtained from a 20 minute recording of TMF data in November 1976 Each alphashynumeric symbol represents the time average of the traffic density within 10 nmi of that location That is the aircraft located within a circle of radius R = 10 nmi were counted and that count averaged over the duration of the sample (here 20 min) this average count was then divided by the area nR2 to obtain a density p in aircraft per nmi 2 The result is shown via a logarithmic scale defined as follows Let

p p = 10 10glO 0001 aircraftnmi2

Then p is converted into an integer by dropping any digits to the right of the decimal point That integer is then represented by an alphabet-extended decimal system where A = 10 B = 11 C = 12 etc The logarithmic scale is marked in Fig 1 for reference

The counting of aircraft is based on target reports and tracks A tarshyget report which correlates with a track is counted as one aircraft

When the Fig 1 data were recorded the TMF was located at Brea Cali shyfornia on a prominent hilltop radar site about 20 nmi inland from the coast (3396deg N Lat 11791deg W Long 1400 ft elev) This site affords good coverage of the LA Basin including the San Fernando Valley and the San Bernardino region Measurements which assess the coverage of this site are discussed in Section 5

The result~ in Fig 1 indicate that the spatial distribution of traffic is very nonuniform As would be expected densities are much lower over the ocean than over the land and are relatively low over the mountainous region beampinning about 15 nmi north of the TMF Peak density is seen to occur in the Long Beach area Although not as dense as the peak local concentrations are apparent in the Van NuysBurbank area in the OntarioRiverside area and along the coast southeast of LA

Figure 2 shows the range distribution of traffic about the location of maximum density namely (X Y) = (-10 nmi -10 nmi) This plot also includes for comparison two simple mathematical models uniform-in-area and uniformshyin-range Comparisons indicate that within 10 nmi the LA data may be approxshyimately described as uniform-in-area with density of 01 aircraftnmi2 and

2

ATe-so (1)

MEASUREMENT TMF 8126 SUN 21 NOVbull 1976 11 30-11 50 PST

20

middot -C

~ 0

I ~

a o z -20

-~ zgt

-40

~o -40 -20 a 20 40

X(NMI EAST MAGJ

KEY shy SYMBOL

123456789ABCOEFGHIJKLMNOpaRST~ I I I I I I I I I I I I Ii Iii I I I bull I iii Ii i i

0001 001 01 1

TRAFFIC DENSITYP (AIRCRAFTNMJ2)

FigI Traffic density map LA Basin

3

zi a) HISTOGRAM

i ATe-80 ( 2 ) -z N 10 shyX ~ o - ~ ~ ~ ~~ ~ LU - ~~ ~~~ Z - ~~~ ~~~ ~ ~~~~ Z~ ~~ IL - ~~~~~~~~ ~~~~~ ~ ~ f ~~ ~ ~ ~ a - v~~ ~Y~~~~~y~~~~ o a - ~~~~~~~~~~~~~~~~~ ~ -~~~~~~~~~~~~~~~~~~~~ --~

-~~~Y~I~~~~~~~~~~ shyIL ~~~~~~~~~~v~V~~~~~~Y~vv~vvzv~o v~ ~ ~~ ~~ vJ a ~~~~~~~~~~~~~~~~~V ~~v~v~~~~~~~~~~LU ~~~~~~y~Z ~ ~l~~~~~~~~~~~~~~~~~CD ~~v~~ ~ ~ z~~~v~ Vf ~ ~~~~~~~~~~~E o ) z o 10 20 30 40 50 60

RANGE- (NMn

b) CUMULATIVE DISTRIBUTIONa LtJ C Z ~ a 100 TMF 8126X MEASUREMENT ~

~ IL UNIFORM-IN-RANGE MODEL4 a () 3 AIRCRAFTNM a 10 ~ IL o UNIFORM-IN-AREA MODEL a 01 AIRCRAFTNM2 LU CD E )z 1- ~__oIIL-L~ L__a___II_a_L_

2 5 10 20 50 RANGE R (NMn

Fig2 Range distribution of traffic -- LA Basin

4

--

t

~

-

between 10 and 50 nmi the data may be approximately described as uniform-inshyrange with density of 3 aircraftnmi

22 Variation with Time

221 Short-Term Variation

The results shown in Figs 1 and 2 were obtained by averaging over a period of 20 minutes Variations with time throughout that period are plotted in Figs 3 and 4 Figure 3 pertains to the traffic within a range of 10 nmi of the location of highest density and Fig 4 includes all traffic within 80 nmi of the TMF

The amount of variability in aircraft count is shown in Fig 5 in the form of the cumulative distribution and in Fig 6 as the standard deviation It might have been expected that the amount of variability would agree approxshyimately with Poisson statistics In the gas model used to represent air traffic in certain cases the probability distribution of aircraft count within any region is Poisson For a random variable with Poisson distribution the standard deviation is equal to the square root of the average value (Ref 5) This relationship is plotted in Fig 6 for comparison with the data It is evident that the measurements conform to the Poisson law to first order and yet the standard deviation of the measured data is consistently less than this simple rule Possible mechanisms for this difference are (1) the structure of air traffic due to ATC and (2) the shortness of the sample (20 min) which because of the fact that it takes about 10 to 60 minutes for individual aircraft to pass through the counting region generally tends to decrease the standard deviation of the sample relative to the longer term standard deviation

222 Day-to-Day Variation

In order to assess day-to-day variation TMF data tapes recorded on different days were processed Figure 7 shows a comparison of LA Basin results on four different days Although not all identical the results are seen to be similar The primary features mentioned above in connection with tape TMF8l26 (low density over ocean and mountains peak occurring around Long Beach etc) are evident in the other three days traffic as well TMF8l26 recorded on a Sunday exhibits the highest density among these four samples but not by a large factor

The Appendix gives more detailed computer outputs for these four TMF tapes The traffic density map and the range distribution histogram centered at the location of highest density are given for each case

5

40 NUMBER OF AIRCRAFT IN EACH SCAN

30

r-

hVERAGED OVER 40 sec

AVERAGED OVER 120 sec

~

rshylL ltt a u a ltt lL o a w CD ~ J Z

20

10

CENTER POINT RANGE 10 nmi

(-10 -10)

o 50 100 150 200 250 300

SCAN NUMBER

Fig~3 Time variation traffic in the LA area - peak location shy

6

150

I-La 125 lt a U a lt La 0 100

a ILl m ~ ~ Z 75

50 CENTER POINT TMF RANGE 80 nmi

25

l -4-204521_

a 50 100 150 200 250 300

SCAN NUMBER

Fig4 Time variation of traffic in the LA Basin - Total

7

ATC-SO (5)Lt o

TAPE TMF 8128 20 MIN 8AMitlE ~ Lt 100 ---------~-~~-----7__II~____ W-C_ 25middotNMIa-C RANGE-CO() LIMIT g~ Z-CO WI() degOm 50~---------6--+---------4~-G----+---ta--cWI vl~ wzzgt-raquo i=()Oc(ZOJc( 0i ~ 0-----j50a----1-0-0a----1-5-0-------20-0~

raquodeg INSTANTANEOUS NO OF AIRCRAFT

Fig5 Short term variability - Cumulative distribution of aircraft count

ATC-SO (6)

TAPE TMF 8128 20 MIN SAMPLE

o 20 z o ~ ltgt w c 10 c a lt c z LA BASIN lt MEASUREMENTS en

50 100 150 200

AVERAGE NO OF AIRCRAFT n

Fig6 Short term variability - Comparison between mean and standard deviation

8

flgtAIRCRAFT40 9 001 AIRCRAFT

09~ ~ 0 PER nmi2 003 2

0 9 ~~~ PEAK 007 PER nml 20

~ -= o z -20

E c

-40

-60 TMF 8046 TMF 8055 THURS 1630 PST 111176 MON 1230 PST 111576

40

20a 0 ~

0 s

0 ~ -z -20 E c ~ -40

-60 TMF 8122 TMF 8126 SAT 1400 PST 112076 SUN 130 PST 112176

-60 -40 -20 o 20 40 60 -60 -40 -20 o 20 40 60

X lnmi East Mag) X lnmi East Mag)

Fig7 Day-to-day comparison of LA Basin traffic

9

30 TRAFFIC IN OTHER LOCATIONS

Figures 8 9 and 10 present traffic density maps of respectively Washington DC Philadelphia and Boston As in Fig 1 the sYmbols plotted indicate the local density averaged over the region within 10 nmi of each point The Boston data was recorded with the TMF located at Deer Island a favorable site about 2 nmi east of Logan Airport This site was found to give excellent coverage of the airspace around Boston The Philadelphia data was recorded when the TMF was located near Clementon NJ a site about 15 nmi southeast of Philadelphia International Airport also providing excellent coverage

The Washington data in Fig 8 was recorded with the TMF located at Washington National Airport In this case it was found that an excessive number of targets were recorded at close range -- thought to be primarily false targets due to reflections and imperfect sidelobe suppression Because of this condition all targets with ranges less than 2 nmi were deleted prior to the computation of traffic densities This range filtering was done only in the case of the Washington data

Cumulative range distributions N(R) of aircraft plotted in Fig 11 permit comparisons to be made among sites and among different days at each site Each curve gives the range distribution relative to the location of maximum density The curve marked high density traffic model LAl is discussed in the next section

The day-to-day similarities in LA traffic discussed above in connection with Fig 7 are also apparent here with TMF8l26 having the maximum density It is also seen that TMF8l26 exhibits the maximum density among all of the tapes reduced regardless of location The results exhibit a moderate day-to-day repeatability in each location Although the curve shapes in Fig 11 are all similar certain differences may be noted For example N(lO nmi) results at Boston Philadelphia and Washington are all approximately equal and yet N(60 nmi) results exhibit appreciable differences with Philadelphia exceeding Washington and Washington exceeding Boston In other words the traffic density in Boston falls off rapidly away from the location of peak density while Washington and Philadelphia traffic densities falloff less rapidly In all three cases the distribution beyond 10 nmi is moderately well approximately by a uniform-in-range model with 1 to 2 aircraft per nmi (which is considerably less than the 3 aircraft per nmi of LA)

Density map comparisons showing day-to-day repeatability to Washington Philadelphia and Boston are given in Figs 12 13 and 14 Day-to-day changes in spatial distribution are more evident in the Philadelphia plots as compared with the other locations These changes may be the result of the

10

ATe-80 (8)

MEASUREMENT TMF 4039 MON 24 MAY 1976 1114-1134 EDT

- E

J a 0 z

40

20

0

1

1

1

I

s t

J 1 ( J r 1 ~

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-40 -20 a 20 40 60

X(NMI EAST MAG) KEY -

SYMBOL

123456189ABCDEFGHlJKLMNOPQRST i 11111111 IIIILi iii iii

0001 001 01 1

TRAFFIC DENSITY p (AIRCRAFTINMl2)

Fig8 Traffic density map Washington DC

11

ATe-80 (9)

MEASUREMENT TMF 5026 THURS 24 JUNE 1976 1358-1428 EDTshy

r 7 t bull or r I 7 1 9 q

40

1 z20 3

r r r o

r r r r

Z~

4

3 4

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-60 -4Q -20 o 20 40 60

X(NMI EASTMAGJ

KEY shySYMBOL

1234 56789ABCOE FGH IJ KLMNOPQRST 11111111 IIIILI ~I iii bull ~I

0001 001 01 1

TRAFFIC DENSITYp CAIRCRAFTNMI2)

Fig9 Traffic density map Philadelphia

12

ATe-so (10)

MEASUREMENT TMF 3037 MON 29 MARCH1976 1541-1559 EST

I bull

- ~

lt ~

I t-a 0 Z

i z-gtshy

40

20

O

-20

-40

1 r 7

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1 7 7 1 ~ 1 p Il shy--------shy7 7 If ~ to ~ ( bull ~--I

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r

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l bull Z 1

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KEY -SYMBOL

12345678 9ABCDE FGH I J K LMNOPQRS T I I I I I I I I I I I I I l-I i i i V

0001 001 01 1

TRAFFIC DENSITYp (AlRCRAFTNMl2 )

FigIO Traffic density map Boston

13

1000

l18-4-19158 L LA HIGH DENSITY

TRAFFIC MODEL LA

0

W () Z ~ 0

Z I 100 t shy

~

t shy~

~ 0 U Q

ltt ~

o Q W m ~ 10 Z

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Fig11 Traffic distributions

bull J

6-----

50 100

in range

14

(

CI ~ ~

~

=E ~

IL 0 z ~ a ~

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gtshy

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Fig12

40

20

0

-40 TMF 4001 THURS MAY 6 1976

40

20

-20

-40

40

20

TMF 4045 FRI MAY 28 1976

-60 -40 -20

-40

-20

C42-1705

1600 EDT

40

1300 EDT

0 20 40 60

x (nmi EAST OF TMF MAG)

Day-to-day comparison of Washington traffic

15

C42-1706

40

20

O~---+---++W---------i

-20 )

TMF 5005 -40 TUES JUNE 15 1976 1000 EDT

C)

lt 4i

u i 0 ~

I a 0 z E c

~

40

20

O~---f--l~_~----------l

-20

-40

x (nml EAST OF TMF MAG)

Fig 13 Day-to-day comparison of Philadelphia traffic

16

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

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lL 20 ~ I--

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I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

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FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

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7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

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FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

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FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

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I J J I b b i) b b b 5 J -75 1 3 + 5 I 1

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~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

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z -

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FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

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V V V V

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FigA-7 LA map TMF8055

A-9

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8 I I r- r J I I I

--4-20467 L ~7 shy

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- nTh+-_ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

2 3 3 6 1 881 665 6 6 6 6 It 1 1 3 5 6 1 8 9 981 888 8 1 1 6 ~

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gt- -25 - 3 5 6 7 8 9 8 9 9 1 2 5 5 6 1 1 8 8 8

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-50 - 1 233 3 2 1 222 1 -223 If 2 1 1 12 3 1 t

2 3 3 1 1 2 1

-75 ~ -

I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

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1-shy

r- 0 shy

rshy

-- -05 shy- Ishy

-

mJ4 o 10 20 4030 50 60 70 9080 100

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FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

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Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

-50 - 332 -shy2 1

-75 1 - shy

1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

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Ishy

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- 0 shy-

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Ishy

~

h I I I o

10 20 30 40 50 60 70 80 90 100

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FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

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1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

1 3

1 1 2 2 2

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8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

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--

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--

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1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

~

-shyz

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05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

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FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

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-75 - 2 3 2 1 -

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-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

-- -

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laquo IJ

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2 - shy~ -f-

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I- shy

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J 1n o 10 20 30 40 50 60 70 80 90 100

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FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

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2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

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8 9 7

8 6 5 7 5 If

It 1 3

If

+ 5 5 5 +

3

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3 6 7 7 7 7 9 A B B 8 A 7 6 7 A A 9 7 5 3 1 f 6 6 6 8 9 A A A 9 6 If If 7 9 9 8 6 3

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I I 2 3 1 2 1 I 3 3 2 1

-75 Ishy

2 2 I I -I

I I I I I I

-100 -75 -50 -25 o 25 50 75 100 bull

x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

I I lr- I I I I

l-4-204771_ 45 I- r- shy

r shy

~ ~ - CENTER POINT 020 nmi ~r-40 - shy-

shy-r-shy

rshy35 - r- shy

r- _rshy -~ ~ 30 ~ - - shyoCt

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rshy25 r- shy

0 ~

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m 20 shyE - - shygt z

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I shy

10 - - shyI shy

-rshy-r shy

05 - - shy

- ~

rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

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2 3 5 8 lt) A lt) 7 6 pound+ 1 8 8 1 5 7 8 8 lt) lt) 1 6 3 ~ 3 5 6 7 7 lt) lt) A A 7 5 3 1 6 8 lt) 7 5 3 5 8 lt) lt) lt) 7 3

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3 6 1 1 6 5 2 2 pound+ If If 5 1 1 6 It 2 1 1 5 7 1 6 6 3 2 If 5 6 6 It

-50 - 1 pound+ 6 1 5 3 1 1 3 If If If 3 -3 If 5 1 2 2 2 If If 3

1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

~ u lt 0 U 0 lt

u 0 0 W (II

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25

20

15

-

-

-

-

-rshy

10 -

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o 10 20 30 40 50 60 70 80

rh 90 100

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FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

s shy~

00 2

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f r

-

2 2 3 5 5 2

6 5 6 1 3 6 6 1 1 1 5 1 8 If 2 1 1 1 8 9 8 6 6 8 8 If 2 2

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q t II) 6 8 8 9 f T 5 t Cgt 3 1 ~ 1 If 5 T 9 A e a 8 8 6 It 3 5 5 5 5 1 9 8 C C 8 9 8 6

1 3 ~ 5 6 f 6 A C 0 E E A 8 5 1

1 5 7 1 8 ( 9 8 o E F F C 8 2 2 1 ~

ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

1 If 5 8 8 816 8 7 5 3 3 5 6 1 716 1 1 6 3

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-25 o I

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75 100

bull x (nmi East Mag)

bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

- r- I r r I I I 1 I

l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

35 ~ -

r-

t 30 laquo 0 U g laquo 25 u 0

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15

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~

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10 - -shy

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~

~l I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

--

CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

a w OJ ~ gt z

-

-

~

25

20

15

- -

-- -shy -

-shyrshy

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~

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-I

-

-

shy

~ ~10

~

- ~

-

~ -05 -

o 10 20 30

RANGE

40 50

Il (nmil

60

I

70 I

80

I

90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

1 It 5 6 6 7 7 9 A 0 0 2 It 5 6 7 7 7 7 9 A A

2 It 5 II 6 6 5 It 7 8 7 2 It 5 It 3 3 If 3 If If 3 I 2 3 2 2 3 2 1 I I 2 3 2 1 I

1 1

2 3 ~

It 5 6 5 6 6 6 t 5 6 5 5 It 3 7 J

If

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It 5 5 5 3 I

2 3 ~

2

-

-

-

-50 Ishy -

-75 Ishy -

bull bull

-100 I

-75 I I I

-50 -25 0 25

X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

0 15 ~ - shyw CD E shygt z

-~

~ -r shy10 shy-- - r-

~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

ATe-so (1)

MEASUREMENT TMF 8126 SUN 21 NOVbull 1976 11 30-11 50 PST

20

middot -C

~ 0

I ~

a o z -20

-~ zgt

-40

~o -40 -20 a 20 40

X(NMI EAST MAGJ

KEY shy SYMBOL

123456789ABCOEFGHIJKLMNOpaRST~ I I I I I I I I I I I I Ii Iii I I I bull I iii Ii i i

0001 001 01 1

TRAFFIC DENSITYP (AIRCRAFTNMJ2)

FigI Traffic density map LA Basin

3

zi a) HISTOGRAM

i ATe-80 ( 2 ) -z N 10 shyX ~ o - ~ ~ ~ ~~ ~ LU - ~~ ~~~ Z - ~~~ ~~~ ~ ~~~~ Z~ ~~ IL - ~~~~~~~~ ~~~~~ ~ ~ f ~~ ~ ~ ~ a - v~~ ~Y~~~~~y~~~~ o a - ~~~~~~~~~~~~~~~~~ ~ -~~~~~~~~~~~~~~~~~~~~ --~

-~~~Y~I~~~~~~~~~~ shyIL ~~~~~~~~~~v~V~~~~~~Y~vv~vvzv~o v~ ~ ~~ ~~ vJ a ~~~~~~~~~~~~~~~~~V ~~v~v~~~~~~~~~~LU ~~~~~~y~Z ~ ~l~~~~~~~~~~~~~~~~~CD ~~v~~ ~ ~ z~~~v~ Vf ~ ~~~~~~~~~~~E o ) z o 10 20 30 40 50 60

RANGE- (NMn

b) CUMULATIVE DISTRIBUTIONa LtJ C Z ~ a 100 TMF 8126X MEASUREMENT ~

~ IL UNIFORM-IN-RANGE MODEL4 a () 3 AIRCRAFTNM a 10 ~ IL o UNIFORM-IN-AREA MODEL a 01 AIRCRAFTNM2 LU CD E )z 1- ~__oIIL-L~ L__a___II_a_L_

2 5 10 20 50 RANGE R (NMn

Fig2 Range distribution of traffic -- LA Basin

4

--

t

~

-

between 10 and 50 nmi the data may be approximately described as uniform-inshyrange with density of 3 aircraftnmi

22 Variation with Time

221 Short-Term Variation

The results shown in Figs 1 and 2 were obtained by averaging over a period of 20 minutes Variations with time throughout that period are plotted in Figs 3 and 4 Figure 3 pertains to the traffic within a range of 10 nmi of the location of highest density and Fig 4 includes all traffic within 80 nmi of the TMF

The amount of variability in aircraft count is shown in Fig 5 in the form of the cumulative distribution and in Fig 6 as the standard deviation It might have been expected that the amount of variability would agree approxshyimately with Poisson statistics In the gas model used to represent air traffic in certain cases the probability distribution of aircraft count within any region is Poisson For a random variable with Poisson distribution the standard deviation is equal to the square root of the average value (Ref 5) This relationship is plotted in Fig 6 for comparison with the data It is evident that the measurements conform to the Poisson law to first order and yet the standard deviation of the measured data is consistently less than this simple rule Possible mechanisms for this difference are (1) the structure of air traffic due to ATC and (2) the shortness of the sample (20 min) which because of the fact that it takes about 10 to 60 minutes for individual aircraft to pass through the counting region generally tends to decrease the standard deviation of the sample relative to the longer term standard deviation

222 Day-to-Day Variation

In order to assess day-to-day variation TMF data tapes recorded on different days were processed Figure 7 shows a comparison of LA Basin results on four different days Although not all identical the results are seen to be similar The primary features mentioned above in connection with tape TMF8l26 (low density over ocean and mountains peak occurring around Long Beach etc) are evident in the other three days traffic as well TMF8l26 recorded on a Sunday exhibits the highest density among these four samples but not by a large factor

The Appendix gives more detailed computer outputs for these four TMF tapes The traffic density map and the range distribution histogram centered at the location of highest density are given for each case

5

40 NUMBER OF AIRCRAFT IN EACH SCAN

30

r-

hVERAGED OVER 40 sec

AVERAGED OVER 120 sec

~

rshylL ltt a u a ltt lL o a w CD ~ J Z

20

10

CENTER POINT RANGE 10 nmi

(-10 -10)

o 50 100 150 200 250 300

SCAN NUMBER

Fig~3 Time variation traffic in the LA area - peak location shy

6

150

I-La 125 lt a U a lt La 0 100

a ILl m ~ ~ Z 75

50 CENTER POINT TMF RANGE 80 nmi

25

l -4-204521_

a 50 100 150 200 250 300

SCAN NUMBER

Fig4 Time variation of traffic in the LA Basin - Total

7

ATC-SO (5)Lt o

TAPE TMF 8128 20 MIN 8AMitlE ~ Lt 100 ---------~-~~-----7__II~____ W-C_ 25middotNMIa-C RANGE-CO() LIMIT g~ Z-CO WI() degOm 50~---------6--+---------4~-G----+---ta--cWI vl~ wzzgt-raquo i=()Oc(ZOJc( 0i ~ 0-----j50a----1-0-0a----1-5-0-------20-0~

raquodeg INSTANTANEOUS NO OF AIRCRAFT

Fig5 Short term variability - Cumulative distribution of aircraft count

ATC-SO (6)

TAPE TMF 8128 20 MIN SAMPLE

o 20 z o ~ ltgt w c 10 c a lt c z LA BASIN lt MEASUREMENTS en

50 100 150 200

AVERAGE NO OF AIRCRAFT n

Fig6 Short term variability - Comparison between mean and standard deviation

8

flgtAIRCRAFT40 9 001 AIRCRAFT

09~ ~ 0 PER nmi2 003 2

0 9 ~~~ PEAK 007 PER nml 20

~ -= o z -20

E c

-40

-60 TMF 8046 TMF 8055 THURS 1630 PST 111176 MON 1230 PST 111576

40

20a 0 ~

0 s

0 ~ -z -20 E c ~ -40

-60 TMF 8122 TMF 8126 SAT 1400 PST 112076 SUN 130 PST 112176

-60 -40 -20 o 20 40 60 -60 -40 -20 o 20 40 60

X lnmi East Mag) X lnmi East Mag)

Fig7 Day-to-day comparison of LA Basin traffic

9

30 TRAFFIC IN OTHER LOCATIONS

Figures 8 9 and 10 present traffic density maps of respectively Washington DC Philadelphia and Boston As in Fig 1 the sYmbols plotted indicate the local density averaged over the region within 10 nmi of each point The Boston data was recorded with the TMF located at Deer Island a favorable site about 2 nmi east of Logan Airport This site was found to give excellent coverage of the airspace around Boston The Philadelphia data was recorded when the TMF was located near Clementon NJ a site about 15 nmi southeast of Philadelphia International Airport also providing excellent coverage

The Washington data in Fig 8 was recorded with the TMF located at Washington National Airport In this case it was found that an excessive number of targets were recorded at close range -- thought to be primarily false targets due to reflections and imperfect sidelobe suppression Because of this condition all targets with ranges less than 2 nmi were deleted prior to the computation of traffic densities This range filtering was done only in the case of the Washington data

Cumulative range distributions N(R) of aircraft plotted in Fig 11 permit comparisons to be made among sites and among different days at each site Each curve gives the range distribution relative to the location of maximum density The curve marked high density traffic model LAl is discussed in the next section

The day-to-day similarities in LA traffic discussed above in connection with Fig 7 are also apparent here with TMF8l26 having the maximum density It is also seen that TMF8l26 exhibits the maximum density among all of the tapes reduced regardless of location The results exhibit a moderate day-to-day repeatability in each location Although the curve shapes in Fig 11 are all similar certain differences may be noted For example N(lO nmi) results at Boston Philadelphia and Washington are all approximately equal and yet N(60 nmi) results exhibit appreciable differences with Philadelphia exceeding Washington and Washington exceeding Boston In other words the traffic density in Boston falls off rapidly away from the location of peak density while Washington and Philadelphia traffic densities falloff less rapidly In all three cases the distribution beyond 10 nmi is moderately well approximately by a uniform-in-range model with 1 to 2 aircraft per nmi (which is considerably less than the 3 aircraft per nmi of LA)

Density map comparisons showing day-to-day repeatability to Washington Philadelphia and Boston are given in Figs 12 13 and 14 Day-to-day changes in spatial distribution are more evident in the Philadelphia plots as compared with the other locations These changes may be the result of the

10

ATe-80 (8)

MEASUREMENT TMF 4039 MON 24 MAY 1976 1114-1134 EDT

- E

J a 0 z

40

20

0

1

1

1

I

s t

J 1 ( J r 1 ~

- -- L 1 Sshy f 4 6 pound J ( f c~~j

I ~ i f

~ ~l l C D I bull A C- 1gt

7 ~

~ 4 45 bull bull ~ ~ 1 1 amp

3 1 I

t 7 s f 1 r 1 f 9

c ~c

bull ~

bull t

8

4shy

3

4shy

J

7

1

z

I

1

~

t

Z 1

~ Z ~

gtshy-20

I t r ( ( ~ sshy f

( ~ S ~

-40 i S

-40 -20 a 20 40 60

X(NMI EAST MAG) KEY -

SYMBOL

123456189ABCDEFGHlJKLMNOPQRST i 11111111 IIIILi iii iii

0001 001 01 1

TRAFFIC DENSITY p (AIRCRAFTINMl2)

Fig8 Traffic density map Washington DC

11

ATe-80 (9)

MEASUREMENT TMF 5026 THURS 24 JUNE 1976 1358-1428 EDTshy

r 7 t bull or r I 7 1 9 q

40

1 z20 3

r r r o

r r r r

Z~

4

3 4

4

-gt -20 ~

r I I

I

7 J 11 I I shy __ - I I

1tN6E ur _ I P~UNIamp--71IIS ~s_ 1

-60 -4Q -20 o 20 40 60

X(NMI EASTMAGJ

KEY shySYMBOL

1234 56789ABCOE FGH IJ KLMNOPQRST 11111111 IIIILI ~I iii bull ~I

0001 001 01 1

TRAFFIC DENSITYp CAIRCRAFTNMI2)

Fig9 Traffic density map Philadelphia

12

ATe-so (10)

MEASUREMENT TMF 3037 MON 29 MARCH1976 1541-1559 EST

I bull

- ~

lt ~

I t-a 0 Z

i z-gtshy

40

20

O

-20

-40

1 r 7

f r 7

~ -f r r 6 I

1 -f 1 ~ 7 if 1

~ ~ ~ 1 ( 1 t

I I 7 7 -A A

I -shy

1 1 8 e 1)

I

1 7 I~

~ bull UJHtN

I IVTAlIshy I

1 7 7 1 ~ 1 p Il shy--------shy7 7 If ~ to ~ ( bull ~--I

11 f7 1 A (

1 ~ A 1 bull 1---

r

f

1

if

bull 6shy

V

l bull Z 1

r z

I z

I

~~c~AFr I yM L I

J I I

I I

z 4 llfmiddot

J l~~

~Ifv1~

-40 -20 0 20 40

XCNMI EAST MAGJ

KEY -SYMBOL

12345678 9ABCDE FGH I J K LMNOPQRS T I I I I I I I I I I I I I l-I i i i V

0001 001 01 1

TRAFFIC DENSITYp (AlRCRAFTNMl2 )

FigIO Traffic density map Boston

13

1000

l18-4-19158 L LA HIGH DENSITY

TRAFFIC MODEL LA

0

W () Z ~ 0

Z I 100 t shy

~

t shy~

~ 0 U Q

ltt ~

o Q W m ~ 10 Z

w () ~ Q W

~

1 _---_--1_6---1-- shy

201052

RANGE R (nmi)

Fig11 Traffic distributions

bull J

6-----

50 100

in range

14

(

CI ~ ~

~

=E ~

IL 0 z ~ a ~

E c

gtshy

Ishy

Fig12

40

20

0

-40 TMF 4001 THURS MAY 6 1976

40

20

-20

-40

40

20

TMF 4045 FRI MAY 28 1976

-60 -40 -20

-40

-20

C42-1705

1600 EDT

40

1300 EDT

0 20 40 60

x (nmi EAST OF TMF MAG)

Day-to-day comparison of Washington traffic

15

C42-1706

40

20

O~---+---++W---------i

-20 )

TMF 5005 -40 TUES JUNE 15 1976 1000 EDT

C)

lt 4i

u i 0 ~

I a 0 z E c

~

40

20

O~---f--l~_~----------l

-20

-40

x (nml EAST OF TMF MAG)

Fig 13 Day-to-day comparison of Philadelphia traffic

16

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

-~Z 30 I- shyf shy

-~ lL ltX f- - shya U a lti I- shy

lL 20 ~ I--

shyo a -- f-_ w -00 ~ -I shy -shyJ shyZ

I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

-1-4-20460 shy

fshy -

-50

~

cshy o Z

E c

50

o

f shy

~

I

2

I

I I

I 1 3 t 3 1 1

1 3 t 6 7 5 3 3 2 5 t 5 7 A A A 9 6 I 6

6 9 8 C 0 C A 6 3 5 7 C C E F E 0 8 9 8 C

2 7 9 C E G G G F 0 0 0 E 5 8 8 o E F G H G E E F F 7 9 Il euro --iH-6 II 6 amp--shy7 8 9 8 8 0 F G H I I I I 5 7 8 8 8 9 8 F H I J J J I 3 I I 3 2 3 C F r J J J

9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

I 5 6 5 2 3 3 2

I

I I I 2 I

I 2 3 2 I 2 2 2 t t 3 2

2 2 3 t ~ 6 r 2 2 2 3 3 5 6 D t I

6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

6 F F E [)-euro-- euro--iHt-amp---tr--6--tr-4 H G F E C C A A 9 7 6 6 6 6 I

I H l 0 8 A987t3t31 H G F C A 66132 G F E C 9 I 232 0 0 C C 8 9 7 2 ~ 5 I

9 8 C C C 8 A 8 7 7 6 t

5 8 A C C C 8 8 A 8 8 6 1

6 7 9 8 C C 8 A 9 8 6 t

1 3 5 6 7 9 8 8 B B 7 6 I

3 I 6 9 B B 9 8 5 3 3 5 7 9 9 9 6 3

1 1 I 3 6 7 6 3 1 I

I ~

-

-

-

-

- -

-100

I I

-50 I

o I I

50

I

taO

X (nmi East 1 Mag)

FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

E

c CJ

7 ~ shyI I shyU ~

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W CD

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z ~ - - shy

3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

2 If 6 888 8 C C 9 6 t 3 If A C 0 o C 8 8 It 8 8 7 6 6 6 If

2 t 7 9 888 DEE C A A It 8 E F F F 0 C 8 A A A 9 7 7 6 If 2 rshy~

o Z

0

2 5 8 9 ABC 0 E F FED 0 o E 379 A ceo 0 E F G G F G F F- - - - -

If 8 9 9 Ace 0 F F H H H H H

G G G G E 0 B A A A 9 9 8 7 5 G H G F E C A B 8 A 9 8 8 6 5

- r v bull v

H G FEe C A A 9 7 656 5 5

2

E c-

2 6 8 8 A A 8 C E G H I I 3lf5776AE G H I

I I

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H F C 8 899 7 6 2 1 If H G C 9 776 2

If

1 3

1 2 1 8 E F G H H GEe 9 5 5 2 gt- - 25 - 3 A C C 0 F E 0 C It A 8 5 5 5 2 -

5 8 8 7 A B 888 A A 9 7 6 3 If 6 6 1 6 9 A 8 8 8 A 8 5 1 2 5 If 1 1 2 7 A 8 B 8 8 5 2

2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

~7 shy

r-

t- ~~

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lti r shy

~

0 ~

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~

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4 shyz fshy -

rshy

-1--shy~ -

I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

75

I 2 2 I 3 J 2

2 + + 3 2 50 2 5 5 At J

I 3 2 I 2 + 5 5 5 2 3 At At At 3 + 5 Igt 5 + 1 1

I 3 5 6 6 7 Igt 8 5 5 3 I 2 3 2 1 2 3 At 6 8 8 8 1 2 Igt 8 8 l 2 I I + J I

25 I 2 2 5 A B A 1 Igt 1 7 1 5 5 6 Igt 5 3 1 2 3 3 1 CO D I I I At 8 A C C 8 8 + 3 I A 8 8 8 A 8 1 5 5 Igt 8 7 7 5 2 2 2 3 6 9 B C E E 0 C 9 8 A 0 0 0 0 8 A 1 Igt 1 1 8 8 7 5 2 ~ 2 At It 6 8 A C E F F F E 0 C C E F E 0 A 9 Igt Igt 7 7 7 7 5 1 ~ 0 Z

a 2 It

It

5

6

6

7

8

8

8

9

B C E F H I H GEE -++-t-j-fmiddot-~ oF-

A B C F H r J I H G

F FEe 8 9-9- f Dell a 8 9

8

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7

9

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7

8

6

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3

9 A A D G I I r I 4

7 8 9 9 0 G H H 11

66669CE G 2 + At + 7 9 A A C 0

G E C 1 G E f A

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9 I

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8

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5

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5 5

5 5 + 3

3 3 2 2

I 3 + 5 1 9 9 9 8 A II A A II A 9 7 5 5 5 + I I I 3 + 5 7 8 8 9 8 r 889 A A ~ 8 8 7 5 1

2 3 3 + 6 Igt Igt 7 8 9 8 5 2 l 1 9 A A 9 7 5 I

2 3 3 57768A4 A I J 5 9 A 8 1 5

-50 2 3 I

3 5 2

Igt 5 1

7 Igt

7 5 5

7 1

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9 9

8

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9

A

B

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8

1

8

5

1 J 5

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If

6 b

(I A II

7 9

A II

9

9 7

9 7 t

6 1

I + 5 5 Igt 7 II 8 7 7 b b 7 Igt It

I J J I b b i) b b b 5 J -75 1 3 + 5 I 1

I I 2

~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

-

7 CENTERPOINT -20 nmi -5 nmi -

6 - -rshylL

r shy _

lt -0 U 0 5 - -lt

lL _ r-

o -0 W 4 - -CD ~ ~ r-

z -

shy--

2 fshy -- -

rshy -

1-shyI--~-

-

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

Ishy

~-

t -75

-50

25

gt- -25

r-o 0 z

E c

1

1 1 2

A bull amp

1

2 2 2 1 If

2

2 2 2 2 4f

If bull

2

1

3 2 4f

5 1 V

4f

3

1 2 2 5 5 1 8 A V

6 If 2

1 2 1 1 3 3 2 2 1 7 3 2 2 2 2 5 6 6 5 3 1 6 7 7 3 2 3 2 2 1 6 8 9 9 8 4f 1 6 6 7 3 5 4f 4f 4f 1 1 7 9 B B A 8 poundf 2 3 At 9 7 8 8 8 6 6 At 4f 5 6 7 8 A C 0 C B 9 8 A A C 0 C 8 B 9 8 1 1 1 1 8 9 B C 0 0 0 0 C C 0 E E E o D B A 9 8 1 1 1 9 A C E F F E 0 E E F F E E 0 C 8 A 8 1 6 6 A - - shy - r _ A

V V V V

1 8 B E F G G G G G o C C B B 8 A 9 1 5 3 3 5 6 8 C F G G H H H G F 0 C 8 8 A 9 1 At 2 1 3 If 5 9 0 F G H H I H G F C C 8 9 8 6 3 2 L 3 6 A C E F Ii H H G E C 8 A 9 1 6 3

2 2 It 7 9 8 C 0 E F F 0 C B A 9 9 7 6 1 2 3 If 6 7 7 8 9 C C B A A B A A 8 7 5

1 2 If 5 6 6 7 7 8 8 9 9 A A 8 8 A 9 5 1 1 2 5 5 6 6 6 7 7 7 1 9 A 8 8 B 8 3

3 It If It At At If 5 5 6 8 A A A 9 3 1 2 2 2 2 1 2 3 t 6 8 A A 8 t

2 t 6 9 8 A 8 5 1 I 3 3 3 8 9 9 A 7 At

I 1 3 It t 1 1 8 8 3 1 2 3 If 2 1 5 6

I 1 1

7 8 7 7

3

5 6 6

5

2

3 At

4f 3 ~

1

1 1

-

-

-

-

I I I J I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-7 LA map TMF8055

A-9

- -

8 I I r- r J I I I

--4-20467 L ~7 shy

I shy

I- CENTERPOINT -5 nmi -15 nmi _6 ~

f shy

~shy 5 shy

IJ I- shyltX ~

n u I shyn

I shyltX r- r shy

~ ~- shyIJ o

l- f shy0 W CD ~ ~ ~ ~ z 3 - - shy

-rshy

~ f-f- shy2 - shy

-f- shy

~ ~-~ -I shy

- nTh+-_ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

2 3 3 6 1 881 665 6 6 6 6 It 1 1 3 5 6 1 8 9 981 888 8 1 1 6 ~

1 1 1 3 5 8 A 8 8 988 999 9 1 5 3 1 1 3 3 1 1 3 5 6 9 8 C D 989 A A 9 8 5 2 3 3 3 2

25 - 1 3 5 5 2 2 3 6 9 C o U A 9 A A 8 9 6 If 2 3 4f It 3 -1 3 5 5 6 5 1 A C o 0 888 889 6 If It 2

5 6 5 6 A 0 f E 0 C 8 C C 8 9 6 5 5 5 3 1 ~ 2 If 5 5 1 C E F F E o C 8 8 8 9 1 5 5 3 3 2

Lshy~

o z

0 1 1 12236 8 0 F F F E shy bull v

1 1 8 A A C 0 0 o 0

E 0 8 8 A A 1 5 - ~ v v

E C C 9 8 8 If

3 3 If If 2

3 1

2

E c

1 9 A A b B B 8 8 3 1 8 J 9 A A 9 9 A

0 C B 7 6 33 3 2 1 B A 8 6 3 2 3 3 2

gt- -25 - 3 5 6 7 8 9 8 9 9 1 2 5 5 6 1 1 8 8 8

A 9 2 1 5 2 1 2

1 2 2 2 1 3 3 3 2 1 -

5 6 6 5 5 6 7 1 1 6 222 2 3 3 3 2 1 3 5 6 6 6 5 5 5 5 5 If 3 1 122 3 3 2 1 3 5 6 6 5 5 3 If If 2 1 1 2 1 1 2 5 2 1 If 3 3 2 1 122 1

-50 - 1 233 3 2 1 222 1 -223 If 2 1 1 12 3 1 t

2 3 3 1 1 2 1

-75 ~ -

I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

35 ~ shy

I-r-

rshy -~ IJ 30 ~ shylaquo -a r-u shy -a laquo ~- shyIJ 25 l- I- I- shy0 -a - lshyw CD 20 I- shygt ~

-rshyz ~

- -15 - -~ ~ shyrshy

1-shy

r- 0 shy

rshy

-- -05 shy- Ishy

-

mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

~ 1 If 5 6 6 6 9 A B 0 0 0 lt- C B 9 7 5 If

2 3 5 6 6 7 8 A C 0 0 E 0 C B B A 9 7 5 1s ~

2 If If 5 6 7 9 A C 0 E o C 8 A A A 962 ~ o _0 3 5 6 -+-6--amp--e-9--fr~- ~--i---9--8-8 ~ ~ ~ ~ ~

Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

-50 - 332 -shy2 1

-75 1 - shy

1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

~25 shy

Ishy

Ishy~~ 20 shy

0 U Ishy0

r shyltt Ishy

lL ~o I-shylshy

~ Ishyffi 5 shyf-CD

~ gt z

- 0 shy-

05 shy

Ishy

~

h I I I o

10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

~

1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

1 3

1 1 2 2 2

1 3 3 3 3 1 3 2 If If 3 3 2 6 6 6 5 If 3 2

8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

-

--

-

-75 ~

--

-

1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

~

-shyz

10 ~ shy-

05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

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-75 - 2 3 2 1 -

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-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

-- -

Ishy

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IJ shylaquo 0 I- shyu ~ 0

laquo IJ

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2 - shy~ -f-

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I- shy

-

J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

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x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

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r shy

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rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

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bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

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-I -4-204791_ -

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FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

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bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

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o 10 20 30 40 50 60 70 80 90 100

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FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

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z ~ _- po vI o 0 ~ v v v ~ ~

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j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

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40 50

Il (nmil

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FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

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2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

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2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

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V w w ~ ~

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1 1

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bull bull

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X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

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--

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CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

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~ -r shy10 shy-- - r-

~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

zi a) HISTOGRAM

i ATe-80 ( 2 ) -z N 10 shyX ~ o - ~ ~ ~ ~~ ~ LU - ~~ ~~~ Z - ~~~ ~~~ ~ ~~~~ Z~ ~~ IL - ~~~~~~~~ ~~~~~ ~ ~ f ~~ ~ ~ ~ a - v~~ ~Y~~~~~y~~~~ o a - ~~~~~~~~~~~~~~~~~ ~ -~~~~~~~~~~~~~~~~~~~~ --~

-~~~Y~I~~~~~~~~~~ shyIL ~~~~~~~~~~v~V~~~~~~Y~vv~vvzv~o v~ ~ ~~ ~~ vJ a ~~~~~~~~~~~~~~~~~V ~~v~v~~~~~~~~~~LU ~~~~~~y~Z ~ ~l~~~~~~~~~~~~~~~~~CD ~~v~~ ~ ~ z~~~v~ Vf ~ ~~~~~~~~~~~E o ) z o 10 20 30 40 50 60

RANGE- (NMn

b) CUMULATIVE DISTRIBUTIONa LtJ C Z ~ a 100 TMF 8126X MEASUREMENT ~

~ IL UNIFORM-IN-RANGE MODEL4 a () 3 AIRCRAFTNM a 10 ~ IL o UNIFORM-IN-AREA MODEL a 01 AIRCRAFTNM2 LU CD E )z 1- ~__oIIL-L~ L__a___II_a_L_

2 5 10 20 50 RANGE R (NMn

Fig2 Range distribution of traffic -- LA Basin

4

--

t

~

-

between 10 and 50 nmi the data may be approximately described as uniform-inshyrange with density of 3 aircraftnmi

22 Variation with Time

221 Short-Term Variation

The results shown in Figs 1 and 2 were obtained by averaging over a period of 20 minutes Variations with time throughout that period are plotted in Figs 3 and 4 Figure 3 pertains to the traffic within a range of 10 nmi of the location of highest density and Fig 4 includes all traffic within 80 nmi of the TMF

The amount of variability in aircraft count is shown in Fig 5 in the form of the cumulative distribution and in Fig 6 as the standard deviation It might have been expected that the amount of variability would agree approxshyimately with Poisson statistics In the gas model used to represent air traffic in certain cases the probability distribution of aircraft count within any region is Poisson For a random variable with Poisson distribution the standard deviation is equal to the square root of the average value (Ref 5) This relationship is plotted in Fig 6 for comparison with the data It is evident that the measurements conform to the Poisson law to first order and yet the standard deviation of the measured data is consistently less than this simple rule Possible mechanisms for this difference are (1) the structure of air traffic due to ATC and (2) the shortness of the sample (20 min) which because of the fact that it takes about 10 to 60 minutes for individual aircraft to pass through the counting region generally tends to decrease the standard deviation of the sample relative to the longer term standard deviation

222 Day-to-Day Variation

In order to assess day-to-day variation TMF data tapes recorded on different days were processed Figure 7 shows a comparison of LA Basin results on four different days Although not all identical the results are seen to be similar The primary features mentioned above in connection with tape TMF8l26 (low density over ocean and mountains peak occurring around Long Beach etc) are evident in the other three days traffic as well TMF8l26 recorded on a Sunday exhibits the highest density among these four samples but not by a large factor

The Appendix gives more detailed computer outputs for these four TMF tapes The traffic density map and the range distribution histogram centered at the location of highest density are given for each case

5

40 NUMBER OF AIRCRAFT IN EACH SCAN

30

r-

hVERAGED OVER 40 sec

AVERAGED OVER 120 sec

~

rshylL ltt a u a ltt lL o a w CD ~ J Z

20

10

CENTER POINT RANGE 10 nmi

(-10 -10)

o 50 100 150 200 250 300

SCAN NUMBER

Fig~3 Time variation traffic in the LA area - peak location shy

6

150

I-La 125 lt a U a lt La 0 100

a ILl m ~ ~ Z 75

50 CENTER POINT TMF RANGE 80 nmi

25

l -4-204521_

a 50 100 150 200 250 300

SCAN NUMBER

Fig4 Time variation of traffic in the LA Basin - Total

7

ATC-SO (5)Lt o

TAPE TMF 8128 20 MIN 8AMitlE ~ Lt 100 ---------~-~~-----7__II~____ W-C_ 25middotNMIa-C RANGE-CO() LIMIT g~ Z-CO WI() degOm 50~---------6--+---------4~-G----+---ta--cWI vl~ wzzgt-raquo i=()Oc(ZOJc( 0i ~ 0-----j50a----1-0-0a----1-5-0-------20-0~

raquodeg INSTANTANEOUS NO OF AIRCRAFT

Fig5 Short term variability - Cumulative distribution of aircraft count

ATC-SO (6)

TAPE TMF 8128 20 MIN SAMPLE

o 20 z o ~ ltgt w c 10 c a lt c z LA BASIN lt MEASUREMENTS en

50 100 150 200

AVERAGE NO OF AIRCRAFT n

Fig6 Short term variability - Comparison between mean and standard deviation

8

flgtAIRCRAFT40 9 001 AIRCRAFT

09~ ~ 0 PER nmi2 003 2

0 9 ~~~ PEAK 007 PER nml 20

~ -= o z -20

E c

-40

-60 TMF 8046 TMF 8055 THURS 1630 PST 111176 MON 1230 PST 111576

40

20a 0 ~

0 s

0 ~ -z -20 E c ~ -40

-60 TMF 8122 TMF 8126 SAT 1400 PST 112076 SUN 130 PST 112176

-60 -40 -20 o 20 40 60 -60 -40 -20 o 20 40 60

X lnmi East Mag) X lnmi East Mag)

Fig7 Day-to-day comparison of LA Basin traffic

9

30 TRAFFIC IN OTHER LOCATIONS

Figures 8 9 and 10 present traffic density maps of respectively Washington DC Philadelphia and Boston As in Fig 1 the sYmbols plotted indicate the local density averaged over the region within 10 nmi of each point The Boston data was recorded with the TMF located at Deer Island a favorable site about 2 nmi east of Logan Airport This site was found to give excellent coverage of the airspace around Boston The Philadelphia data was recorded when the TMF was located near Clementon NJ a site about 15 nmi southeast of Philadelphia International Airport also providing excellent coverage

The Washington data in Fig 8 was recorded with the TMF located at Washington National Airport In this case it was found that an excessive number of targets were recorded at close range -- thought to be primarily false targets due to reflections and imperfect sidelobe suppression Because of this condition all targets with ranges less than 2 nmi were deleted prior to the computation of traffic densities This range filtering was done only in the case of the Washington data

Cumulative range distributions N(R) of aircraft plotted in Fig 11 permit comparisons to be made among sites and among different days at each site Each curve gives the range distribution relative to the location of maximum density The curve marked high density traffic model LAl is discussed in the next section

The day-to-day similarities in LA traffic discussed above in connection with Fig 7 are also apparent here with TMF8l26 having the maximum density It is also seen that TMF8l26 exhibits the maximum density among all of the tapes reduced regardless of location The results exhibit a moderate day-to-day repeatability in each location Although the curve shapes in Fig 11 are all similar certain differences may be noted For example N(lO nmi) results at Boston Philadelphia and Washington are all approximately equal and yet N(60 nmi) results exhibit appreciable differences with Philadelphia exceeding Washington and Washington exceeding Boston In other words the traffic density in Boston falls off rapidly away from the location of peak density while Washington and Philadelphia traffic densities falloff less rapidly In all three cases the distribution beyond 10 nmi is moderately well approximately by a uniform-in-range model with 1 to 2 aircraft per nmi (which is considerably less than the 3 aircraft per nmi of LA)

Density map comparisons showing day-to-day repeatability to Washington Philadelphia and Boston are given in Figs 12 13 and 14 Day-to-day changes in spatial distribution are more evident in the Philadelphia plots as compared with the other locations These changes may be the result of the

10

ATe-80 (8)

MEASUREMENT TMF 4039 MON 24 MAY 1976 1114-1134 EDT

- E

J a 0 z

40

20

0

1

1

1

I

s t

J 1 ( J r 1 ~

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7 ~

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8

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3

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t

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I t r ( ( ~ sshy f

( ~ S ~

-40 i S

-40 -20 a 20 40 60

X(NMI EAST MAG) KEY -

SYMBOL

123456189ABCDEFGHlJKLMNOPQRST i 11111111 IIIILi iii iii

0001 001 01 1

TRAFFIC DENSITY p (AIRCRAFTINMl2)

Fig8 Traffic density map Washington DC

11

ATe-80 (9)

MEASUREMENT TMF 5026 THURS 24 JUNE 1976 1358-1428 EDTshy

r 7 t bull or r I 7 1 9 q

40

1 z20 3

r r r o

r r r r

Z~

4

3 4

4

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X(NMI EASTMAGJ

KEY shySYMBOL

1234 56789ABCOE FGH IJ KLMNOPQRST 11111111 IIIILI ~I iii bull ~I

0001 001 01 1

TRAFFIC DENSITYp CAIRCRAFTNMI2)

Fig9 Traffic density map Philadelphia

12

ATe-so (10)

MEASUREMENT TMF 3037 MON 29 MARCH1976 1541-1559 EST

I bull

- ~

lt ~

I t-a 0 Z

i z-gtshy

40

20

O

-20

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1 r 7

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1 7 7 1 ~ 1 p Il shy--------shy7 7 If ~ to ~ ( bull ~--I

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l bull Z 1

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XCNMI EAST MAGJ

KEY -SYMBOL

12345678 9ABCDE FGH I J K LMNOPQRS T I I I I I I I I I I I I I l-I i i i V

0001 001 01 1

TRAFFIC DENSITYp (AlRCRAFTNMl2 )

FigIO Traffic density map Boston

13

1000

l18-4-19158 L LA HIGH DENSITY

TRAFFIC MODEL LA

0

W () Z ~ 0

Z I 100 t shy

~

t shy~

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Fig11 Traffic distributions

bull J

6-----

50 100

in range

14

(

CI ~ ~

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Fig12

40

20

0

-40 TMF 4001 THURS MAY 6 1976

40

20

-20

-40

40

20

TMF 4045 FRI MAY 28 1976

-60 -40 -20

-40

-20

C42-1705

1600 EDT

40

1300 EDT

0 20 40 60

x (nmi EAST OF TMF MAG)

Day-to-day comparison of Washington traffic

15

C42-1706

40

20

O~---+---++W---------i

-20 )

TMF 5005 -40 TUES JUNE 15 1976 1000 EDT

C)

lt 4i

u i 0 ~

I a 0 z E c

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40

20

O~---f--l~_~----------l

-20

-40

x (nml EAST OF TMF MAG)

Fig 13 Day-to-day comparison of Philadelphia traffic

16

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

-~Z 30 I- shyf shy

-~ lL ltX f- - shya U a lti I- shy

lL 20 ~ I--

shyo a -- f-_ w -00 ~ -I shy -shyJ shyZ

I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

-1-4-20460 shy

fshy -

-50

~

cshy o Z

E c

50

o

f shy

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I

2

I

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I 1 3 t 3 1 1

1 3 t 6 7 5 3 3 2 5 t 5 7 A A A 9 6 I 6

6 9 8 C 0 C A 6 3 5 7 C C E F E 0 8 9 8 C

2 7 9 C E G G G F 0 0 0 E 5 8 8 o E F G H G E E F F 7 9 Il euro --iH-6 II 6 amp--shy7 8 9 8 8 0 F G H I I I I 5 7 8 8 8 9 8 F H I J J J I 3 I I 3 2 3 C F r J J J

9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

I 5 6 5 2 3 3 2

I

I I I 2 I

I 2 3 2 I 2 2 2 t t 3 2

2 2 3 t ~ 6 r 2 2 2 3 3 5 6 D t I

6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

6 F F E [)-euro-- euro--iHt-amp---tr--6--tr-4 H G F E C C A A 9 7 6 6 6 6 I

I H l 0 8 A987t3t31 H G F C A 66132 G F E C 9 I 232 0 0 C C 8 9 7 2 ~ 5 I

9 8 C C C 8 A 8 7 7 6 t

5 8 A C C C 8 8 A 8 8 6 1

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1 3 5 6 7 9 8 8 B B 7 6 I

3 I 6 9 B B 9 8 5 3 3 5 7 9 9 9 6 3

1 1 I 3 6 7 6 3 1 I

I ~

-

-

-

-

- -

-100

I I

-50 I

o I I

50

I

taO

X (nmi East 1 Mag)

FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

E

c CJ

7 ~ shyI I shyU ~

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z ~ - - shy

3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

2 If 6 888 8 C C 9 6 t 3 If A C 0 o C 8 8 It 8 8 7 6 6 6 If

2 t 7 9 888 DEE C A A It 8 E F F F 0 C 8 A A A 9 7 7 6 If 2 rshy~

o Z

0

2 5 8 9 ABC 0 E F FED 0 o E 379 A ceo 0 E F G G F G F F- - - - -

If 8 9 9 Ace 0 F F H H H H H

G G G G E 0 B A A A 9 9 8 7 5 G H G F E C A B 8 A 9 8 8 6 5

- r v bull v

H G FEe C A A 9 7 656 5 5

2

E c-

2 6 8 8 A A 8 C E G H I I 3lf5776AE G H I

I I

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H F C 8 899 7 6 2 1 If H G C 9 776 2

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1 3

1 2 1 8 E F G H H GEe 9 5 5 2 gt- - 25 - 3 A C C 0 F E 0 C It A 8 5 5 5 2 -

5 8 8 7 A B 888 A A 9 7 6 3 If 6 6 1 6 9 A 8 8 8 A 8 5 1 2 5 If 1 1 2 7 A 8 B 8 8 5 2

2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

~7 shy

r-

t- ~~

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lti r shy

~

0 ~

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~

shyw CD ~ - shygt -

4 shyz fshy -

rshy

-1--shy~ -

I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

75

I 2 2 I 3 J 2

2 + + 3 2 50 2 5 5 At J

I 3 2 I 2 + 5 5 5 2 3 At At At 3 + 5 Igt 5 + 1 1

I 3 5 6 6 7 Igt 8 5 5 3 I 2 3 2 1 2 3 At 6 8 8 8 1 2 Igt 8 8 l 2 I I + J I

25 I 2 2 5 A B A 1 Igt 1 7 1 5 5 6 Igt 5 3 1 2 3 3 1 CO D I I I At 8 A C C 8 8 + 3 I A 8 8 8 A 8 1 5 5 Igt 8 7 7 5 2 2 2 3 6 9 B C E E 0 C 9 8 A 0 0 0 0 8 A 1 Igt 1 1 8 8 7 5 2 ~ 2 At It 6 8 A C E F F F E 0 C C E F E 0 A 9 Igt Igt 7 7 7 7 5 1 ~ 0 Z

a 2 It

It

5

6

6

7

8

8

8

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B C E F H I H GEE -++-t-j-fmiddot-~ oF-

A B C F H r J I H G

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8

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9

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7

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6

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3

9 A A D G I I r I 4

7 8 9 9 0 G H H 11

66669CE G 2 + At + 7 9 A A C 0

G E C 1 G E f A

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5

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5 5 + 3

3 3 2 2

I 3 + 5 1 9 9 9 8 A II A A II A 9 7 5 5 5 + I I I 3 + 5 7 8 8 9 8 r 889 A A ~ 8 8 7 5 1

2 3 3 + 6 Igt Igt 7 8 9 8 5 2 l 1 9 A A 9 7 5 I

2 3 3 57768A4 A I J 5 9 A 8 1 5

-50 2 3 I

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7 Igt

7 5 5

7 1

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8

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9

A

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8

1

8

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6 b

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7 9

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9

9 7

9 7 t

6 1

I + 5 5 Igt 7 II 8 7 7 b b 7 Igt It

I J J I b b i) b b b 5 J -75 1 3 + 5 I 1

I I 2

~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

-

7 CENTERPOINT -20 nmi -5 nmi -

6 - -rshylL

r shy _

lt -0 U 0 5 - -lt

lL _ r-

o -0 W 4 - -CD ~ ~ r-

z -

shy--

2 fshy -- -

rshy -

1-shyI--~-

-

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

Ishy

~-

t -75

-50

25

gt- -25

r-o 0 z

E c

1

1 1 2

A bull amp

1

2 2 2 1 If

2

2 2 2 2 4f

If bull

2

1

3 2 4f

5 1 V

4f

3

1 2 2 5 5 1 8 A V

6 If 2

1 2 1 1 3 3 2 2 1 7 3 2 2 2 2 5 6 6 5 3 1 6 7 7 3 2 3 2 2 1 6 8 9 9 8 4f 1 6 6 7 3 5 4f 4f 4f 1 1 7 9 B B A 8 poundf 2 3 At 9 7 8 8 8 6 6 At 4f 5 6 7 8 A C 0 C B 9 8 A A C 0 C 8 B 9 8 1 1 1 1 8 9 B C 0 0 0 0 C C 0 E E E o D B A 9 8 1 1 1 9 A C E F F E 0 E E F F E E 0 C 8 A 8 1 6 6 A - - shy - r _ A

V V V V

1 8 B E F G G G G G o C C B B 8 A 9 1 5 3 3 5 6 8 C F G G H H H G F 0 C 8 8 A 9 1 At 2 1 3 If 5 9 0 F G H H I H G F C C 8 9 8 6 3 2 L 3 6 A C E F Ii H H G E C 8 A 9 1 6 3

2 2 It 7 9 8 C 0 E F F 0 C B A 9 9 7 6 1 2 3 If 6 7 7 8 9 C C B A A B A A 8 7 5

1 2 If 5 6 6 7 7 8 8 9 9 A A 8 8 A 9 5 1 1 2 5 5 6 6 6 7 7 7 1 9 A 8 8 B 8 3

3 It If It At At If 5 5 6 8 A A A 9 3 1 2 2 2 2 1 2 3 t 6 8 A A 8 t

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4f 3 ~

1

1 1

-

-

-

-

I I I J I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-7 LA map TMF8055

A-9

- -

8 I I r- r J I I I

--4-20467 L ~7 shy

I shy

I- CENTERPOINT -5 nmi -15 nmi _6 ~

f shy

~shy 5 shy

IJ I- shyltX ~

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l- f shy0 W CD ~ ~ ~ ~ z 3 - - shy

-rshy

~ f-f- shy2 - shy

-f- shy

~ ~-~ -I shy

- nTh+-_ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

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5 6 5 6 A 0 f E 0 C 8 C C 8 9 6 5 5 5 3 1 ~ 2 If 5 5 1 C E F F E o C 8 8 8 9 1 5 5 3 3 2

Lshy~

o z

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1 1 8 A A C 0 0 o 0

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E C C 9 8 8 If

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0 C B 7 6 33 3 2 1 B A 8 6 3 2 3 3 2

gt- -25 - 3 5 6 7 8 9 8 9 9 1 2 5 5 6 1 1 8 8 8

A 9 2 1 5 2 1 2

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-50 - 1 233 3 2 1 222 1 -223 If 2 1 1 12 3 1 t

2 3 3 1 1 2 1

-75 ~ -

I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

35 ~ shy

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1-shy

r- 0 shy

rshy

-- -05 shy- Ishy

-

mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

~ 1 If 5 6 6 6 9 A B 0 0 0 lt- C B 9 7 5 If

2 3 5 6 6 7 8 A C 0 0 E 0 C B B A 9 7 5 1s ~

2 If If 5 6 7 9 A C 0 E o C 8 A A A 962 ~ o _0 3 5 6 -+-6--amp--e-9--fr~- ~--i---9--8-8 ~ ~ ~ ~ ~

Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

-50 - 332 -shy2 1

-75 1 - shy

1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

~25 shy

Ishy

Ishy~~ 20 shy

0 U Ishy0

r shyltt Ishy

lL ~o I-shylshy

~ Ishyffi 5 shyf-CD

~ gt z

- 0 shy-

05 shy

Ishy

~

h I I I o

10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

~

1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

1 3

1 1 2 2 2

1 3 3 3 3 1 3 2 If If 3 3 2 6 6 6 5 If 3 2

8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

-

--

-

-75 ~

--

-

1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

~

-shyz

10 ~ shy-

05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

0 --

3 5

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6

7

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-75 - 2 3 2 1 -

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-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

-- -

Ishy

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IJ shylaquo 0 I- shyu ~ 0

laquo IJ

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2 - shy~ -f-

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~ shy

I- shy

-

J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

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-75 Ishy

2 2 I I -I

I I I I I I

-100 -75 -50 -25 o 25 50 75 100 bull

x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

I I lr- I I I I

l-4-204771_ 45 I- r- shy

r shy

~ ~ - CENTER POINT 020 nmi ~r-40 - shy-

shy-r-shy

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rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

3 pound+ It 6 8 8 8 1 e 5 3 1 5 1 1 8 8 6 pound+

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2 3 5 8 lt) A lt) 7 6 pound+ 1 8 8 1 5 7 8 8 lt) lt) 1 6 3 ~ 3 5 6 7 7 lt) lt) A A 7 5 3 1 6 8 lt) 7 5 3 5 8 lt) lt) lt) 7 3

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0 0

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1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

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n CENTER POINT 0 10

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rh 90 100

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FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

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r 50

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ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

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bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

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l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

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r-

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o 10 20 30 40 50 60 70 80 90 100

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FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

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-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

--

CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

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40 50

Il (nmil

60

I

70 I

80

I

90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

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1 1

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-100 I

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-50 -25 0 25

X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

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to-LL laquo - shy200 Ua 4

LL 0

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I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

--

t

~

-

between 10 and 50 nmi the data may be approximately described as uniform-inshyrange with density of 3 aircraftnmi

22 Variation with Time

221 Short-Term Variation

The results shown in Figs 1 and 2 were obtained by averaging over a period of 20 minutes Variations with time throughout that period are plotted in Figs 3 and 4 Figure 3 pertains to the traffic within a range of 10 nmi of the location of highest density and Fig 4 includes all traffic within 80 nmi of the TMF

The amount of variability in aircraft count is shown in Fig 5 in the form of the cumulative distribution and in Fig 6 as the standard deviation It might have been expected that the amount of variability would agree approxshyimately with Poisson statistics In the gas model used to represent air traffic in certain cases the probability distribution of aircraft count within any region is Poisson For a random variable with Poisson distribution the standard deviation is equal to the square root of the average value (Ref 5) This relationship is plotted in Fig 6 for comparison with the data It is evident that the measurements conform to the Poisson law to first order and yet the standard deviation of the measured data is consistently less than this simple rule Possible mechanisms for this difference are (1) the structure of air traffic due to ATC and (2) the shortness of the sample (20 min) which because of the fact that it takes about 10 to 60 minutes for individual aircraft to pass through the counting region generally tends to decrease the standard deviation of the sample relative to the longer term standard deviation

222 Day-to-Day Variation

In order to assess day-to-day variation TMF data tapes recorded on different days were processed Figure 7 shows a comparison of LA Basin results on four different days Although not all identical the results are seen to be similar The primary features mentioned above in connection with tape TMF8l26 (low density over ocean and mountains peak occurring around Long Beach etc) are evident in the other three days traffic as well TMF8l26 recorded on a Sunday exhibits the highest density among these four samples but not by a large factor

The Appendix gives more detailed computer outputs for these four TMF tapes The traffic density map and the range distribution histogram centered at the location of highest density are given for each case

5

40 NUMBER OF AIRCRAFT IN EACH SCAN

30

r-

hVERAGED OVER 40 sec

AVERAGED OVER 120 sec

~

rshylL ltt a u a ltt lL o a w CD ~ J Z

20

10

CENTER POINT RANGE 10 nmi

(-10 -10)

o 50 100 150 200 250 300

SCAN NUMBER

Fig~3 Time variation traffic in the LA area - peak location shy

6

150

I-La 125 lt a U a lt La 0 100

a ILl m ~ ~ Z 75

50 CENTER POINT TMF RANGE 80 nmi

25

l -4-204521_

a 50 100 150 200 250 300

SCAN NUMBER

Fig4 Time variation of traffic in the LA Basin - Total

7

ATC-SO (5)Lt o

TAPE TMF 8128 20 MIN 8AMitlE ~ Lt 100 ---------~-~~-----7__II~____ W-C_ 25middotNMIa-C RANGE-CO() LIMIT g~ Z-CO WI() degOm 50~---------6--+---------4~-G----+---ta--cWI vl~ wzzgt-raquo i=()Oc(ZOJc( 0i ~ 0-----j50a----1-0-0a----1-5-0-------20-0~

raquodeg INSTANTANEOUS NO OF AIRCRAFT

Fig5 Short term variability - Cumulative distribution of aircraft count

ATC-SO (6)

TAPE TMF 8128 20 MIN SAMPLE

o 20 z o ~ ltgt w c 10 c a lt c z LA BASIN lt MEASUREMENTS en

50 100 150 200

AVERAGE NO OF AIRCRAFT n

Fig6 Short term variability - Comparison between mean and standard deviation

8

flgtAIRCRAFT40 9 001 AIRCRAFT

09~ ~ 0 PER nmi2 003 2

0 9 ~~~ PEAK 007 PER nml 20

~ -= o z -20

E c

-40

-60 TMF 8046 TMF 8055 THURS 1630 PST 111176 MON 1230 PST 111576

40

20a 0 ~

0 s

0 ~ -z -20 E c ~ -40

-60 TMF 8122 TMF 8126 SAT 1400 PST 112076 SUN 130 PST 112176

-60 -40 -20 o 20 40 60 -60 -40 -20 o 20 40 60

X lnmi East Mag) X lnmi East Mag)

Fig7 Day-to-day comparison of LA Basin traffic

9

30 TRAFFIC IN OTHER LOCATIONS

Figures 8 9 and 10 present traffic density maps of respectively Washington DC Philadelphia and Boston As in Fig 1 the sYmbols plotted indicate the local density averaged over the region within 10 nmi of each point The Boston data was recorded with the TMF located at Deer Island a favorable site about 2 nmi east of Logan Airport This site was found to give excellent coverage of the airspace around Boston The Philadelphia data was recorded when the TMF was located near Clementon NJ a site about 15 nmi southeast of Philadelphia International Airport also providing excellent coverage

The Washington data in Fig 8 was recorded with the TMF located at Washington National Airport In this case it was found that an excessive number of targets were recorded at close range -- thought to be primarily false targets due to reflections and imperfect sidelobe suppression Because of this condition all targets with ranges less than 2 nmi were deleted prior to the computation of traffic densities This range filtering was done only in the case of the Washington data

Cumulative range distributions N(R) of aircraft plotted in Fig 11 permit comparisons to be made among sites and among different days at each site Each curve gives the range distribution relative to the location of maximum density The curve marked high density traffic model LAl is discussed in the next section

The day-to-day similarities in LA traffic discussed above in connection with Fig 7 are also apparent here with TMF8l26 having the maximum density It is also seen that TMF8l26 exhibits the maximum density among all of the tapes reduced regardless of location The results exhibit a moderate day-to-day repeatability in each location Although the curve shapes in Fig 11 are all similar certain differences may be noted For example N(lO nmi) results at Boston Philadelphia and Washington are all approximately equal and yet N(60 nmi) results exhibit appreciable differences with Philadelphia exceeding Washington and Washington exceeding Boston In other words the traffic density in Boston falls off rapidly away from the location of peak density while Washington and Philadelphia traffic densities falloff less rapidly In all three cases the distribution beyond 10 nmi is moderately well approximately by a uniform-in-range model with 1 to 2 aircraft per nmi (which is considerably less than the 3 aircraft per nmi of LA)

Density map comparisons showing day-to-day repeatability to Washington Philadelphia and Boston are given in Figs 12 13 and 14 Day-to-day changes in spatial distribution are more evident in the Philadelphia plots as compared with the other locations These changes may be the result of the

10

ATe-80 (8)

MEASUREMENT TMF 4039 MON 24 MAY 1976 1114-1134 EDT

- E

J a 0 z

40

20

0

1

1

1

I

s t

J 1 ( J r 1 ~

- -- L 1 Sshy f 4 6 pound J ( f c~~j

I ~ i f

~ ~l l C D I bull A C- 1gt

7 ~

~ 4 45 bull bull ~ ~ 1 1 amp

3 1 I

t 7 s f 1 r 1 f 9

c ~c

bull ~

bull t

8

4shy

3

4shy

J

7

1

z

I

1

~

t

Z 1

~ Z ~

gtshy-20

I t r ( ( ~ sshy f

( ~ S ~

-40 i S

-40 -20 a 20 40 60

X(NMI EAST MAG) KEY -

SYMBOL

123456189ABCDEFGHlJKLMNOPQRST i 11111111 IIIILi iii iii

0001 001 01 1

TRAFFIC DENSITY p (AIRCRAFTINMl2)

Fig8 Traffic density map Washington DC

11

ATe-80 (9)

MEASUREMENT TMF 5026 THURS 24 JUNE 1976 1358-1428 EDTshy

r 7 t bull or r I 7 1 9 q

40

1 z20 3

r r r o

r r r r

Z~

4

3 4

4

-gt -20 ~

r I I

I

7 J 11 I I shy __ - I I

1tN6E ur _ I P~UNIamp--71IIS ~s_ 1

-60 -4Q -20 o 20 40 60

X(NMI EASTMAGJ

KEY shySYMBOL

1234 56789ABCOE FGH IJ KLMNOPQRST 11111111 IIIILI ~I iii bull ~I

0001 001 01 1

TRAFFIC DENSITYp CAIRCRAFTNMI2)

Fig9 Traffic density map Philadelphia

12

ATe-so (10)

MEASUREMENT TMF 3037 MON 29 MARCH1976 1541-1559 EST

I bull

- ~

lt ~

I t-a 0 Z

i z-gtshy

40

20

O

-20

-40

1 r 7

f r 7

~ -f r r 6 I

1 -f 1 ~ 7 if 1

~ ~ ~ 1 ( 1 t

I I 7 7 -A A

I -shy

1 1 8 e 1)

I

1 7 I~

~ bull UJHtN

I IVTAlIshy I

1 7 7 1 ~ 1 p Il shy--------shy7 7 If ~ to ~ ( bull ~--I

11 f7 1 A (

1 ~ A 1 bull 1---

r

f

1

if

bull 6shy

V

l bull Z 1

r z

I z

I

~~c~AFr I yM L I

J I I

I I

z 4 llfmiddot

J l~~

~Ifv1~

-40 -20 0 20 40

XCNMI EAST MAGJ

KEY -SYMBOL

12345678 9ABCDE FGH I J K LMNOPQRS T I I I I I I I I I I I I I l-I i i i V

0001 001 01 1

TRAFFIC DENSITYp (AlRCRAFTNMl2 )

FigIO Traffic density map Boston

13

1000

l18-4-19158 L LA HIGH DENSITY

TRAFFIC MODEL LA

0

W () Z ~ 0

Z I 100 t shy

~

t shy~

~ 0 U Q

ltt ~

o Q W m ~ 10 Z

w () ~ Q W

~

1 _---_--1_6---1-- shy

201052

RANGE R (nmi)

Fig11 Traffic distributions

bull J

6-----

50 100

in range

14

(

CI ~ ~

~

=E ~

IL 0 z ~ a ~

E c

gtshy

Ishy

Fig12

40

20

0

-40 TMF 4001 THURS MAY 6 1976

40

20

-20

-40

40

20

TMF 4045 FRI MAY 28 1976

-60 -40 -20

-40

-20

C42-1705

1600 EDT

40

1300 EDT

0 20 40 60

x (nmi EAST OF TMF MAG)

Day-to-day comparison of Washington traffic

15

C42-1706

40

20

O~---+---++W---------i

-20 )

TMF 5005 -40 TUES JUNE 15 1976 1000 EDT

C)

lt 4i

u i 0 ~

I a 0 z E c

~

40

20

O~---f--l~_~----------l

-20

-40

x (nml EAST OF TMF MAG)

Fig 13 Day-to-day comparison of Philadelphia traffic

16

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

-~Z 30 I- shyf shy

-~ lL ltX f- - shya U a lti I- shy

lL 20 ~ I--

shyo a -- f-_ w -00 ~ -I shy -shyJ shyZ

I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

-1-4-20460 shy

fshy -

-50

~

cshy o Z

E c

50

o

f shy

~

I

2

I

I I

I 1 3 t 3 1 1

1 3 t 6 7 5 3 3 2 5 t 5 7 A A A 9 6 I 6

6 9 8 C 0 C A 6 3 5 7 C C E F E 0 8 9 8 C

2 7 9 C E G G G F 0 0 0 E 5 8 8 o E F G H G E E F F 7 9 Il euro --iH-6 II 6 amp--shy7 8 9 8 8 0 F G H I I I I 5 7 8 8 8 9 8 F H I J J J I 3 I I 3 2 3 C F r J J J

9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

I 5 6 5 2 3 3 2

I

I I I 2 I

I 2 3 2 I 2 2 2 t t 3 2

2 2 3 t ~ 6 r 2 2 2 3 3 5 6 D t I

6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

6 F F E [)-euro-- euro--iHt-amp---tr--6--tr-4 H G F E C C A A 9 7 6 6 6 6 I

I H l 0 8 A987t3t31 H G F C A 66132 G F E C 9 I 232 0 0 C C 8 9 7 2 ~ 5 I

9 8 C C C 8 A 8 7 7 6 t

5 8 A C C C 8 8 A 8 8 6 1

6 7 9 8 C C 8 A 9 8 6 t

1 3 5 6 7 9 8 8 B B 7 6 I

3 I 6 9 B B 9 8 5 3 3 5 7 9 9 9 6 3

1 1 I 3 6 7 6 3 1 I

I ~

-

-

-

-

- -

-100

I I

-50 I

o I I

50

I

taO

X (nmi East 1 Mag)

FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

E

c CJ

7 ~ shyI I shyU ~

ltt ~ -shyw Z I- shy

6 l- shy l shylJ I shyltt a

~ u I- shy5a ~-

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shya 4 ~

W CD

~

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z ~ - - shy

3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

2 If 6 888 8 C C 9 6 t 3 If A C 0 o C 8 8 It 8 8 7 6 6 6 If

2 t 7 9 888 DEE C A A It 8 E F F F 0 C 8 A A A 9 7 7 6 If 2 rshy~

o Z

0

2 5 8 9 ABC 0 E F FED 0 o E 379 A ceo 0 E F G G F G F F- - - - -

If 8 9 9 Ace 0 F F H H H H H

G G G G E 0 B A A A 9 9 8 7 5 G H G F E C A B 8 A 9 8 8 6 5

- r v bull v

H G FEe C A A 9 7 656 5 5

2

E c-

2 6 8 8 A A 8 C E G H I I 3lf5776AE G H I

I I

I I

H F C 8 899 7 6 2 1 If H G C 9 776 2

If

1 3

1 2 1 8 E F G H H GEe 9 5 5 2 gt- - 25 - 3 A C C 0 F E 0 C It A 8 5 5 5 2 -

5 8 8 7 A B 888 A A 9 7 6 3 If 6 6 1 6 9 A 8 8 8 A 8 5 1 2 5 If 1 1 2 7 A 8 B 8 8 5 2

2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

~7 shy

r-

t- ~~

~ ltt a 6 ~ shyu 0 r-I shy

lti r shy

~

0 ~

5 shyr-a

~

shyw CD ~ - shygt -

4 shyz fshy -

rshy

-1--shy~ -

I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

75

I 2 2 I 3 J 2

2 + + 3 2 50 2 5 5 At J

I 3 2 I 2 + 5 5 5 2 3 At At At 3 + 5 Igt 5 + 1 1

I 3 5 6 6 7 Igt 8 5 5 3 I 2 3 2 1 2 3 At 6 8 8 8 1 2 Igt 8 8 l 2 I I + J I

25 I 2 2 5 A B A 1 Igt 1 7 1 5 5 6 Igt 5 3 1 2 3 3 1 CO D I I I At 8 A C C 8 8 + 3 I A 8 8 8 A 8 1 5 5 Igt 8 7 7 5 2 2 2 3 6 9 B C E E 0 C 9 8 A 0 0 0 0 8 A 1 Igt 1 1 8 8 7 5 2 ~ 2 At It 6 8 A C E F F F E 0 C C E F E 0 A 9 Igt Igt 7 7 7 7 5 1 ~ 0 Z

a 2 It

It

5

6

6

7

8

8

8

9

B C E F H I H GEE -++-t-j-fmiddot-~ oF-

A B C F H r J I H G

F FEe 8 9-9- f Dell a 8 9

8

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7

9

1

8

7

8

6

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7 8 Igt 7 It 5

3

9 A A D G I I r I 4

7 8 9 9 0 G H H 11

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G E C 1 G E f A

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5

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7 7 5

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5 5 + 3

3 3 2 2

I 3 + 5 1 9 9 9 8 A II A A II A 9 7 5 5 5 + I I I 3 + 5 7 8 8 9 8 r 889 A A ~ 8 8 7 5 1

2 3 3 + 6 Igt Igt 7 8 9 8 5 2 l 1 9 A A 9 7 5 I

2 3 3 57768A4 A I J 5 9 A 8 1 5

-50 2 3 I

3 5 2

Igt 5 1

7 Igt

7 5 5

7 1

Igt

9 9

8

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9

A

B

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8

1

8

5

1 J 5

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If

6 b

(I A II

7 9

A II

9

9 7

9 7 t

6 1

I + 5 5 Igt 7 II 8 7 7 b b 7 Igt It

I J J I b b i) b b b 5 J -75 1 3 + 5 I 1

I I 2

~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

-

7 CENTERPOINT -20 nmi -5 nmi -

6 - -rshylL

r shy _

lt -0 U 0 5 - -lt

lL _ r-

o -0 W 4 - -CD ~ ~ r-

z -

shy--

2 fshy -- -

rshy -

1-shyI--~-

-

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

Ishy

~-

t -75

-50

25

gt- -25

r-o 0 z

E c

1

1 1 2

A bull amp

1

2 2 2 1 If

2

2 2 2 2 4f

If bull

2

1

3 2 4f

5 1 V

4f

3

1 2 2 5 5 1 8 A V

6 If 2

1 2 1 1 3 3 2 2 1 7 3 2 2 2 2 5 6 6 5 3 1 6 7 7 3 2 3 2 2 1 6 8 9 9 8 4f 1 6 6 7 3 5 4f 4f 4f 1 1 7 9 B B A 8 poundf 2 3 At 9 7 8 8 8 6 6 At 4f 5 6 7 8 A C 0 C B 9 8 A A C 0 C 8 B 9 8 1 1 1 1 8 9 B C 0 0 0 0 C C 0 E E E o D B A 9 8 1 1 1 9 A C E F F E 0 E E F F E E 0 C 8 A 8 1 6 6 A - - shy - r _ A

V V V V

1 8 B E F G G G G G o C C B B 8 A 9 1 5 3 3 5 6 8 C F G G H H H G F 0 C 8 8 A 9 1 At 2 1 3 If 5 9 0 F G H H I H G F C C 8 9 8 6 3 2 L 3 6 A C E F Ii H H G E C 8 A 9 1 6 3

2 2 It 7 9 8 C 0 E F F 0 C B A 9 9 7 6 1 2 3 If 6 7 7 8 9 C C B A A B A A 8 7 5

1 2 If 5 6 6 7 7 8 8 9 9 A A 8 8 A 9 5 1 1 2 5 5 6 6 6 7 7 7 1 9 A 8 8 B 8 3

3 It If It At At If 5 5 6 8 A A A 9 3 1 2 2 2 2 1 2 3 t 6 8 A A 8 t

2 t 6 9 8 A 8 5 1 I 3 3 3 8 9 9 A 7 At

I 1 3 It t 1 1 8 8 3 1 2 3 If 2 1 5 6

I 1 1

7 8 7 7

3

5 6 6

5

2

3 At

4f 3 ~

1

1 1

-

-

-

-

I I I J I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-7 LA map TMF8055

A-9

- -

8 I I r- r J I I I

--4-20467 L ~7 shy

I shy

I- CENTERPOINT -5 nmi -15 nmi _6 ~

f shy

~shy 5 shy

IJ I- shyltX ~

n u I shyn

I shyltX r- r shy

~ ~- shyIJ o

l- f shy0 W CD ~ ~ ~ ~ z 3 - - shy

-rshy

~ f-f- shy2 - shy

-f- shy

~ ~-~ -I shy

- nTh+-_ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

2 3 3 6 1 881 665 6 6 6 6 It 1 1 3 5 6 1 8 9 981 888 8 1 1 6 ~

1 1 1 3 5 8 A 8 8 988 999 9 1 5 3 1 1 3 3 1 1 3 5 6 9 8 C D 989 A A 9 8 5 2 3 3 3 2

25 - 1 3 5 5 2 2 3 6 9 C o U A 9 A A 8 9 6 If 2 3 4f It 3 -1 3 5 5 6 5 1 A C o 0 888 889 6 If It 2

5 6 5 6 A 0 f E 0 C 8 C C 8 9 6 5 5 5 3 1 ~ 2 If 5 5 1 C E F F E o C 8 8 8 9 1 5 5 3 3 2

Lshy~

o z

0 1 1 12236 8 0 F F F E shy bull v

1 1 8 A A C 0 0 o 0

E 0 8 8 A A 1 5 - ~ v v

E C C 9 8 8 If

3 3 If If 2

3 1

2

E c

1 9 A A b B B 8 8 3 1 8 J 9 A A 9 9 A

0 C B 7 6 33 3 2 1 B A 8 6 3 2 3 3 2

gt- -25 - 3 5 6 7 8 9 8 9 9 1 2 5 5 6 1 1 8 8 8

A 9 2 1 5 2 1 2

1 2 2 2 1 3 3 3 2 1 -

5 6 6 5 5 6 7 1 1 6 222 2 3 3 3 2 1 3 5 6 6 6 5 5 5 5 5 If 3 1 122 3 3 2 1 3 5 6 6 5 5 3 If If 2 1 1 2 1 1 2 5 2 1 If 3 3 2 1 122 1

-50 - 1 233 3 2 1 222 1 -223 If 2 1 1 12 3 1 t

2 3 3 1 1 2 1

-75 ~ -

I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

35 ~ shy

I-r-

rshy -~ IJ 30 ~ shylaquo -a r-u shy -a laquo ~- shyIJ 25 l- I- I- shy0 -a - lshyw CD 20 I- shygt ~

-rshyz ~

- -15 - -~ ~ shyrshy

1-shy

r- 0 shy

rshy

-- -05 shy- Ishy

-

mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

~ 1 If 5 6 6 6 9 A B 0 0 0 lt- C B 9 7 5 If

2 3 5 6 6 7 8 A C 0 0 E 0 C B B A 9 7 5 1s ~

2 If If 5 6 7 9 A C 0 E o C 8 A A A 962 ~ o _0 3 5 6 -+-6--amp--e-9--fr~- ~--i---9--8-8 ~ ~ ~ ~ ~

Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

-50 - 332 -shy2 1

-75 1 - shy

1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

~25 shy

Ishy

Ishy~~ 20 shy

0 U Ishy0

r shyltt Ishy

lL ~o I-shylshy

~ Ishyffi 5 shyf-CD

~ gt z

- 0 shy-

05 shy

Ishy

~

h I I I o

10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

~

1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

1 3

1 1 2 2 2

1 3 3 3 3 1 3 2 If If 3 3 2 6 6 6 5 If 3 2

8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

-

--

-

-75 ~

--

-

1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

~

-shyz

10 ~ shy-

05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

0 --

3 5

- shy6 5 5

6

7

7

-9

A

A

n

A 8

n

8

9

8

n

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9

-9 9

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9

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8

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shy

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6 3

6 6

7 6

8 8

9

8 8 8

8

9 7 8

7 8

9

9 A A

C 8 C 0

8 0

A

8 9 9

8 7

6 3

2 2

2

2

2

2

2 2 2 3 1

1 1 If 5 7 9 8 C 8 8 9 9 C C 8 A 7 3 1 1 gtshy -25 ~ 1 1 2 7 A C C C 8 A A 9 8 8 9 6 -

2 3 3 3 If 6 A C C C A A 9 9 9 9 5 2 3 If 5 5 6 9 8 8 A 8 8 8 9 7 If

2 If 6 6 6 6 7 8 8 7 5 5 7 7 5 3 2 If 6 6 6 5 If 6 6 5 6 6 7 6 If

-50 ~ If 5 6 5 2 3 5 6 8 7 7 3 -2 If If 2 5 7 8 7 6

1 3 6 T 7 6 If

1 3 If 6 6 6 If

2 If 5 5 If 2

-75 - 2 3 2 1 -

I I ~J I 1 I i I I A shy

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

-- -

Ishy

-4 shy- shy

IJ shylaquo 0 I- shyu ~ 0

laquo IJ

3 - shy~ 0 f- shy-0 - l- I-- IshyIJJ shyCD - E I-lshygt shyz

2 - shy~ -f-

-fshy -

~ shy

I- shy

-

J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

Lshy ~

o Z

0

3 2 ~ 1

5 f ~ 2

5 5

l

6 5

1

6 6

1

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6 8

9 9 ~

9

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U

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8 8 C

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C 8 A A A A 8 5 5 5 5 5 5 + 3

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1 2

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f

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3

3 It 6 6 6 6 7 8 A amp 8 8 A A A 9 9 9 8 i 6 3 1 2 3 3 2 gt- -25 ~ 3 Ii 7 7 1 7 8 9 B B 8 B A lt1 8 8 9 9 8 7 + 1 -

3 6 7 7 7 7 9 A B B 8 A 7 6 7 A A 9 7 5 3 1 f 6 6 6 8 9 A A A 9 6 If If 7 9 9 8 6 3

3 It 6 8 9 9 9 9 8 7 5 3 + 7 8 8 6 2 3 6 8 8 8 6 5 3 3 2 + 6 6 It

-50 ~ 1 It 6 7 T It 2 2 2 2 2 3 + 1 -2 + 5 2 I 1 I I 3 3 2

I I 2 3 1 2 1 I 3 3 2 1

-75 Ishy

2 2 I I -I

I I I I I I

-100 -75 -50 -25 o 25 50 75 100 bull

x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

I I lr- I I I I

l-4-204771_ 45 I- r- shy

r shy

~ ~ - CENTER POINT 020 nmi ~r-40 - shy-

shy-r-shy

rshy35 - r- shy

r- _rshy -~ ~ 30 ~ - - shyoCt

Ir shy ~ 0 U 0 oCt

rshy25 r- shy

0 ~

0 r- shyr-W

m 20 shyE - - shygt z

- r-- shy15 r- shy-

I shy

10 - - shyI shy

-rshy-r shy

05 - - shy

- ~

rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

3 pound+ It 6 8 8 8 1 e 5 3 1 5 1 1 8 8 6 pound+

2 3 pound+ 5 7 8 8 8 1 6 5 5 5 6 6 6 6 8 I 8 6 2 50 ~ 2 3 5 8 lt) lt) lt) 8 6 2 3 5 7 7 6 6 7 8 lt) lt) 8 5 3 -

2 3 5 8 lt) A lt) 7 6 pound+ 1 8 8 1 5 7 8 8 lt) lt) 1 6 3 ~ 3 5 6 7 7 lt) lt) A A 7 5 3 1 6 8 lt) 7 5 3 5 8 lt) lt) lt) 7 3

1 pound+ 6 1 8 S lt) A lt) A 7 5 pound+ 1 3 lt) lt) 8 3 3 3 5 8 9 9 9 6 5 2 3 6 8 9 lt) lt) lt) lt) 8 lt) 8 lt) 8 6 1 A A lt) 6 7 1 8 9 lt) lt) 7 5 pound+ 2 1

0 0

25 ~ pound+

pound+

6 5

8 7

8 8

9 8

lt)

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lt)

lt)

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8 lt) A A A 8 A A B 8 A 8

6 5

If

1 2 3

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5

5 5 I

6 5 I

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5 2 3

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2 5 6 6 1 2 5 6 7 8 8 8 1 6 5 6 8 8 1 1 5 It 3 1 1 5 6 6 6 6 6 6 6 5 If 1 1 8 6 5 3 1

3 6 1 1 6 5 2 2 pound+ If If 5 1 1 6 It 2 1 1 5 7 1 6 6 3 2 If 5 6 6 It

-50 - 1 pound+ 6 1 5 3 1 1 3 If If If 3 -3 If 5 1 2 2 2 If If 3

1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

~ u lt 0 U 0 lt

u 0 0 W (II

~ ~ Z

30

25

20

15

-

-

-

-

-rshy

10 -

05 -

o 10 20 30 40 50 60 70 80

rh 90 100

RANGE (nmi)

FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

s shy~

00 2

E c-gt -25

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f r

-

2 2 3 5 5 2

6 5 6 1 3 6 6 1 1 1 5 1 8 If 2 1 1 1 8 9 8 6 6 8 8 If 2 2

1 3 9 9 A 1 7 1 1 1 - 3 3 2 If 5 6 8 8 8 9 8 6 2 If If 3 2

q t II) 6 8 8 9 f T 5 t Cgt 3 1 ~ 1 If 5 T 9 A e a 8 8 6 It 3 5 5 5 5 1 9 8 C C 8 9 8 6

1 3 ~ 5 6 f 6 A C 0 E E A 8 5 1

1 5 7 1 8 ( 9 8 o E F F C 8 2 2 1 ~

ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

1 If 5 8 8 816 8 7 5 3 3 5 6 1 716 1 1 6 3

1 3 1 1 8 IJ 8 1 5 If 1 1 5 8 8 8 6 5 2 1

3 0 7 16 If 3 i If b If

1 1

-

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-75 - -

-100 I I

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-50

I

-25 o I

25

I

50

I

75 100

bull x (nmi East Mag)

bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

- r- I r r I I I 1 I

l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

35 ~ -

r-

t 30 laquo 0 U g laquo 25 u 0

0 W CD 20 ~ gt z

15

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~

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10 - -shy

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05

- shy - -

~

~l I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

--

CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

a w OJ ~ gt z

-

-

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25

20

15

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-shyrshy

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~

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-I

-

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~ ~10

~

- ~

-

~ -05 -

o 10 20 30

RANGE

40 50

Il (nmil

60

I

70 I

80

I

90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

1 It 5 6 6 7 7 9 A 0 0 2 It 5 6 7 7 7 7 9 A A

2 It 5 II 6 6 5 It 7 8 7 2 It 5 It 3 3 If 3 If If 3 I 2 3 2 2 3 2 1 I I 2 3 2 1 I

1 1

2 3 ~

It 5 6 5 6 6 6 t 5 6 5 5 It 3 7 J

If

7 3 8 3 - A

It 5 5 5 3 I

2 3 ~

2

-

-

-

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-75 Ishy -

bull bull

-100 I

-75 I I I

-50 -25 0 25

X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

0 15 ~ - shyw CD E shygt z

-~

~ -r shy10 shy-- - r-

~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

40 NUMBER OF AIRCRAFT IN EACH SCAN

30

r-

hVERAGED OVER 40 sec

AVERAGED OVER 120 sec

~

rshylL ltt a u a ltt lL o a w CD ~ J Z

20

10

CENTER POINT RANGE 10 nmi

(-10 -10)

o 50 100 150 200 250 300

SCAN NUMBER

Fig~3 Time variation traffic in the LA area - peak location shy

6

150

I-La 125 lt a U a lt La 0 100

a ILl m ~ ~ Z 75

50 CENTER POINT TMF RANGE 80 nmi

25

l -4-204521_

a 50 100 150 200 250 300

SCAN NUMBER

Fig4 Time variation of traffic in the LA Basin - Total

7

ATC-SO (5)Lt o

TAPE TMF 8128 20 MIN 8AMitlE ~ Lt 100 ---------~-~~-----7__II~____ W-C_ 25middotNMIa-C RANGE-CO() LIMIT g~ Z-CO WI() degOm 50~---------6--+---------4~-G----+---ta--cWI vl~ wzzgt-raquo i=()Oc(ZOJc( 0i ~ 0-----j50a----1-0-0a----1-5-0-------20-0~

raquodeg INSTANTANEOUS NO OF AIRCRAFT

Fig5 Short term variability - Cumulative distribution of aircraft count

ATC-SO (6)

TAPE TMF 8128 20 MIN SAMPLE

o 20 z o ~ ltgt w c 10 c a lt c z LA BASIN lt MEASUREMENTS en

50 100 150 200

AVERAGE NO OF AIRCRAFT n

Fig6 Short term variability - Comparison between mean and standard deviation

8

flgtAIRCRAFT40 9 001 AIRCRAFT

09~ ~ 0 PER nmi2 003 2

0 9 ~~~ PEAK 007 PER nml 20

~ -= o z -20

E c

-40

-60 TMF 8046 TMF 8055 THURS 1630 PST 111176 MON 1230 PST 111576

40

20a 0 ~

0 s

0 ~ -z -20 E c ~ -40

-60 TMF 8122 TMF 8126 SAT 1400 PST 112076 SUN 130 PST 112176

-60 -40 -20 o 20 40 60 -60 -40 -20 o 20 40 60

X lnmi East Mag) X lnmi East Mag)

Fig7 Day-to-day comparison of LA Basin traffic

9

30 TRAFFIC IN OTHER LOCATIONS

Figures 8 9 and 10 present traffic density maps of respectively Washington DC Philadelphia and Boston As in Fig 1 the sYmbols plotted indicate the local density averaged over the region within 10 nmi of each point The Boston data was recorded with the TMF located at Deer Island a favorable site about 2 nmi east of Logan Airport This site was found to give excellent coverage of the airspace around Boston The Philadelphia data was recorded when the TMF was located near Clementon NJ a site about 15 nmi southeast of Philadelphia International Airport also providing excellent coverage

The Washington data in Fig 8 was recorded with the TMF located at Washington National Airport In this case it was found that an excessive number of targets were recorded at close range -- thought to be primarily false targets due to reflections and imperfect sidelobe suppression Because of this condition all targets with ranges less than 2 nmi were deleted prior to the computation of traffic densities This range filtering was done only in the case of the Washington data

Cumulative range distributions N(R) of aircraft plotted in Fig 11 permit comparisons to be made among sites and among different days at each site Each curve gives the range distribution relative to the location of maximum density The curve marked high density traffic model LAl is discussed in the next section

The day-to-day similarities in LA traffic discussed above in connection with Fig 7 are also apparent here with TMF8l26 having the maximum density It is also seen that TMF8l26 exhibits the maximum density among all of the tapes reduced regardless of location The results exhibit a moderate day-to-day repeatability in each location Although the curve shapes in Fig 11 are all similar certain differences may be noted For example N(lO nmi) results at Boston Philadelphia and Washington are all approximately equal and yet N(60 nmi) results exhibit appreciable differences with Philadelphia exceeding Washington and Washington exceeding Boston In other words the traffic density in Boston falls off rapidly away from the location of peak density while Washington and Philadelphia traffic densities falloff less rapidly In all three cases the distribution beyond 10 nmi is moderately well approximately by a uniform-in-range model with 1 to 2 aircraft per nmi (which is considerably less than the 3 aircraft per nmi of LA)

Density map comparisons showing day-to-day repeatability to Washington Philadelphia and Boston are given in Figs 12 13 and 14 Day-to-day changes in spatial distribution are more evident in the Philadelphia plots as compared with the other locations These changes may be the result of the

10

ATe-80 (8)

MEASUREMENT TMF 4039 MON 24 MAY 1976 1114-1134 EDT

- E

J a 0 z

40

20

0

1

1

1

I

s t

J 1 ( J r 1 ~

- -- L 1 Sshy f 4 6 pound J ( f c~~j

I ~ i f

~ ~l l C D I bull A C- 1gt

7 ~

~ 4 45 bull bull ~ ~ 1 1 amp

3 1 I

t 7 s f 1 r 1 f 9

c ~c

bull ~

bull t

8

4shy

3

4shy

J

7

1

z

I

1

~

t

Z 1

~ Z ~

gtshy-20

I t r ( ( ~ sshy f

( ~ S ~

-40 i S

-40 -20 a 20 40 60

X(NMI EAST MAG) KEY -

SYMBOL

123456189ABCDEFGHlJKLMNOPQRST i 11111111 IIIILi iii iii

0001 001 01 1

TRAFFIC DENSITY p (AIRCRAFTINMl2)

Fig8 Traffic density map Washington DC

11

ATe-80 (9)

MEASUREMENT TMF 5026 THURS 24 JUNE 1976 1358-1428 EDTshy

r 7 t bull or r I 7 1 9 q

40

1 z20 3

r r r o

r r r r

Z~

4

3 4

4

-gt -20 ~

r I I

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1tN6E ur _ I P~UNIamp--71IIS ~s_ 1

-60 -4Q -20 o 20 40 60

X(NMI EASTMAGJ

KEY shySYMBOL

1234 56789ABCOE FGH IJ KLMNOPQRST 11111111 IIIILI ~I iii bull ~I

0001 001 01 1

TRAFFIC DENSITYp CAIRCRAFTNMI2)

Fig9 Traffic density map Philadelphia

12

ATe-so (10)

MEASUREMENT TMF 3037 MON 29 MARCH1976 1541-1559 EST

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KEY -SYMBOL

12345678 9ABCDE FGH I J K LMNOPQRS T I I I I I I I I I I I I I l-I i i i V

0001 001 01 1

TRAFFIC DENSITYp (AlRCRAFTNMl2 )

FigIO Traffic density map Boston

13

1000

l18-4-19158 L LA HIGH DENSITY

TRAFFIC MODEL LA

0

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Fig11 Traffic distributions

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50 100

in range

14

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Fig12

40

20

0

-40 TMF 4001 THURS MAY 6 1976

40

20

-20

-40

40

20

TMF 4045 FRI MAY 28 1976

-60 -40 -20

-40

-20

C42-1705

1600 EDT

40

1300 EDT

0 20 40 60

x (nmi EAST OF TMF MAG)

Day-to-day comparison of Washington traffic

15

C42-1706

40

20

O~---+---++W---------i

-20 )

TMF 5005 -40 TUES JUNE 15 1976 1000 EDT

C)

lt 4i

u i 0 ~

I a 0 z E c

~

40

20

O~---f--l~_~----------l

-20

-40

x (nml EAST OF TMF MAG)

Fig 13 Day-to-day comparison of Philadelphia traffic

16

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

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E shyc CJ shy --r ~

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~ ~ I shy

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o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

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FigA-l LA map TMF8126

A-3

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10 I I I I I T I I1 l-4-20461 L

9 shy-1-

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FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

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7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

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- ~I o 10 20 30 40 50 60 70 80 90 100

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FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

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~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

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z -

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FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

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t -75

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25

gt- -25

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FigA-7 LA map TMF8055

A-9

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8 I I r- r J I I I

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FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

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A 9 2 1 5 2 1 2

1 2 2 2 1 3 3 3 2 1 -

5 6 6 5 5 6 7 1 1 6 222 2 3 3 3 2 1 3 5 6 6 6 5 5 5 5 5 If 3 1 122 3 3 2 1 3 5 6 6 5 5 3 If If 2 1 1 2 1 1 2 5 2 1 If 3 3 2 1 122 1

-50 - 1 233 3 2 1 222 1 -223 If 2 1 1 12 3 1 t

2 3 3 1 1 2 1

-75 ~ -

I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

35 ~ shy

I-r-

rshy -~ IJ 30 ~ shylaquo -a r-u shy -a laquo ~- shyIJ 25 l- I- I- shy0 -a - lshyw CD 20 I- shygt ~

-rshyz ~

- -15 - -~ ~ shyrshy

1-shy

r- 0 shy

rshy

-- -05 shy- Ishy

-

mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

~ 1 If 5 6 6 6 9 A B 0 0 0 lt- C B 9 7 5 If

2 3 5 6 6 7 8 A C 0 0 E 0 C B B A 9 7 5 1s ~

2 If If 5 6 7 9 A C 0 E o C 8 A A A 962 ~ o _0 3 5 6 -+-6--amp--e-9--fr~- ~--i---9--8-8 ~ ~ ~ ~ ~

Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

-50 - 332 -shy2 1

-75 1 - shy

1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

~25 shy

Ishy

Ishy~~ 20 shy

0 U Ishy0

r shyltt Ishy

lL ~o I-shylshy

~ Ishyffi 5 shyf-CD

~ gt z

- 0 shy-

05 shy

Ishy

~

h I I I o

10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

~

1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

1 3

1 1 2 2 2

1 3 3 3 3 1 3 2 If If 3 3 2 6 6 6 5 If 3 2

8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

-

--

-

-75 ~

--

-

1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

~

-shyz

10 ~ shy-

05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

0 --

3 5

- shy6 5 5

6

7

7

-9

A

A

n

A 8

n

8

9

8

n

C A

9

-9 9

-

9

-

8

-

1 2

3 3

v

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3

ft

shy

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6 3

6 6

7 6

8 8

9

8 8 8

8

9 7 8

7 8

9

9 A A

C 8 C 0

8 0

A

8 9 9

8 7

6 3

2 2

2

2

2

2

2 2 2 3 1

1 1 If 5 7 9 8 C 8 8 9 9 C C 8 A 7 3 1 1 gtshy -25 ~ 1 1 2 7 A C C C 8 A A 9 8 8 9 6 -

2 3 3 3 If 6 A C C C A A 9 9 9 9 5 2 3 If 5 5 6 9 8 8 A 8 8 8 9 7 If

2 If 6 6 6 6 7 8 8 7 5 5 7 7 5 3 2 If 6 6 6 5 If 6 6 5 6 6 7 6 If

-50 ~ If 5 6 5 2 3 5 6 8 7 7 3 -2 If If 2 5 7 8 7 6

1 3 6 T 7 6 If

1 3 If 6 6 6 If

2 If 5 5 If 2

-75 - 2 3 2 1 -

I I ~J I 1 I i I I A shy

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

-- -

Ishy

-4 shy- shy

IJ shylaquo 0 I- shyu ~ 0

laquo IJ

3 - shy~ 0 f- shy-0 - l- I-- IshyIJJ shyCD - E I-lshygt shyz

2 - shy~ -f-

-fshy -

~ shy

I- shy

-

J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

Lshy ~

o Z

0

3 2 ~ 1

5 f ~ 2

5 5

l

6 5

1

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1

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1 8 6 8- ~ J V

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9

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U

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C 0 D DOE A ~ ~

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8 8 C

C C 8 9 A 9 8 T 5 5 5 f It 3 1 eBB B B A 9 7 5 5 5 5 5 5 3 A A A A bull - shy - - shy - ~ u U _JJJoJamp

C 8 A A A A 8 5 5 5 5 5 5 + 3

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1 2

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f

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9

8 9 7

8 6 5 7 5 If

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+ 5 5 5 +

3

3 It 6 6 6 6 7 8 A amp 8 8 A A A 9 9 9 8 i 6 3 1 2 3 3 2 gt- -25 ~ 3 Ii 7 7 1 7 8 9 B B 8 B A lt1 8 8 9 9 8 7 + 1 -

3 6 7 7 7 7 9 A B B 8 A 7 6 7 A A 9 7 5 3 1 f 6 6 6 8 9 A A A 9 6 If If 7 9 9 8 6 3

3 It 6 8 9 9 9 9 8 7 5 3 + 7 8 8 6 2 3 6 8 8 8 6 5 3 3 2 + 6 6 It

-50 ~ 1 It 6 7 T It 2 2 2 2 2 3 + 1 -2 + 5 2 I 1 I I 3 3 2

I I 2 3 1 2 1 I 3 3 2 1

-75 Ishy

2 2 I I -I

I I I I I I

-100 -75 -50 -25 o 25 50 75 100 bull

x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

I I lr- I I I I

l-4-204771_ 45 I- r- shy

r shy

~ ~ - CENTER POINT 020 nmi ~r-40 - shy-

shy-r-shy

rshy35 - r- shy

r- _rshy -~ ~ 30 ~ - - shyoCt

Ir shy ~ 0 U 0 oCt

rshy25 r- shy

0 ~

0 r- shyr-W

m 20 shyE - - shygt z

- r-- shy15 r- shy-

I shy

10 - - shyI shy

-rshy-r shy

05 - - shy

- ~

rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

3 pound+ It 6 8 8 8 1 e 5 3 1 5 1 1 8 8 6 pound+

2 3 pound+ 5 7 8 8 8 1 6 5 5 5 6 6 6 6 8 I 8 6 2 50 ~ 2 3 5 8 lt) lt) lt) 8 6 2 3 5 7 7 6 6 7 8 lt) lt) 8 5 3 -

2 3 5 8 lt) A lt) 7 6 pound+ 1 8 8 1 5 7 8 8 lt) lt) 1 6 3 ~ 3 5 6 7 7 lt) lt) A A 7 5 3 1 6 8 lt) 7 5 3 5 8 lt) lt) lt) 7 3

1 pound+ 6 1 8 S lt) A lt) A 7 5 pound+ 1 3 lt) lt) 8 3 3 3 5 8 9 9 9 6 5 2 3 6 8 9 lt) lt) lt) lt) 8 lt) 8 lt) 8 6 1 A A lt) 6 7 1 8 9 lt) lt) 7 5 pound+ 2 1

0 0

25 ~ pound+

pound+

6 5

8 7

8 8

9 8

lt)

8 8 8

lt)

lt)

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A A lt) 8 8 A A lt)

8 lt) A A A 8 A A B 8 A 8

6 5

If

1 2 3

2 2

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0 0

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Of

5

5 5 I

6 5 I

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lt) lt) lt) lt) lt) 8 0 E 8 A A A A C 0 E e A B 8 ft- shy - shy

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z 2 3 3 5 6 7 8 8 8 8 8 B B 0 0 C lt) 7 6 1 1 6 6 If 3 3 3 3 2

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1

6 6 1 6

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lt)

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8 8 8

6 1 8

6 6 6

6 5 3

5 2 3

3 2

1

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gtshy shy-25 6 1 1 6 3 6 1 8 8 lt) lt) 8 6 6 8 lt) lt) 8 5 5 2 -

2 5 6 6 1 2 5 6 7 8 8 8 1 6 5 6 8 8 1 1 5 It 3 1 1 5 6 6 6 6 6 6 6 5 If 1 1 8 6 5 3 1

3 6 1 1 6 5 2 2 pound+ If If 5 1 1 6 It 2 1 1 5 7 1 6 6 3 2 If 5 6 6 It

-50 - 1 pound+ 6 1 5 3 1 1 3 If If If 3 -3 If 5 1 2 2 2 If If 3

1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

~ u lt 0 U 0 lt

u 0 0 W (II

~ ~ Z

30

25

20

15

-

-

-

-

-rshy

10 -

05 -

o 10 20 30 40 50 60 70 80

rh 90 100

RANGE (nmi)

FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

s shy~

00 2

E c-gt -25

-50

f r

-

2 2 3 5 5 2

6 5 6 1 3 6 6 1 1 1 5 1 8 If 2 1 1 1 8 9 8 6 6 8 8 If 2 2

1 3 9 9 A 1 7 1 1 1 - 3 3 2 If 5 6 8 8 8 9 8 6 2 If If 3 2

q t II) 6 8 8 9 f T 5 t Cgt 3 1 ~ 1 If 5 T 9 A e a 8 8 6 It 3 5 5 5 5 1 9 8 C C 8 9 8 6

1 3 ~ 5 6 f 6 A C 0 E E A 8 5 1

1 5 7 1 8 ( 9 8 o E F F C 8 2 2 1 ~

ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

1 If 5 8 8 816 8 7 5 3 3 5 6 1 716 1 1 6 3

1 3 1 1 8 IJ 8 1 5 If 1 1 5 8 8 8 6 5 2 1

3 0 7 16 If 3 i If b If

1 1

-

-

-

-

-

-75 - -

-100 I I

-75 I I

-50

I

-25 o I

25

I

50

I

75 100

bull x (nmi East Mag)

bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

- r- I r r I I I 1 I

l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

35 ~ -

r-

t 30 laquo 0 U g laquo 25 u 0

0 W CD 20 ~ gt z

15

~ ~ -

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~

~ --

10 - -shy

~ -

05

- shy - -

~

~l I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

--

CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

a w OJ ~ gt z

-

-

~

25

20

15

- -

-- -shy -

-shyrshy

~

~

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-I

-

-

shy

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~

- ~

-

~ -05 -

o 10 20 30

RANGE

40 50

Il (nmil

60

I

70 I

80

I

90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

1 It 5 6 6 7 7 9 A 0 0 2 It 5 6 7 7 7 7 9 A A

2 It 5 II 6 6 5 It 7 8 7 2 It 5 It 3 3 If 3 If If 3 I 2 3 2 2 3 2 1 I I 2 3 2 1 I

1 1

2 3 ~

It 5 6 5 6 6 6 t 5 6 5 5 It 3 7 J

If

7 3 8 3 - A

It 5 5 5 3 I

2 3 ~

2

-

-

-

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-75 Ishy -

bull bull

-100 I

-75 I I I

-50 -25 0 25

X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

0 15 ~ - shyw CD E shygt z

-~

~ -r shy10 shy-- - r-

~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

150

I-La 125 lt a U a lt La 0 100

a ILl m ~ ~ Z 75

50 CENTER POINT TMF RANGE 80 nmi

25

l -4-204521_

a 50 100 150 200 250 300

SCAN NUMBER

Fig4 Time variation of traffic in the LA Basin - Total

7

ATC-SO (5)Lt o

TAPE TMF 8128 20 MIN 8AMitlE ~ Lt 100 ---------~-~~-----7__II~____ W-C_ 25middotNMIa-C RANGE-CO() LIMIT g~ Z-CO WI() degOm 50~---------6--+---------4~-G----+---ta--cWI vl~ wzzgt-raquo i=()Oc(ZOJc( 0i ~ 0-----j50a----1-0-0a----1-5-0-------20-0~

raquodeg INSTANTANEOUS NO OF AIRCRAFT

Fig5 Short term variability - Cumulative distribution of aircraft count

ATC-SO (6)

TAPE TMF 8128 20 MIN SAMPLE

o 20 z o ~ ltgt w c 10 c a lt c z LA BASIN lt MEASUREMENTS en

50 100 150 200

AVERAGE NO OF AIRCRAFT n

Fig6 Short term variability - Comparison between mean and standard deviation

8

flgtAIRCRAFT40 9 001 AIRCRAFT

09~ ~ 0 PER nmi2 003 2

0 9 ~~~ PEAK 007 PER nml 20

~ -= o z -20

E c

-40

-60 TMF 8046 TMF 8055 THURS 1630 PST 111176 MON 1230 PST 111576

40

20a 0 ~

0 s

0 ~ -z -20 E c ~ -40

-60 TMF 8122 TMF 8126 SAT 1400 PST 112076 SUN 130 PST 112176

-60 -40 -20 o 20 40 60 -60 -40 -20 o 20 40 60

X lnmi East Mag) X lnmi East Mag)

Fig7 Day-to-day comparison of LA Basin traffic

9

30 TRAFFIC IN OTHER LOCATIONS

Figures 8 9 and 10 present traffic density maps of respectively Washington DC Philadelphia and Boston As in Fig 1 the sYmbols plotted indicate the local density averaged over the region within 10 nmi of each point The Boston data was recorded with the TMF located at Deer Island a favorable site about 2 nmi east of Logan Airport This site was found to give excellent coverage of the airspace around Boston The Philadelphia data was recorded when the TMF was located near Clementon NJ a site about 15 nmi southeast of Philadelphia International Airport also providing excellent coverage

The Washington data in Fig 8 was recorded with the TMF located at Washington National Airport In this case it was found that an excessive number of targets were recorded at close range -- thought to be primarily false targets due to reflections and imperfect sidelobe suppression Because of this condition all targets with ranges less than 2 nmi were deleted prior to the computation of traffic densities This range filtering was done only in the case of the Washington data

Cumulative range distributions N(R) of aircraft plotted in Fig 11 permit comparisons to be made among sites and among different days at each site Each curve gives the range distribution relative to the location of maximum density The curve marked high density traffic model LAl is discussed in the next section

The day-to-day similarities in LA traffic discussed above in connection with Fig 7 are also apparent here with TMF8l26 having the maximum density It is also seen that TMF8l26 exhibits the maximum density among all of the tapes reduced regardless of location The results exhibit a moderate day-to-day repeatability in each location Although the curve shapes in Fig 11 are all similar certain differences may be noted For example N(lO nmi) results at Boston Philadelphia and Washington are all approximately equal and yet N(60 nmi) results exhibit appreciable differences with Philadelphia exceeding Washington and Washington exceeding Boston In other words the traffic density in Boston falls off rapidly away from the location of peak density while Washington and Philadelphia traffic densities falloff less rapidly In all three cases the distribution beyond 10 nmi is moderately well approximately by a uniform-in-range model with 1 to 2 aircraft per nmi (which is considerably less than the 3 aircraft per nmi of LA)

Density map comparisons showing day-to-day repeatability to Washington Philadelphia and Boston are given in Figs 12 13 and 14 Day-to-day changes in spatial distribution are more evident in the Philadelphia plots as compared with the other locations These changes may be the result of the

10

ATe-80 (8)

MEASUREMENT TMF 4039 MON 24 MAY 1976 1114-1134 EDT

- E

J a 0 z

40

20

0

1

1

1

I

s t

J 1 ( J r 1 ~

- -- L 1 Sshy f 4 6 pound J ( f c~~j

I ~ i f

~ ~l l C D I bull A C- 1gt

7 ~

~ 4 45 bull bull ~ ~ 1 1 amp

3 1 I

t 7 s f 1 r 1 f 9

c ~c

bull ~

bull t

8

4shy

3

4shy

J

7

1

z

I

1

~

t

Z 1

~ Z ~

gtshy-20

I t r ( ( ~ sshy f

( ~ S ~

-40 i S

-40 -20 a 20 40 60

X(NMI EAST MAG) KEY -

SYMBOL

123456189ABCDEFGHlJKLMNOPQRST i 11111111 IIIILi iii iii

0001 001 01 1

TRAFFIC DENSITY p (AIRCRAFTINMl2)

Fig8 Traffic density map Washington DC

11

ATe-80 (9)

MEASUREMENT TMF 5026 THURS 24 JUNE 1976 1358-1428 EDTshy

r 7 t bull or r I 7 1 9 q

40

1 z20 3

r r r o

r r r r

Z~

4

3 4

4

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I

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-60 -4Q -20 o 20 40 60

X(NMI EASTMAGJ

KEY shySYMBOL

1234 56789ABCOE FGH IJ KLMNOPQRST 11111111 IIIILI ~I iii bull ~I

0001 001 01 1

TRAFFIC DENSITYp CAIRCRAFTNMI2)

Fig9 Traffic density map Philadelphia

12

ATe-so (10)

MEASUREMENT TMF 3037 MON 29 MARCH1976 1541-1559 EST

I bull

- ~

lt ~

I t-a 0 Z

i z-gtshy

40

20

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l bull Z 1

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XCNMI EAST MAGJ

KEY -SYMBOL

12345678 9ABCDE FGH I J K LMNOPQRS T I I I I I I I I I I I I I l-I i i i V

0001 001 01 1

TRAFFIC DENSITYp (AlRCRAFTNMl2 )

FigIO Traffic density map Boston

13

1000

l18-4-19158 L LA HIGH DENSITY

TRAFFIC MODEL LA

0

W () Z ~ 0

Z I 100 t shy

~

t shy~

~ 0 U Q

ltt ~

o Q W m ~ 10 Z

w () ~ Q W

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1 _---_--1_6---1-- shy

201052

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Fig11 Traffic distributions

bull J

6-----

50 100

in range

14

(

CI ~ ~

~

=E ~

IL 0 z ~ a ~

E c

gtshy

Ishy

Fig12

40

20

0

-40 TMF 4001 THURS MAY 6 1976

40

20

-20

-40

40

20

TMF 4045 FRI MAY 28 1976

-60 -40 -20

-40

-20

C42-1705

1600 EDT

40

1300 EDT

0 20 40 60

x (nmi EAST OF TMF MAG)

Day-to-day comparison of Washington traffic

15

C42-1706

40

20

O~---+---++W---------i

-20 )

TMF 5005 -40 TUES JUNE 15 1976 1000 EDT

C)

lt 4i

u i 0 ~

I a 0 z E c

~

40

20

O~---f--l~_~----------l

-20

-40

x (nml EAST OF TMF MAG)

Fig 13 Day-to-day comparison of Philadelphia traffic

16

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

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-~ lL ltX f- - shya U a lti I- shy

lL 20 ~ I--

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I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

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I ~

-

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I

taO

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FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

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3 - shy

r-shy~2 - shy

1shy

~r-~

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shy ~ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

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o Z

0

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2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

~7 shy

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I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

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2 + + 3 2 50 2 5 5 At J

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I J J I b b i) b b b 5 J -75 1 3 + 5 I 1

I I 2

~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

-

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6 - -rshylL

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lt -0 U 0 5 - -lt

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z -

shy--

2 fshy -- -

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1-shyI--~-

-

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

Ishy

~-

t -75

-50

25

gt- -25

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V V V V

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1 2 If 5 6 6 7 7 8 8 9 9 A A 8 8 A 9 5 1 1 2 5 5 6 6 6 7 7 7 1 9 A 8 8 B 8 3

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-

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-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-7 LA map TMF8055

A-9

- -

8 I I r- r J I I I

--4-20467 L ~7 shy

I shy

I- CENTERPOINT -5 nmi -15 nmi _6 ~

f shy

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-rshy

~ f-f- shy2 - shy

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~ ~-~ -I shy

- nTh+-_ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

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1 9 A A b B B 8 8 3 1 8 J 9 A A 9 9 A

0 C B 7 6 33 3 2 1 B A 8 6 3 2 3 3 2

gt- -25 - 3 5 6 7 8 9 8 9 9 1 2 5 5 6 1 1 8 8 8

A 9 2 1 5 2 1 2

1 2 2 2 1 3 3 3 2 1 -

5 6 6 5 5 6 7 1 1 6 222 2 3 3 3 2 1 3 5 6 6 6 5 5 5 5 5 If 3 1 122 3 3 2 1 3 5 6 6 5 5 3 If If 2 1 1 2 1 1 2 5 2 1 If 3 3 2 1 122 1

-50 - 1 233 3 2 1 222 1 -223 If 2 1 1 12 3 1 t

2 3 3 1 1 2 1

-75 ~ -

I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

35 ~ shy

I-r-

rshy -~ IJ 30 ~ shylaquo -a r-u shy -a laquo ~- shyIJ 25 l- I- I- shy0 -a - lshyw CD 20 I- shygt ~

-rshyz ~

- -15 - -~ ~ shyrshy

1-shy

r- 0 shy

rshy

-- -05 shy- Ishy

-

mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

~ 1 If 5 6 6 6 9 A B 0 0 0 lt- C B 9 7 5 If

2 3 5 6 6 7 8 A C 0 0 E 0 C B B A 9 7 5 1s ~

2 If If 5 6 7 9 A C 0 E o C 8 A A A 962 ~ o _0 3 5 6 -+-6--amp--e-9--fr~- ~--i---9--8-8 ~ ~ ~ ~ ~

Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

-50 - 332 -shy2 1

-75 1 - shy

1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

~25 shy

Ishy

Ishy~~ 20 shy

0 U Ishy0

r shyltt Ishy

lL ~o I-shylshy

~ Ishyffi 5 shyf-CD

~ gt z

- 0 shy-

05 shy

Ishy

~

h I I I o

10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

~

1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

1 3

1 1 2 2 2

1 3 3 3 3 1 3 2 If If 3 3 2 6 6 6 5 If 3 2

8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

-

--

-

-75 ~

--

-

1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

~

-shyz

10 ~ shy-

05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

0 --

3 5

- shy6 5 5

6

7

7

-9

A

A

n

A 8

n

8

9

8

n

C A

9

-9 9

-

9

-

8

-

1 2

3 3

v

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3

ft

shy

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6 3

6 6

7 6

8 8

9

8 8 8

8

9 7 8

7 8

9

9 A A

C 8 C 0

8 0

A

8 9 9

8 7

6 3

2 2

2

2

2

2

2 2 2 3 1

1 1 If 5 7 9 8 C 8 8 9 9 C C 8 A 7 3 1 1 gtshy -25 ~ 1 1 2 7 A C C C 8 A A 9 8 8 9 6 -

2 3 3 3 If 6 A C C C A A 9 9 9 9 5 2 3 If 5 5 6 9 8 8 A 8 8 8 9 7 If

2 If 6 6 6 6 7 8 8 7 5 5 7 7 5 3 2 If 6 6 6 5 If 6 6 5 6 6 7 6 If

-50 ~ If 5 6 5 2 3 5 6 8 7 7 3 -2 If If 2 5 7 8 7 6

1 3 6 T 7 6 If

1 3 If 6 6 6 If

2 If 5 5 If 2

-75 - 2 3 2 1 -

I I ~J I 1 I i I I A shy

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

-- -

Ishy

-4 shy- shy

IJ shylaquo 0 I- shyu ~ 0

laquo IJ

3 - shy~ 0 f- shy-0 - l- I-- IshyIJJ shyCD - E I-lshygt shyz

2 - shy~ -f-

-fshy -

~ shy

I- shy

-

J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

Lshy ~

o Z

0

3 2 ~ 1

5 f ~ 2

5 5

l

6 5

1

6 6

1

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1 8 6 8- ~ J V

6 8

9 9 ~

9

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A

U

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C 0 D DOE A ~ ~

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8 8 C

C C 8 9 A 9 8 T 5 5 5 f It 3 1 eBB B B A 9 7 5 5 5 5 5 5 3 A A A A bull - shy - - shy - ~ u U _JJJoJamp

C 8 A A A A 8 5 5 5 5 5 5 + 3

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1 2

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f

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9

8 9 7

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+ 5 5 5 +

3

3 It 6 6 6 6 7 8 A amp 8 8 A A A 9 9 9 8 i 6 3 1 2 3 3 2 gt- -25 ~ 3 Ii 7 7 1 7 8 9 B B 8 B A lt1 8 8 9 9 8 7 + 1 -

3 6 7 7 7 7 9 A B B 8 A 7 6 7 A A 9 7 5 3 1 f 6 6 6 8 9 A A A 9 6 If If 7 9 9 8 6 3

3 It 6 8 9 9 9 9 8 7 5 3 + 7 8 8 6 2 3 6 8 8 8 6 5 3 3 2 + 6 6 It

-50 ~ 1 It 6 7 T It 2 2 2 2 2 3 + 1 -2 + 5 2 I 1 I I 3 3 2

I I 2 3 1 2 1 I 3 3 2 1

-75 Ishy

2 2 I I -I

I I I I I I

-100 -75 -50 -25 o 25 50 75 100 bull

x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

I I lr- I I I I

l-4-204771_ 45 I- r- shy

r shy

~ ~ - CENTER POINT 020 nmi ~r-40 - shy-

shy-r-shy

rshy35 - r- shy

r- _rshy -~ ~ 30 ~ - - shyoCt

Ir shy ~ 0 U 0 oCt

rshy25 r- shy

0 ~

0 r- shyr-W

m 20 shyE - - shygt z

- r-- shy15 r- shy-

I shy

10 - - shyI shy

-rshy-r shy

05 - - shy

- ~

rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

3 pound+ It 6 8 8 8 1 e 5 3 1 5 1 1 8 8 6 pound+

2 3 pound+ 5 7 8 8 8 1 6 5 5 5 6 6 6 6 8 I 8 6 2 50 ~ 2 3 5 8 lt) lt) lt) 8 6 2 3 5 7 7 6 6 7 8 lt) lt) 8 5 3 -

2 3 5 8 lt) A lt) 7 6 pound+ 1 8 8 1 5 7 8 8 lt) lt) 1 6 3 ~ 3 5 6 7 7 lt) lt) A A 7 5 3 1 6 8 lt) 7 5 3 5 8 lt) lt) lt) 7 3

1 pound+ 6 1 8 S lt) A lt) A 7 5 pound+ 1 3 lt) lt) 8 3 3 3 5 8 9 9 9 6 5 2 3 6 8 9 lt) lt) lt) lt) 8 lt) 8 lt) 8 6 1 A A lt) 6 7 1 8 9 lt) lt) 7 5 pound+ 2 1

0 0

25 ~ pound+

pound+

6 5

8 7

8 8

9 8

lt)

8 8 8

lt)

lt)

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A A lt) 8 8 A A lt)

8 lt) A A A 8 A A B 8 A 8

6 5

If

1 2 3

2 2

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0 0

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Of

5

5 5 I

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lt) lt) lt) lt) lt) 8 0 E 8 A A A A C 0 E e A B 8 ft- shy - shy

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z 2 3 3 5 6 7 8 8 8 8 8 B B 0 0 C lt) 7 6 1 1 6 6 If 3 3 3 3 2

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6 6 5

8 7

6

lt)

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8 8 8

6 1 8

6 6 6

6 5 3

5 2 3

3 2

1

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1

gtshy shy-25 6 1 1 6 3 6 1 8 8 lt) lt) 8 6 6 8 lt) lt) 8 5 5 2 -

2 5 6 6 1 2 5 6 7 8 8 8 1 6 5 6 8 8 1 1 5 It 3 1 1 5 6 6 6 6 6 6 6 5 If 1 1 8 6 5 3 1

3 6 1 1 6 5 2 2 pound+ If If 5 1 1 6 It 2 1 1 5 7 1 6 6 3 2 If 5 6 6 It

-50 - 1 pound+ 6 1 5 3 1 1 3 If If If 3 -3 If 5 1 2 2 2 If If 3

1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

~ u lt 0 U 0 lt

u 0 0 W (II

~ ~ Z

30

25

20

15

-

-

-

-

-rshy

10 -

05 -

o 10 20 30 40 50 60 70 80

rh 90 100

RANGE (nmi)

FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

s shy~

00 2

E c-gt -25

-50

f r

-

2 2 3 5 5 2

6 5 6 1 3 6 6 1 1 1 5 1 8 If 2 1 1 1 8 9 8 6 6 8 8 If 2 2

1 3 9 9 A 1 7 1 1 1 - 3 3 2 If 5 6 8 8 8 9 8 6 2 If If 3 2

q t II) 6 8 8 9 f T 5 t Cgt 3 1 ~ 1 If 5 T 9 A e a 8 8 6 It 3 5 5 5 5 1 9 8 C C 8 9 8 6

1 3 ~ 5 6 f 6 A C 0 E E A 8 5 1

1 5 7 1 8 ( 9 8 o E F F C 8 2 2 1 ~

ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

1 If 5 8 8 816 8 7 5 3 3 5 6 1 716 1 1 6 3

1 3 1 1 8 IJ 8 1 5 If 1 1 5 8 8 8 6 5 2 1

3 0 7 16 If 3 i If b If

1 1

-

-

-

-

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-75 - -

-100 I I

-75 I I

-50

I

-25 o I

25

I

50

I

75 100

bull x (nmi East Mag)

bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

- r- I r r I I I 1 I

l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

35 ~ -

r-

t 30 laquo 0 U g laquo 25 u 0

0 W CD 20 ~ gt z

15

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~

~ --

10 - -shy

~ -

05

- shy - -

~

~l I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

--

CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

a w OJ ~ gt z

-

-

~

25

20

15

- -

-- -shy -

-shyrshy

~

~

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-I

-

-

shy

~ ~10

~

- ~

-

~ -05 -

o 10 20 30

RANGE

40 50

Il (nmil

60

I

70 I

80

I

90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

1 It 5 6 6 7 7 9 A 0 0 2 It 5 6 7 7 7 7 9 A A

2 It 5 II 6 6 5 It 7 8 7 2 It 5 It 3 3 If 3 If If 3 I 2 3 2 2 3 2 1 I I 2 3 2 1 I

1 1

2 3 ~

It 5 6 5 6 6 6 t 5 6 5 5 It 3 7 J

If

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It 5 5 5 3 I

2 3 ~

2

-

-

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-50 Ishy -

-75 Ishy -

bull bull

-100 I

-75 I I I

-50 -25 0 25

X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

0 15 ~ - shyw CD E shygt z

-~

~ -r shy10 shy-- - r-

~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

ATC-SO (5)Lt o

TAPE TMF 8128 20 MIN 8AMitlE ~ Lt 100 ---------~-~~-----7__II~____ W-C_ 25middotNMIa-C RANGE-CO() LIMIT g~ Z-CO WI() degOm 50~---------6--+---------4~-G----+---ta--cWI vl~ wzzgt-raquo i=()Oc(ZOJc( 0i ~ 0-----j50a----1-0-0a----1-5-0-------20-0~

raquodeg INSTANTANEOUS NO OF AIRCRAFT

Fig5 Short term variability - Cumulative distribution of aircraft count

ATC-SO (6)

TAPE TMF 8128 20 MIN SAMPLE

o 20 z o ~ ltgt w c 10 c a lt c z LA BASIN lt MEASUREMENTS en

50 100 150 200

AVERAGE NO OF AIRCRAFT n

Fig6 Short term variability - Comparison between mean and standard deviation

8

flgtAIRCRAFT40 9 001 AIRCRAFT

09~ ~ 0 PER nmi2 003 2

0 9 ~~~ PEAK 007 PER nml 20

~ -= o z -20

E c

-40

-60 TMF 8046 TMF 8055 THURS 1630 PST 111176 MON 1230 PST 111576

40

20a 0 ~

0 s

0 ~ -z -20 E c ~ -40

-60 TMF 8122 TMF 8126 SAT 1400 PST 112076 SUN 130 PST 112176

-60 -40 -20 o 20 40 60 -60 -40 -20 o 20 40 60

X lnmi East Mag) X lnmi East Mag)

Fig7 Day-to-day comparison of LA Basin traffic

9

30 TRAFFIC IN OTHER LOCATIONS

Figures 8 9 and 10 present traffic density maps of respectively Washington DC Philadelphia and Boston As in Fig 1 the sYmbols plotted indicate the local density averaged over the region within 10 nmi of each point The Boston data was recorded with the TMF located at Deer Island a favorable site about 2 nmi east of Logan Airport This site was found to give excellent coverage of the airspace around Boston The Philadelphia data was recorded when the TMF was located near Clementon NJ a site about 15 nmi southeast of Philadelphia International Airport also providing excellent coverage

The Washington data in Fig 8 was recorded with the TMF located at Washington National Airport In this case it was found that an excessive number of targets were recorded at close range -- thought to be primarily false targets due to reflections and imperfect sidelobe suppression Because of this condition all targets with ranges less than 2 nmi were deleted prior to the computation of traffic densities This range filtering was done only in the case of the Washington data

Cumulative range distributions N(R) of aircraft plotted in Fig 11 permit comparisons to be made among sites and among different days at each site Each curve gives the range distribution relative to the location of maximum density The curve marked high density traffic model LAl is discussed in the next section

The day-to-day similarities in LA traffic discussed above in connection with Fig 7 are also apparent here with TMF8l26 having the maximum density It is also seen that TMF8l26 exhibits the maximum density among all of the tapes reduced regardless of location The results exhibit a moderate day-to-day repeatability in each location Although the curve shapes in Fig 11 are all similar certain differences may be noted For example N(lO nmi) results at Boston Philadelphia and Washington are all approximately equal and yet N(60 nmi) results exhibit appreciable differences with Philadelphia exceeding Washington and Washington exceeding Boston In other words the traffic density in Boston falls off rapidly away from the location of peak density while Washington and Philadelphia traffic densities falloff less rapidly In all three cases the distribution beyond 10 nmi is moderately well approximately by a uniform-in-range model with 1 to 2 aircraft per nmi (which is considerably less than the 3 aircraft per nmi of LA)

Density map comparisons showing day-to-day repeatability to Washington Philadelphia and Boston are given in Figs 12 13 and 14 Day-to-day changes in spatial distribution are more evident in the Philadelphia plots as compared with the other locations These changes may be the result of the

10

ATe-80 (8)

MEASUREMENT TMF 4039 MON 24 MAY 1976 1114-1134 EDT

- E

J a 0 z

40

20

0

1

1

1

I

s t

J 1 ( J r 1 ~

- -- L 1 Sshy f 4 6 pound J ( f c~~j

I ~ i f

~ ~l l C D I bull A C- 1gt

7 ~

~ 4 45 bull bull ~ ~ 1 1 amp

3 1 I

t 7 s f 1 r 1 f 9

c ~c

bull ~

bull t

8

4shy

3

4shy

J

7

1

z

I

1

~

t

Z 1

~ Z ~

gtshy-20

I t r ( ( ~ sshy f

( ~ S ~

-40 i S

-40 -20 a 20 40 60

X(NMI EAST MAG) KEY -

SYMBOL

123456189ABCDEFGHlJKLMNOPQRST i 11111111 IIIILi iii iii

0001 001 01 1

TRAFFIC DENSITY p (AIRCRAFTINMl2)

Fig8 Traffic density map Washington DC

11

ATe-80 (9)

MEASUREMENT TMF 5026 THURS 24 JUNE 1976 1358-1428 EDTshy

r 7 t bull or r I 7 1 9 q

40

1 z20 3

r r r o

r r r r

Z~

4

3 4

4

-gt -20 ~

r I I

I

7 J 11 I I shy __ - I I

1tN6E ur _ I P~UNIamp--71IIS ~s_ 1

-60 -4Q -20 o 20 40 60

X(NMI EASTMAGJ

KEY shySYMBOL

1234 56789ABCOE FGH IJ KLMNOPQRST 11111111 IIIILI ~I iii bull ~I

0001 001 01 1

TRAFFIC DENSITYp CAIRCRAFTNMI2)

Fig9 Traffic density map Philadelphia

12

ATe-so (10)

MEASUREMENT TMF 3037 MON 29 MARCH1976 1541-1559 EST

I bull

- ~

lt ~

I t-a 0 Z

i z-gtshy

40

20

O

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l bull Z 1

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XCNMI EAST MAGJ

KEY -SYMBOL

12345678 9ABCDE FGH I J K LMNOPQRS T I I I I I I I I I I I I I l-I i i i V

0001 001 01 1

TRAFFIC DENSITYp (AlRCRAFTNMl2 )

FigIO Traffic density map Boston

13

1000

l18-4-19158 L LA HIGH DENSITY

TRAFFIC MODEL LA

0

W () Z ~ 0

Z I 100 t shy

~

t shy~

~ 0 U Q

ltt ~

o Q W m ~ 10 Z

w () ~ Q W

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1 _---_--1_6---1-- shy

201052

RANGE R (nmi)

Fig11 Traffic distributions

bull J

6-----

50 100

in range

14

(

CI ~ ~

~

=E ~

IL 0 z ~ a ~

E c

gtshy

Ishy

Fig12

40

20

0

-40 TMF 4001 THURS MAY 6 1976

40

20

-20

-40

40

20

TMF 4045 FRI MAY 28 1976

-60 -40 -20

-40

-20

C42-1705

1600 EDT

40

1300 EDT

0 20 40 60

x (nmi EAST OF TMF MAG)

Day-to-day comparison of Washington traffic

15

C42-1706

40

20

O~---+---++W---------i

-20 )

TMF 5005 -40 TUES JUNE 15 1976 1000 EDT

C)

lt 4i

u i 0 ~

I a 0 z E c

~

40

20

O~---f--l~_~----------l

-20

-40

x (nml EAST OF TMF MAG)

Fig 13 Day-to-day comparison of Philadelphia traffic

16

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

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-~ lL ltX f- - shya U a lti I- shy

lL 20 ~ I--

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I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

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I ~

-

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I

taO

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FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

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3 - shy

r-shy~2 - shy

1shy

~r-~

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shy ~ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

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o Z

0

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2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

~7 shy

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I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

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2 + + 3 2 50 2 5 5 At J

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I J J I b b i) b b b 5 J -75 1 3 + 5 I 1

I I 2

~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

-

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6 - -rshylL

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lt -0 U 0 5 - -lt

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z -

shy--

2 fshy -- -

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1-shyI--~-

-

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

Ishy

~-

t -75

-50

25

gt- -25

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V V V V

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1 2 If 5 6 6 7 7 8 8 9 9 A A 8 8 A 9 5 1 1 2 5 5 6 6 6 7 7 7 1 9 A 8 8 B 8 3

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4f 3 ~

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-

-

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-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-7 LA map TMF8055

A-9

- -

8 I I r- r J I I I

--4-20467 L ~7 shy

I shy

I- CENTERPOINT -5 nmi -15 nmi _6 ~

f shy

~shy 5 shy

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-rshy

~ f-f- shy2 - shy

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~ ~-~ -I shy

- nTh+-_ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

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1 9 A A b B B 8 8 3 1 8 J 9 A A 9 9 A

0 C B 7 6 33 3 2 1 B A 8 6 3 2 3 3 2

gt- -25 - 3 5 6 7 8 9 8 9 9 1 2 5 5 6 1 1 8 8 8

A 9 2 1 5 2 1 2

1 2 2 2 1 3 3 3 2 1 -

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-50 - 1 233 3 2 1 222 1 -223 If 2 1 1 12 3 1 t

2 3 3 1 1 2 1

-75 ~ -

I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

35 ~ shy

I-r-

rshy -~ IJ 30 ~ shylaquo -a r-u shy -a laquo ~- shyIJ 25 l- I- I- shy0 -a - lshyw CD 20 I- shygt ~

-rshyz ~

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1-shy

r- 0 shy

rshy

-- -05 shy- Ishy

-

mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

~ 1 If 5 6 6 6 9 A B 0 0 0 lt- C B 9 7 5 If

2 3 5 6 6 7 8 A C 0 0 E 0 C B B A 9 7 5 1s ~

2 If If 5 6 7 9 A C 0 E o C 8 A A A 962 ~ o _0 3 5 6 -+-6--amp--e-9--fr~- ~--i---9--8-8 ~ ~ ~ ~ ~

Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

-50 - 332 -shy2 1

-75 1 - shy

1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

~25 shy

Ishy

Ishy~~ 20 shy

0 U Ishy0

r shyltt Ishy

lL ~o I-shylshy

~ Ishyffi 5 shyf-CD

~ gt z

- 0 shy-

05 shy

Ishy

~

h I I I o

10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

~

1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

1 3

1 1 2 2 2

1 3 3 3 3 1 3 2 If If 3 3 2 6 6 6 5 If 3 2

8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

-

--

-

-75 ~

--

-

1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

~

-shyz

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05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

0 --

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6

7

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-75 - 2 3 2 1 -

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-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

-- -

Ishy

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IJ shylaquo 0 I- shyu ~ 0

laquo IJ

3 - shy~ 0 f- shy-0 - l- I-- IshyIJJ shyCD - E I-lshygt shyz

2 - shy~ -f-

-fshy -

~ shy

I- shy

-

J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

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3 6 7 7 7 7 9 A B B 8 A 7 6 7 A A 9 7 5 3 1 f 6 6 6 8 9 A A A 9 6 If If 7 9 9 8 6 3

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-75 Ishy

2 2 I I -I

I I I I I I

-100 -75 -50 -25 o 25 50 75 100 bull

x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

I I lr- I I I I

l-4-204771_ 45 I- r- shy

r shy

~ ~ - CENTER POINT 020 nmi ~r-40 - shy-

shy-r-shy

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rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

3 pound+ It 6 8 8 8 1 e 5 3 1 5 1 1 8 8 6 pound+

2 3 pound+ 5 7 8 8 8 1 6 5 5 5 6 6 6 6 8 I 8 6 2 50 ~ 2 3 5 8 lt) lt) lt) 8 6 2 3 5 7 7 6 6 7 8 lt) lt) 8 5 3 -

2 3 5 8 lt) A lt) 7 6 pound+ 1 8 8 1 5 7 8 8 lt) lt) 1 6 3 ~ 3 5 6 7 7 lt) lt) A A 7 5 3 1 6 8 lt) 7 5 3 5 8 lt) lt) lt) 7 3

1 pound+ 6 1 8 S lt) A lt) A 7 5 pound+ 1 3 lt) lt) 8 3 3 3 5 8 9 9 9 6 5 2 3 6 8 9 lt) lt) lt) lt) 8 lt) 8 lt) 8 6 1 A A lt) 6 7 1 8 9 lt) lt) 7 5 pound+ 2 1

0 0

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2 5 6 6 1 2 5 6 7 8 8 8 1 6 5 6 8 8 1 1 5 It 3 1 1 5 6 6 6 6 6 6 6 5 If 1 1 8 6 5 3 1

3 6 1 1 6 5 2 2 pound+ If If 5 1 1 6 It 2 1 1 5 7 1 6 6 3 2 If 5 6 6 It

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1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

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u 0 0 W (II

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25

20

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rh 90 100

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FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

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-1-4-20480 _

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r 50

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1 3 ~ 5 6 f 6 A C 0 E E A 8 5 1

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ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

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bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

- r- I r r I I I 1 I

l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

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r-

t 30 laquo 0 U g laquo 25 u 0

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o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

--

CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

a w OJ ~ gt z

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20

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40 50

Il (nmil

60

I

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80

I

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bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

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2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

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1 1

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X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

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--

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l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

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bull FigA-26 Boston histogram TMF3008

A-28

flgtAIRCRAFT40 9 001 AIRCRAFT

09~ ~ 0 PER nmi2 003 2

0 9 ~~~ PEAK 007 PER nml 20

~ -= o z -20

E c

-40

-60 TMF 8046 TMF 8055 THURS 1630 PST 111176 MON 1230 PST 111576

40

20a 0 ~

0 s

0 ~ -z -20 E c ~ -40

-60 TMF 8122 TMF 8126 SAT 1400 PST 112076 SUN 130 PST 112176

-60 -40 -20 o 20 40 60 -60 -40 -20 o 20 40 60

X lnmi East Mag) X lnmi East Mag)

Fig7 Day-to-day comparison of LA Basin traffic

9

30 TRAFFIC IN OTHER LOCATIONS

Figures 8 9 and 10 present traffic density maps of respectively Washington DC Philadelphia and Boston As in Fig 1 the sYmbols plotted indicate the local density averaged over the region within 10 nmi of each point The Boston data was recorded with the TMF located at Deer Island a favorable site about 2 nmi east of Logan Airport This site was found to give excellent coverage of the airspace around Boston The Philadelphia data was recorded when the TMF was located near Clementon NJ a site about 15 nmi southeast of Philadelphia International Airport also providing excellent coverage

The Washington data in Fig 8 was recorded with the TMF located at Washington National Airport In this case it was found that an excessive number of targets were recorded at close range -- thought to be primarily false targets due to reflections and imperfect sidelobe suppression Because of this condition all targets with ranges less than 2 nmi were deleted prior to the computation of traffic densities This range filtering was done only in the case of the Washington data

Cumulative range distributions N(R) of aircraft plotted in Fig 11 permit comparisons to be made among sites and among different days at each site Each curve gives the range distribution relative to the location of maximum density The curve marked high density traffic model LAl is discussed in the next section

The day-to-day similarities in LA traffic discussed above in connection with Fig 7 are also apparent here with TMF8l26 having the maximum density It is also seen that TMF8l26 exhibits the maximum density among all of the tapes reduced regardless of location The results exhibit a moderate day-to-day repeatability in each location Although the curve shapes in Fig 11 are all similar certain differences may be noted For example N(lO nmi) results at Boston Philadelphia and Washington are all approximately equal and yet N(60 nmi) results exhibit appreciable differences with Philadelphia exceeding Washington and Washington exceeding Boston In other words the traffic density in Boston falls off rapidly away from the location of peak density while Washington and Philadelphia traffic densities falloff less rapidly In all three cases the distribution beyond 10 nmi is moderately well approximately by a uniform-in-range model with 1 to 2 aircraft per nmi (which is considerably less than the 3 aircraft per nmi of LA)

Density map comparisons showing day-to-day repeatability to Washington Philadelphia and Boston are given in Figs 12 13 and 14 Day-to-day changes in spatial distribution are more evident in the Philadelphia plots as compared with the other locations These changes may be the result of the

10

ATe-80 (8)

MEASUREMENT TMF 4039 MON 24 MAY 1976 1114-1134 EDT

- E

J a 0 z

40

20

0

1

1

1

I

s t

J 1 ( J r 1 ~

- -- L 1 Sshy f 4 6 pound J ( f c~~j

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7 ~

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3 1 I

t 7 s f 1 r 1 f 9

c ~c

bull ~

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8

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3

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J

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1

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t

Z 1

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I t r ( ( ~ sshy f

( ~ S ~

-40 i S

-40 -20 a 20 40 60

X(NMI EAST MAG) KEY -

SYMBOL

123456189ABCDEFGHlJKLMNOPQRST i 11111111 IIIILi iii iii

0001 001 01 1

TRAFFIC DENSITY p (AIRCRAFTINMl2)

Fig8 Traffic density map Washington DC

11

ATe-80 (9)

MEASUREMENT TMF 5026 THURS 24 JUNE 1976 1358-1428 EDTshy

r 7 t bull or r I 7 1 9 q

40

1 z20 3

r r r o

r r r r

Z~

4

3 4

4

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r I I

I

7 J 11 I I shy __ - I I

1tN6E ur _ I P~UNIamp--71IIS ~s_ 1

-60 -4Q -20 o 20 40 60

X(NMI EASTMAGJ

KEY shySYMBOL

1234 56789ABCOE FGH IJ KLMNOPQRST 11111111 IIIILI ~I iii bull ~I

0001 001 01 1

TRAFFIC DENSITYp CAIRCRAFTNMI2)

Fig9 Traffic density map Philadelphia

12

ATe-so (10)

MEASUREMENT TMF 3037 MON 29 MARCH1976 1541-1559 EST

I bull

- ~

lt ~

I t-a 0 Z

i z-gtshy

40

20

O

-20

-40

1 r 7

f r 7

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1 -f 1 ~ 7 if 1

~ ~ ~ 1 ( 1 t

I I 7 7 -A A

I -shy

1 1 8 e 1)

I

1 7 I~

~ bull UJHtN

I IVTAlIshy I

1 7 7 1 ~ 1 p Il shy--------shy7 7 If ~ to ~ ( bull ~--I

11 f7 1 A (

1 ~ A 1 bull 1---

r

f

1

if

bull 6shy

V

l bull Z 1

r z

I z

I

~~c~AFr I yM L I

J I I

I I

z 4 llfmiddot

J l~~

~Ifv1~

-40 -20 0 20 40

XCNMI EAST MAGJ

KEY -SYMBOL

12345678 9ABCDE FGH I J K LMNOPQRS T I I I I I I I I I I I I I l-I i i i V

0001 001 01 1

TRAFFIC DENSITYp (AlRCRAFTNMl2 )

FigIO Traffic density map Boston

13

1000

l18-4-19158 L LA HIGH DENSITY

TRAFFIC MODEL LA

0

W () Z ~ 0

Z I 100 t shy

~

t shy~

~ 0 U Q

ltt ~

o Q W m ~ 10 Z

w () ~ Q W

~

1 _---_--1_6---1-- shy

201052

RANGE R (nmi)

Fig11 Traffic distributions

bull J

6-----

50 100

in range

14

(

CI ~ ~

~

=E ~

IL 0 z ~ a ~

E c

gtshy

Ishy

Fig12

40

20

0

-40 TMF 4001 THURS MAY 6 1976

40

20

-20

-40

40

20

TMF 4045 FRI MAY 28 1976

-60 -40 -20

-40

-20

C42-1705

1600 EDT

40

1300 EDT

0 20 40 60

x (nmi EAST OF TMF MAG)

Day-to-day comparison of Washington traffic

15

C42-1706

40

20

O~---+---++W---------i

-20 )

TMF 5005 -40 TUES JUNE 15 1976 1000 EDT

C)

lt 4i

u i 0 ~

I a 0 z E c

~

40

20

O~---f--l~_~----------l

-20

-40

x (nml EAST OF TMF MAG)

Fig 13 Day-to-day comparison of Philadelphia traffic

16

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

-~Z 30 I- shyf shy

-~ lL ltX f- - shya U a lti I- shy

lL 20 ~ I--

shyo a -- f-_ w -00 ~ -I shy -shyJ shyZ

I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

-1-4-20460 shy

fshy -

-50

~

cshy o Z

E c

50

o

f shy

~

I

2

I

I I

I 1 3 t 3 1 1

1 3 t 6 7 5 3 3 2 5 t 5 7 A A A 9 6 I 6

6 9 8 C 0 C A 6 3 5 7 C C E F E 0 8 9 8 C

2 7 9 C E G G G F 0 0 0 E 5 8 8 o E F G H G E E F F 7 9 Il euro --iH-6 II 6 amp--shy7 8 9 8 8 0 F G H I I I I 5 7 8 8 8 9 8 F H I J J J I 3 I I 3 2 3 C F r J J J

9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

I 5 6 5 2 3 3 2

I

I I I 2 I

I 2 3 2 I 2 2 2 t t 3 2

2 2 3 t ~ 6 r 2 2 2 3 3 5 6 D t I

6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

6 F F E [)-euro-- euro--iHt-amp---tr--6--tr-4 H G F E C C A A 9 7 6 6 6 6 I

I H l 0 8 A987t3t31 H G F C A 66132 G F E C 9 I 232 0 0 C C 8 9 7 2 ~ 5 I

9 8 C C C 8 A 8 7 7 6 t

5 8 A C C C 8 8 A 8 8 6 1

6 7 9 8 C C 8 A 9 8 6 t

1 3 5 6 7 9 8 8 B B 7 6 I

3 I 6 9 B B 9 8 5 3 3 5 7 9 9 9 6 3

1 1 I 3 6 7 6 3 1 I

I ~

-

-

-

-

- -

-100

I I

-50 I

o I I

50

I

taO

X (nmi East 1 Mag)

FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

E

c CJ

7 ~ shyI I shyU ~

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6 l- shy l shylJ I shyltt a

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W CD

~

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z ~ - - shy

3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

2 If 6 888 8 C C 9 6 t 3 If A C 0 o C 8 8 It 8 8 7 6 6 6 If

2 t 7 9 888 DEE C A A It 8 E F F F 0 C 8 A A A 9 7 7 6 If 2 rshy~

o Z

0

2 5 8 9 ABC 0 E F FED 0 o E 379 A ceo 0 E F G G F G F F- - - - -

If 8 9 9 Ace 0 F F H H H H H

G G G G E 0 B A A A 9 9 8 7 5 G H G F E C A B 8 A 9 8 8 6 5

- r v bull v

H G FEe C A A 9 7 656 5 5

2

E c-

2 6 8 8 A A 8 C E G H I I 3lf5776AE G H I

I I

I I

H F C 8 899 7 6 2 1 If H G C 9 776 2

If

1 3

1 2 1 8 E F G H H GEe 9 5 5 2 gt- - 25 - 3 A C C 0 F E 0 C It A 8 5 5 5 2 -

5 8 8 7 A B 888 A A 9 7 6 3 If 6 6 1 6 9 A 8 8 8 A 8 5 1 2 5 If 1 1 2 7 A 8 B 8 8 5 2

2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

~7 shy

r-

t- ~~

~ ltt a 6 ~ shyu 0 r-I shy

lti r shy

~

0 ~

5 shyr-a

~

shyw CD ~ - shygt -

4 shyz fshy -

rshy

-1--shy~ -

I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

75

I 2 2 I 3 J 2

2 + + 3 2 50 2 5 5 At J

I 3 2 I 2 + 5 5 5 2 3 At At At 3 + 5 Igt 5 + 1 1

I 3 5 6 6 7 Igt 8 5 5 3 I 2 3 2 1 2 3 At 6 8 8 8 1 2 Igt 8 8 l 2 I I + J I

25 I 2 2 5 A B A 1 Igt 1 7 1 5 5 6 Igt 5 3 1 2 3 3 1 CO D I I I At 8 A C C 8 8 + 3 I A 8 8 8 A 8 1 5 5 Igt 8 7 7 5 2 2 2 3 6 9 B C E E 0 C 9 8 A 0 0 0 0 8 A 1 Igt 1 1 8 8 7 5 2 ~ 2 At It 6 8 A C E F F F E 0 C C E F E 0 A 9 Igt Igt 7 7 7 7 5 1 ~ 0 Z

a 2 It

It

5

6

6

7

8

8

8

9

B C E F H I H GEE -++-t-j-fmiddot-~ oF-

A B C F H r J I H G

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8

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7

9

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8

7

8

6

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7 8 Igt 7 It 5

3

9 A A D G I I r I 4

7 8 9 9 0 G H H 11

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5

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5 5 + 3

3 3 2 2

I 3 + 5 1 9 9 9 8 A II A A II A 9 7 5 5 5 + I I I 3 + 5 7 8 8 9 8 r 889 A A ~ 8 8 7 5 1

2 3 3 + 6 Igt Igt 7 8 9 8 5 2 l 1 9 A A 9 7 5 I

2 3 3 57768A4 A I J 5 9 A 8 1 5

-50 2 3 I

3 5 2

Igt 5 1

7 Igt

7 5 5

7 1

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8

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9

A

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8

1

8

5

1 J 5

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If

6 b

(I A II

7 9

A II

9

9 7

9 7 t

6 1

I + 5 5 Igt 7 II 8 7 7 b b 7 Igt It

I J J I b b i) b b b 5 J -75 1 3 + 5 I 1

I I 2

~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

-

7 CENTERPOINT -20 nmi -5 nmi -

6 - -rshylL

r shy _

lt -0 U 0 5 - -lt

lL _ r-

o -0 W 4 - -CD ~ ~ r-

z -

shy--

2 fshy -- -

rshy -

1-shyI--~-

-

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

Ishy

~-

t -75

-50

25

gt- -25

r-o 0 z

E c

1

1 1 2

A bull amp

1

2 2 2 1 If

2

2 2 2 2 4f

If bull

2

1

3 2 4f

5 1 V

4f

3

1 2 2 5 5 1 8 A V

6 If 2

1 2 1 1 3 3 2 2 1 7 3 2 2 2 2 5 6 6 5 3 1 6 7 7 3 2 3 2 2 1 6 8 9 9 8 4f 1 6 6 7 3 5 4f 4f 4f 1 1 7 9 B B A 8 poundf 2 3 At 9 7 8 8 8 6 6 At 4f 5 6 7 8 A C 0 C B 9 8 A A C 0 C 8 B 9 8 1 1 1 1 8 9 B C 0 0 0 0 C C 0 E E E o D B A 9 8 1 1 1 9 A C E F F E 0 E E F F E E 0 C 8 A 8 1 6 6 A - - shy - r _ A

V V V V

1 8 B E F G G G G G o C C B B 8 A 9 1 5 3 3 5 6 8 C F G G H H H G F 0 C 8 8 A 9 1 At 2 1 3 If 5 9 0 F G H H I H G F C C 8 9 8 6 3 2 L 3 6 A C E F Ii H H G E C 8 A 9 1 6 3

2 2 It 7 9 8 C 0 E F F 0 C B A 9 9 7 6 1 2 3 If 6 7 7 8 9 C C B A A B A A 8 7 5

1 2 If 5 6 6 7 7 8 8 9 9 A A 8 8 A 9 5 1 1 2 5 5 6 6 6 7 7 7 1 9 A 8 8 B 8 3

3 It If It At At If 5 5 6 8 A A A 9 3 1 2 2 2 2 1 2 3 t 6 8 A A 8 t

2 t 6 9 8 A 8 5 1 I 3 3 3 8 9 9 A 7 At

I 1 3 It t 1 1 8 8 3 1 2 3 If 2 1 5 6

I 1 1

7 8 7 7

3

5 6 6

5

2

3 At

4f 3 ~

1

1 1

-

-

-

-

I I I J I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-7 LA map TMF8055

A-9

- -

8 I I r- r J I I I

--4-20467 L ~7 shy

I shy

I- CENTERPOINT -5 nmi -15 nmi _6 ~

f shy

~shy 5 shy

IJ I- shyltX ~

n u I shyn

I shyltX r- r shy

~ ~- shyIJ o

l- f shy0 W CD ~ ~ ~ ~ z 3 - - shy

-rshy

~ f-f- shy2 - shy

-f- shy

~ ~-~ -I shy

- nTh+-_ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

2 3 3 6 1 881 665 6 6 6 6 It 1 1 3 5 6 1 8 9 981 888 8 1 1 6 ~

1 1 1 3 5 8 A 8 8 988 999 9 1 5 3 1 1 3 3 1 1 3 5 6 9 8 C D 989 A A 9 8 5 2 3 3 3 2

25 - 1 3 5 5 2 2 3 6 9 C o U A 9 A A 8 9 6 If 2 3 4f It 3 -1 3 5 5 6 5 1 A C o 0 888 889 6 If It 2

5 6 5 6 A 0 f E 0 C 8 C C 8 9 6 5 5 5 3 1 ~ 2 If 5 5 1 C E F F E o C 8 8 8 9 1 5 5 3 3 2

Lshy~

o z

0 1 1 12236 8 0 F F F E shy bull v

1 1 8 A A C 0 0 o 0

E 0 8 8 A A 1 5 - ~ v v

E C C 9 8 8 If

3 3 If If 2

3 1

2

E c

1 9 A A b B B 8 8 3 1 8 J 9 A A 9 9 A

0 C B 7 6 33 3 2 1 B A 8 6 3 2 3 3 2

gt- -25 - 3 5 6 7 8 9 8 9 9 1 2 5 5 6 1 1 8 8 8

A 9 2 1 5 2 1 2

1 2 2 2 1 3 3 3 2 1 -

5 6 6 5 5 6 7 1 1 6 222 2 3 3 3 2 1 3 5 6 6 6 5 5 5 5 5 If 3 1 122 3 3 2 1 3 5 6 6 5 5 3 If If 2 1 1 2 1 1 2 5 2 1 If 3 3 2 1 122 1

-50 - 1 233 3 2 1 222 1 -223 If 2 1 1 12 3 1 t

2 3 3 1 1 2 1

-75 ~ -

I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

35 ~ shy

I-r-

rshy -~ IJ 30 ~ shylaquo -a r-u shy -a laquo ~- shyIJ 25 l- I- I- shy0 -a - lshyw CD 20 I- shygt ~

-rshyz ~

- -15 - -~ ~ shyrshy

1-shy

r- 0 shy

rshy

-- -05 shy- Ishy

-

mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

~ 1 If 5 6 6 6 9 A B 0 0 0 lt- C B 9 7 5 If

2 3 5 6 6 7 8 A C 0 0 E 0 C B B A 9 7 5 1s ~

2 If If 5 6 7 9 A C 0 E o C 8 A A A 962 ~ o _0 3 5 6 -+-6--amp--e-9--fr~- ~--i---9--8-8 ~ ~ ~ ~ ~

Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

-50 - 332 -shy2 1

-75 1 - shy

1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

~25 shy

Ishy

Ishy~~ 20 shy

0 U Ishy0

r shyltt Ishy

lL ~o I-shylshy

~ Ishyffi 5 shyf-CD

~ gt z

- 0 shy-

05 shy

Ishy

~

h I I I o

10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

~

1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

1 3

1 1 2 2 2

1 3 3 3 3 1 3 2 If If 3 3 2 6 6 6 5 If 3 2

8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

-

--

-

-75 ~

--

-

1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

~

-shyz

10 ~ shy-

05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

0 --

3 5

- shy6 5 5

6

7

7

-9

A

A

n

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n

8

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9

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8

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7 8

9

9 A A

C 8 C 0

8 0

A

8 9 9

8 7

6 3

2 2

2

2

2

2

2 2 2 3 1

1 1 If 5 7 9 8 C 8 8 9 9 C C 8 A 7 3 1 1 gtshy -25 ~ 1 1 2 7 A C C C 8 A A 9 8 8 9 6 -

2 3 3 3 If 6 A C C C A A 9 9 9 9 5 2 3 If 5 5 6 9 8 8 A 8 8 8 9 7 If

2 If 6 6 6 6 7 8 8 7 5 5 7 7 5 3 2 If 6 6 6 5 If 6 6 5 6 6 7 6 If

-50 ~ If 5 6 5 2 3 5 6 8 7 7 3 -2 If If 2 5 7 8 7 6

1 3 6 T 7 6 If

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2 If 5 5 If 2

-75 - 2 3 2 1 -

I I ~J I 1 I i I I A shy

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

-- -

Ishy

-4 shy- shy

IJ shylaquo 0 I- shyu ~ 0

laquo IJ

3 - shy~ 0 f- shy-0 - l- I-- IshyIJJ shyCD - E I-lshygt shyz

2 - shy~ -f-

-fshy -

~ shy

I- shy

-

J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

Lshy ~

o Z

0

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5 f ~ 2

5 5

l

6 5

1

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1

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9

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U

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8 8 C

C C 8 9 A 9 8 T 5 5 5 f It 3 1 eBB B B A 9 7 5 5 5 5 5 5 3 A A A A bull - shy - - shy - ~ u U _JJJoJamp

C 8 A A A A 8 5 5 5 5 5 5 + 3

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1 2

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f

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9

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3

3 It 6 6 6 6 7 8 A amp 8 8 A A A 9 9 9 8 i 6 3 1 2 3 3 2 gt- -25 ~ 3 Ii 7 7 1 7 8 9 B B 8 B A lt1 8 8 9 9 8 7 + 1 -

3 6 7 7 7 7 9 A B B 8 A 7 6 7 A A 9 7 5 3 1 f 6 6 6 8 9 A A A 9 6 If If 7 9 9 8 6 3

3 It 6 8 9 9 9 9 8 7 5 3 + 7 8 8 6 2 3 6 8 8 8 6 5 3 3 2 + 6 6 It

-50 ~ 1 It 6 7 T It 2 2 2 2 2 3 + 1 -2 + 5 2 I 1 I I 3 3 2

I I 2 3 1 2 1 I 3 3 2 1

-75 Ishy

2 2 I I -I

I I I I I I

-100 -75 -50 -25 o 25 50 75 100 bull

x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

I I lr- I I I I

l-4-204771_ 45 I- r- shy

r shy

~ ~ - CENTER POINT 020 nmi ~r-40 - shy-

shy-r-shy

rshy35 - r- shy

r- _rshy -~ ~ 30 ~ - - shyoCt

Ir shy ~ 0 U 0 oCt

rshy25 r- shy

0 ~

0 r- shyr-W

m 20 shyE - - shygt z

- r-- shy15 r- shy-

I shy

10 - - shyI shy

-rshy-r shy

05 - - shy

- ~

rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

3 pound+ It 6 8 8 8 1 e 5 3 1 5 1 1 8 8 6 pound+

2 3 pound+ 5 7 8 8 8 1 6 5 5 5 6 6 6 6 8 I 8 6 2 50 ~ 2 3 5 8 lt) lt) lt) 8 6 2 3 5 7 7 6 6 7 8 lt) lt) 8 5 3 -

2 3 5 8 lt) A lt) 7 6 pound+ 1 8 8 1 5 7 8 8 lt) lt) 1 6 3 ~ 3 5 6 7 7 lt) lt) A A 7 5 3 1 6 8 lt) 7 5 3 5 8 lt) lt) lt) 7 3

1 pound+ 6 1 8 S lt) A lt) A 7 5 pound+ 1 3 lt) lt) 8 3 3 3 5 8 9 9 9 6 5 2 3 6 8 9 lt) lt) lt) lt) 8 lt) 8 lt) 8 6 1 A A lt) 6 7 1 8 9 lt) lt) 7 5 pound+ 2 1

0 0

25 ~ pound+

pound+

6 5

8 7

8 8

9 8

lt)

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lt)

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6 5

If

1 2 3

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2 5 6 6 1 2 5 6 7 8 8 8 1 6 5 6 8 8 1 1 5 It 3 1 1 5 6 6 6 6 6 6 6 5 If 1 1 8 6 5 3 1

3 6 1 1 6 5 2 2 pound+ If If 5 1 1 6 It 2 1 1 5 7 1 6 6 3 2 If 5 6 6 It

-50 - 1 pound+ 6 1 5 3 1 1 3 If If If 3 -3 If 5 1 2 2 2 If If 3

1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

~ u lt 0 U 0 lt

u 0 0 W (II

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30

25

20

15

-

-

-

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10 -

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o 10 20 30 40 50 60 70 80

rh 90 100

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FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

s shy~

00 2

E c-gt -25

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f r

-

2 2 3 5 5 2

6 5 6 1 3 6 6 1 1 1 5 1 8 If 2 1 1 1 8 9 8 6 6 8 8 If 2 2

1 3 9 9 A 1 7 1 1 1 - 3 3 2 If 5 6 8 8 8 9 8 6 2 If If 3 2

q t II) 6 8 8 9 f T 5 t Cgt 3 1 ~ 1 If 5 T 9 A e a 8 8 6 It 3 5 5 5 5 1 9 8 C C 8 9 8 6

1 3 ~ 5 6 f 6 A C 0 E E A 8 5 1

1 5 7 1 8 ( 9 8 o E F F C 8 2 2 1 ~

ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

1 If 5 8 8 816 8 7 5 3 3 5 6 1 716 1 1 6 3

1 3 1 1 8 IJ 8 1 5 If 1 1 5 8 8 8 6 5 2 1

3 0 7 16 If 3 i If b If

1 1

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-75 - -

-100 I I

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25

I

50

I

75 100

bull x (nmi East Mag)

bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

- r- I r r I I I 1 I

l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

35 ~ -

r-

t 30 laquo 0 U g laquo 25 u 0

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15

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10 - -shy

~ -

05

- shy - -

~

~l I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

--

CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

a w OJ ~ gt z

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20

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o 10 20 30

RANGE

40 50

Il (nmil

60

I

70 I

80

I

90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

1 It 5 6 6 7 7 9 A 0 0 2 It 5 6 7 7 7 7 9 A A

2 It 5 II 6 6 5 It 7 8 7 2 It 5 It 3 3 If 3 If If 3 I 2 3 2 2 3 2 1 I I 2 3 2 1 I

1 1

2 3 ~

It 5 6 5 6 6 6 t 5 6 5 5 It 3 7 J

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-75 Ishy -

bull bull

-100 I

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-50 -25 0 25

X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

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--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

0 15 ~ - shyw CD E shygt z

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~-~

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I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

30 TRAFFIC IN OTHER LOCATIONS

Figures 8 9 and 10 present traffic density maps of respectively Washington DC Philadelphia and Boston As in Fig 1 the sYmbols plotted indicate the local density averaged over the region within 10 nmi of each point The Boston data was recorded with the TMF located at Deer Island a favorable site about 2 nmi east of Logan Airport This site was found to give excellent coverage of the airspace around Boston The Philadelphia data was recorded when the TMF was located near Clementon NJ a site about 15 nmi southeast of Philadelphia International Airport also providing excellent coverage

The Washington data in Fig 8 was recorded with the TMF located at Washington National Airport In this case it was found that an excessive number of targets were recorded at close range -- thought to be primarily false targets due to reflections and imperfect sidelobe suppression Because of this condition all targets with ranges less than 2 nmi were deleted prior to the computation of traffic densities This range filtering was done only in the case of the Washington data

Cumulative range distributions N(R) of aircraft plotted in Fig 11 permit comparisons to be made among sites and among different days at each site Each curve gives the range distribution relative to the location of maximum density The curve marked high density traffic model LAl is discussed in the next section

The day-to-day similarities in LA traffic discussed above in connection with Fig 7 are also apparent here with TMF8l26 having the maximum density It is also seen that TMF8l26 exhibits the maximum density among all of the tapes reduced regardless of location The results exhibit a moderate day-to-day repeatability in each location Although the curve shapes in Fig 11 are all similar certain differences may be noted For example N(lO nmi) results at Boston Philadelphia and Washington are all approximately equal and yet N(60 nmi) results exhibit appreciable differences with Philadelphia exceeding Washington and Washington exceeding Boston In other words the traffic density in Boston falls off rapidly away from the location of peak density while Washington and Philadelphia traffic densities falloff less rapidly In all three cases the distribution beyond 10 nmi is moderately well approximately by a uniform-in-range model with 1 to 2 aircraft per nmi (which is considerably less than the 3 aircraft per nmi of LA)

Density map comparisons showing day-to-day repeatability to Washington Philadelphia and Boston are given in Figs 12 13 and 14 Day-to-day changes in spatial distribution are more evident in the Philadelphia plots as compared with the other locations These changes may be the result of the

10

ATe-80 (8)

MEASUREMENT TMF 4039 MON 24 MAY 1976 1114-1134 EDT

- E

J a 0 z

40

20

0

1

1

1

I

s t

J 1 ( J r 1 ~

- -- L 1 Sshy f 4 6 pound J ( f c~~j

I ~ i f

~ ~l l C D I bull A C- 1gt

7 ~

~ 4 45 bull bull ~ ~ 1 1 amp

3 1 I

t 7 s f 1 r 1 f 9

c ~c

bull ~

bull t

8

4shy

3

4shy

J

7

1

z

I

1

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t

Z 1

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gtshy-20

I t r ( ( ~ sshy f

( ~ S ~

-40 i S

-40 -20 a 20 40 60

X(NMI EAST MAG) KEY -

SYMBOL

123456189ABCDEFGHlJKLMNOPQRST i 11111111 IIIILi iii iii

0001 001 01 1

TRAFFIC DENSITY p (AIRCRAFTINMl2)

Fig8 Traffic density map Washington DC

11

ATe-80 (9)

MEASUREMENT TMF 5026 THURS 24 JUNE 1976 1358-1428 EDTshy

r 7 t bull or r I 7 1 9 q

40

1 z20 3

r r r o

r r r r

Z~

4

3 4

4

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1tN6E ur _ I P~UNIamp--71IIS ~s_ 1

-60 -4Q -20 o 20 40 60

X(NMI EASTMAGJ

KEY shySYMBOL

1234 56789ABCOE FGH IJ KLMNOPQRST 11111111 IIIILI ~I iii bull ~I

0001 001 01 1

TRAFFIC DENSITYp CAIRCRAFTNMI2)

Fig9 Traffic density map Philadelphia

12

ATe-so (10)

MEASUREMENT TMF 3037 MON 29 MARCH1976 1541-1559 EST

I bull

- ~

lt ~

I t-a 0 Z

i z-gtshy

40

20

O

-20

-40

1 r 7

f r 7

~ -f r r 6 I

1 -f 1 ~ 7 if 1

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I I 7 7 -A A

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1 1 8 e 1)

I

1 7 I~

~ bull UJHtN

I IVTAlIshy I

1 7 7 1 ~ 1 p Il shy--------shy7 7 If ~ to ~ ( bull ~--I

11 f7 1 A (

1 ~ A 1 bull 1---

r

f

1

if

bull 6shy

V

l bull Z 1

r z

I z

I

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J I I

I I

z 4 llfmiddot

J l~~

~Ifv1~

-40 -20 0 20 40

XCNMI EAST MAGJ

KEY -SYMBOL

12345678 9ABCDE FGH I J K LMNOPQRS T I I I I I I I I I I I I I l-I i i i V

0001 001 01 1

TRAFFIC DENSITYp (AlRCRAFTNMl2 )

FigIO Traffic density map Boston

13

1000

l18-4-19158 L LA HIGH DENSITY

TRAFFIC MODEL LA

0

W () Z ~ 0

Z I 100 t shy

~

t shy~

~ 0 U Q

ltt ~

o Q W m ~ 10 Z

w () ~ Q W

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1 _---_--1_6---1-- shy

201052

RANGE R (nmi)

Fig11 Traffic distributions

bull J

6-----

50 100

in range

14

(

CI ~ ~

~

=E ~

IL 0 z ~ a ~

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gtshy

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Fig12

40

20

0

-40 TMF 4001 THURS MAY 6 1976

40

20

-20

-40

40

20

TMF 4045 FRI MAY 28 1976

-60 -40 -20

-40

-20

C42-1705

1600 EDT

40

1300 EDT

0 20 40 60

x (nmi EAST OF TMF MAG)

Day-to-day comparison of Washington traffic

15

C42-1706

40

20

O~---+---++W---------i

-20 )

TMF 5005 -40 TUES JUNE 15 1976 1000 EDT

C)

lt 4i

u i 0 ~

I a 0 z E c

~

40

20

O~---f--l~_~----------l

-20

-40

x (nml EAST OF TMF MAG)

Fig 13 Day-to-day comparison of Philadelphia traffic

16

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

-~Z 30 I- shyf shy

-~ lL ltX f- - shya U a lti I- shy

lL 20 ~ I--

shyo a -- f-_ w -00 ~ -I shy -shyJ shyZ

I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

-1-4-20460 shy

fshy -

-50

~

cshy o Z

E c

50

o

f shy

~

I

2

I

I I

I 1 3 t 3 1 1

1 3 t 6 7 5 3 3 2 5 t 5 7 A A A 9 6 I 6

6 9 8 C 0 C A 6 3 5 7 C C E F E 0 8 9 8 C

2 7 9 C E G G G F 0 0 0 E 5 8 8 o E F G H G E E F F 7 9 Il euro --iH-6 II 6 amp--shy7 8 9 8 8 0 F G H I I I I 5 7 8 8 8 9 8 F H I J J J I 3 I I 3 2 3 C F r J J J

9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

I 5 6 5 2 3 3 2

I

I I I 2 I

I 2 3 2 I 2 2 2 t t 3 2

2 2 3 t ~ 6 r 2 2 2 3 3 5 6 D t I

6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

6 F F E [)-euro-- euro--iHt-amp---tr--6--tr-4 H G F E C C A A 9 7 6 6 6 6 I

I H l 0 8 A987t3t31 H G F C A 66132 G F E C 9 I 232 0 0 C C 8 9 7 2 ~ 5 I

9 8 C C C 8 A 8 7 7 6 t

5 8 A C C C 8 8 A 8 8 6 1

6 7 9 8 C C 8 A 9 8 6 t

1 3 5 6 7 9 8 8 B B 7 6 I

3 I 6 9 B B 9 8 5 3 3 5 7 9 9 9 6 3

1 1 I 3 6 7 6 3 1 I

I ~

-

-

-

-

- -

-100

I I

-50 I

o I I

50

I

taO

X (nmi East 1 Mag)

FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

E

c CJ

7 ~ shyI I shyU ~

ltt ~ -shyw Z I- shy

6 l- shy l shylJ I shyltt a

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4 lJ 0 I shy

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W CD

~

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z ~ - - shy

3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

2 If 6 888 8 C C 9 6 t 3 If A C 0 o C 8 8 It 8 8 7 6 6 6 If

2 t 7 9 888 DEE C A A It 8 E F F F 0 C 8 A A A 9 7 7 6 If 2 rshy~

o Z

0

2 5 8 9 ABC 0 E F FED 0 o E 379 A ceo 0 E F G G F G F F- - - - -

If 8 9 9 Ace 0 F F H H H H H

G G G G E 0 B A A A 9 9 8 7 5 G H G F E C A B 8 A 9 8 8 6 5

- r v bull v

H G FEe C A A 9 7 656 5 5

2

E c-

2 6 8 8 A A 8 C E G H I I 3lf5776AE G H I

I I

I I

H F C 8 899 7 6 2 1 If H G C 9 776 2

If

1 3

1 2 1 8 E F G H H GEe 9 5 5 2 gt- - 25 - 3 A C C 0 F E 0 C It A 8 5 5 5 2 -

5 8 8 7 A B 888 A A 9 7 6 3 If 6 6 1 6 9 A 8 8 8 A 8 5 1 2 5 If 1 1 2 7 A 8 B 8 8 5 2

2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

~7 shy

r-

t- ~~

~ ltt a 6 ~ shyu 0 r-I shy

lti r shy

~

0 ~

5 shyr-a

~

shyw CD ~ - shygt -

4 shyz fshy -

rshy

-1--shy~ -

I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

75

I 2 2 I 3 J 2

2 + + 3 2 50 2 5 5 At J

I 3 2 I 2 + 5 5 5 2 3 At At At 3 + 5 Igt 5 + 1 1

I 3 5 6 6 7 Igt 8 5 5 3 I 2 3 2 1 2 3 At 6 8 8 8 1 2 Igt 8 8 l 2 I I + J I

25 I 2 2 5 A B A 1 Igt 1 7 1 5 5 6 Igt 5 3 1 2 3 3 1 CO D I I I At 8 A C C 8 8 + 3 I A 8 8 8 A 8 1 5 5 Igt 8 7 7 5 2 2 2 3 6 9 B C E E 0 C 9 8 A 0 0 0 0 8 A 1 Igt 1 1 8 8 7 5 2 ~ 2 At It 6 8 A C E F F F E 0 C C E F E 0 A 9 Igt Igt 7 7 7 7 5 1 ~ 0 Z

a 2 It

It

5

6

6

7

8

8

8

9

B C E F H I H GEE -++-t-j-fmiddot-~ oF-

A B C F H r J I H G

F FEe 8 9-9- f Dell a 8 9

8

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7

9

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7

8

6

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7 8 Igt 7 It 5

3

9 A A D G I I r I 4

7 8 9 9 0 G H H 11

66669CE G 2 + At + 7 9 A A C 0

G E C 1 G E f A

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7 7 5

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5 5 + 3

3 3 2 2

I 3 + 5 1 9 9 9 8 A II A A II A 9 7 5 5 5 + I I I 3 + 5 7 8 8 9 8 r 889 A A ~ 8 8 7 5 1

2 3 3 + 6 Igt Igt 7 8 9 8 5 2 l 1 9 A A 9 7 5 I

2 3 3 57768A4 A I J 5 9 A 8 1 5

-50 2 3 I

3 5 2

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7 Igt

7 5 5

7 1

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8

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9

A

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8

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8

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6 b

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7 9

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9

9 7

9 7 t

6 1

I + 5 5 Igt 7 II 8 7 7 b b 7 Igt It

I J J I b b i) b b b 5 J -75 1 3 + 5 I 1

I I 2

~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

-

7 CENTERPOINT -20 nmi -5 nmi -

6 - -rshylL

r shy _

lt -0 U 0 5 - -lt

lL _ r-

o -0 W 4 - -CD ~ ~ r-

z -

shy--

2 fshy -- -

rshy -

1-shyI--~-

-

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

Ishy

~-

t -75

-50

25

gt- -25

r-o 0 z

E c

1

1 1 2

A bull amp

1

2 2 2 1 If

2

2 2 2 2 4f

If bull

2

1

3 2 4f

5 1 V

4f

3

1 2 2 5 5 1 8 A V

6 If 2

1 2 1 1 3 3 2 2 1 7 3 2 2 2 2 5 6 6 5 3 1 6 7 7 3 2 3 2 2 1 6 8 9 9 8 4f 1 6 6 7 3 5 4f 4f 4f 1 1 7 9 B B A 8 poundf 2 3 At 9 7 8 8 8 6 6 At 4f 5 6 7 8 A C 0 C B 9 8 A A C 0 C 8 B 9 8 1 1 1 1 8 9 B C 0 0 0 0 C C 0 E E E o D B A 9 8 1 1 1 9 A C E F F E 0 E E F F E E 0 C 8 A 8 1 6 6 A - - shy - r _ A

V V V V

1 8 B E F G G G G G o C C B B 8 A 9 1 5 3 3 5 6 8 C F G G H H H G F 0 C 8 8 A 9 1 At 2 1 3 If 5 9 0 F G H H I H G F C C 8 9 8 6 3 2 L 3 6 A C E F Ii H H G E C 8 A 9 1 6 3

2 2 It 7 9 8 C 0 E F F 0 C B A 9 9 7 6 1 2 3 If 6 7 7 8 9 C C B A A B A A 8 7 5

1 2 If 5 6 6 7 7 8 8 9 9 A A 8 8 A 9 5 1 1 2 5 5 6 6 6 7 7 7 1 9 A 8 8 B 8 3

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4f 3 ~

1

1 1

-

-

-

-

I I I J I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-7 LA map TMF8055

A-9

- -

8 I I r- r J I I I

--4-20467 L ~7 shy

I shy

I- CENTERPOINT -5 nmi -15 nmi _6 ~

f shy

~shy 5 shy

IJ I- shyltX ~

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l- f shy0 W CD ~ ~ ~ ~ z 3 - - shy

-rshy

~ f-f- shy2 - shy

-f- shy

~ ~-~ -I shy

- nTh+-_ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

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Lshy~

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gt- -25 - 3 5 6 7 8 9 8 9 9 1 2 5 5 6 1 1 8 8 8

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2 3 3 1 1 2 1

-75 ~ -

I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

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1-shy

r- 0 shy

rshy

-- -05 shy- Ishy

-

mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

~ 1 If 5 6 6 6 9 A B 0 0 0 lt- C B 9 7 5 If

2 3 5 6 6 7 8 A C 0 0 E 0 C B B A 9 7 5 1s ~

2 If If 5 6 7 9 A C 0 E o C 8 A A A 962 ~ o _0 3 5 6 -+-6--amp--e-9--fr~- ~--i---9--8-8 ~ ~ ~ ~ ~

Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

-50 - 332 -shy2 1

-75 1 - shy

1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

~25 shy

Ishy

Ishy~~ 20 shy

0 U Ishy0

r shyltt Ishy

lL ~o I-shylshy

~ Ishyffi 5 shyf-CD

~ gt z

- 0 shy-

05 shy

Ishy

~

h I I I o

10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

~

1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

1 3

1 1 2 2 2

1 3 3 3 3 1 3 2 If If 3 3 2 6 6 6 5 If 3 2

8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

-

--

-

-75 ~

--

-

1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

~

-shyz

10 ~ shy-

05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

0 --

3 5

- shy6 5 5

6

7

7

-9

A

A

n

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n

8

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8

n

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9

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9

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7 8

9

9 A A

C 8 C 0

8 0

A

8 9 9

8 7

6 3

2 2

2

2

2

2

2 2 2 3 1

1 1 If 5 7 9 8 C 8 8 9 9 C C 8 A 7 3 1 1 gtshy -25 ~ 1 1 2 7 A C C C 8 A A 9 8 8 9 6 -

2 3 3 3 If 6 A C C C A A 9 9 9 9 5 2 3 If 5 5 6 9 8 8 A 8 8 8 9 7 If

2 If 6 6 6 6 7 8 8 7 5 5 7 7 5 3 2 If 6 6 6 5 If 6 6 5 6 6 7 6 If

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1 3 6 T 7 6 If

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2 If 5 5 If 2

-75 - 2 3 2 1 -

I I ~J I 1 I i I I A shy

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

-- -

Ishy

-4 shy- shy

IJ shylaquo 0 I- shyu ~ 0

laquo IJ

3 - shy~ 0 f- shy-0 - l- I-- IshyIJJ shyCD - E I-lshygt shyz

2 - shy~ -f-

-fshy -

~ shy

I- shy

-

J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

Lshy ~

o Z

0

3 2 ~ 1

5 f ~ 2

5 5

l

6 5

1

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1

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9

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U

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8 8 C

C C 8 9 A 9 8 T 5 5 5 f It 3 1 eBB B B A 9 7 5 5 5 5 5 5 3 A A A A bull - shy - - shy - ~ u U _JJJoJamp

C 8 A A A A 8 5 5 5 5 5 5 + 3

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1 2

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f

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9

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+ 5 5 5 +

3

3 It 6 6 6 6 7 8 A amp 8 8 A A A 9 9 9 8 i 6 3 1 2 3 3 2 gt- -25 ~ 3 Ii 7 7 1 7 8 9 B B 8 B A lt1 8 8 9 9 8 7 + 1 -

3 6 7 7 7 7 9 A B B 8 A 7 6 7 A A 9 7 5 3 1 f 6 6 6 8 9 A A A 9 6 If If 7 9 9 8 6 3

3 It 6 8 9 9 9 9 8 7 5 3 + 7 8 8 6 2 3 6 8 8 8 6 5 3 3 2 + 6 6 It

-50 ~ 1 It 6 7 T It 2 2 2 2 2 3 + 1 -2 + 5 2 I 1 I I 3 3 2

I I 2 3 1 2 1 I 3 3 2 1

-75 Ishy

2 2 I I -I

I I I I I I

-100 -75 -50 -25 o 25 50 75 100 bull

x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

I I lr- I I I I

l-4-204771_ 45 I- r- shy

r shy

~ ~ - CENTER POINT 020 nmi ~r-40 - shy-

shy-r-shy

rshy35 - r- shy

r- _rshy -~ ~ 30 ~ - - shyoCt

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rshy25 r- shy

0 ~

0 r- shyr-W

m 20 shyE - - shygt z

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I shy

10 - - shyI shy

-rshy-r shy

05 - - shy

- ~

rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

3 pound+ It 6 8 8 8 1 e 5 3 1 5 1 1 8 8 6 pound+

2 3 pound+ 5 7 8 8 8 1 6 5 5 5 6 6 6 6 8 I 8 6 2 50 ~ 2 3 5 8 lt) lt) lt) 8 6 2 3 5 7 7 6 6 7 8 lt) lt) 8 5 3 -

2 3 5 8 lt) A lt) 7 6 pound+ 1 8 8 1 5 7 8 8 lt) lt) 1 6 3 ~ 3 5 6 7 7 lt) lt) A A 7 5 3 1 6 8 lt) 7 5 3 5 8 lt) lt) lt) 7 3

1 pound+ 6 1 8 S lt) A lt) A 7 5 pound+ 1 3 lt) lt) 8 3 3 3 5 8 9 9 9 6 5 2 3 6 8 9 lt) lt) lt) lt) 8 lt) 8 lt) 8 6 1 A A lt) 6 7 1 8 9 lt) lt) 7 5 pound+ 2 1

0 0

25 ~ pound+

pound+

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8 7

8 8

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lt)

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lt)

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8 lt) A A A 8 A A B 8 A 8

6 5

If

1 2 3

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5

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2 5 6 6 1 2 5 6 7 8 8 8 1 6 5 6 8 8 1 1 5 It 3 1 1 5 6 6 6 6 6 6 6 5 If 1 1 8 6 5 3 1

3 6 1 1 6 5 2 2 pound+ If If 5 1 1 6 It 2 1 1 5 7 1 6 6 3 2 If 5 6 6 It

-50 - 1 pound+ 6 1 5 3 1 1 3 If If If 3 -3 If 5 1 2 2 2 If If 3

1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

~ u lt 0 U 0 lt

u 0 0 W (II

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30

25

20

15

-

-

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-rshy

10 -

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rh 90 100

RANGE (nmi)

FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

s shy~

00 2

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-

2 2 3 5 5 2

6 5 6 1 3 6 6 1 1 1 5 1 8 If 2 1 1 1 8 9 8 6 6 8 8 If 2 2

1 3 9 9 A 1 7 1 1 1 - 3 3 2 If 5 6 8 8 8 9 8 6 2 If If 3 2

q t II) 6 8 8 9 f T 5 t Cgt 3 1 ~ 1 If 5 T 9 A e a 8 8 6 It 3 5 5 5 5 1 9 8 C C 8 9 8 6

1 3 ~ 5 6 f 6 A C 0 E E A 8 5 1

1 5 7 1 8 ( 9 8 o E F F C 8 2 2 1 ~

ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

1 If 5 8 8 816 8 7 5 3 3 5 6 1 716 1 1 6 3

1 3 1 1 8 IJ 8 1 5 If 1 1 5 8 8 8 6 5 2 1

3 0 7 16 If 3 i If b If

1 1

-

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-50

I

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25

I

50

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75 100

bull x (nmi East Mag)

bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

- r- I r r I I I 1 I

l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

35 ~ -

r-

t 30 laquo 0 U g laquo 25 u 0

0 W CD 20 ~ gt z

15

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~

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10 - -shy

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05

- shy - -

~

~l I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

--

CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

a w OJ ~ gt z

-

-

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25

20

15

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-shyrshy

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-I

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- ~

-

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o 10 20 30

RANGE

40 50

Il (nmil

60

I

70 I

80

I

90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

1 It 5 6 6 7 7 9 A 0 0 2 It 5 6 7 7 7 7 9 A A

2 It 5 II 6 6 5 It 7 8 7 2 It 5 It 3 3 If 3 If If 3 I 2 3 2 2 3 2 1 I I 2 3 2 1 I

1 1

2 3 ~

It 5 6 5 6 6 6 t 5 6 5 5 It 3 7 J

If

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2 3 ~

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-

-

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-75 Ishy -

bull bull

-100 I

-75 I I I

-50 -25 0 25

X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

0 15 ~ - shyw CD E shygt z

-~

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~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

ATe-80 (8)

MEASUREMENT TMF 4039 MON 24 MAY 1976 1114-1134 EDT

- E

J a 0 z

40

20

0

1

1

1

I

s t

J 1 ( J r 1 ~

- -- L 1 Sshy f 4 6 pound J ( f c~~j

I ~ i f

~ ~l l C D I bull A C- 1gt

7 ~

~ 4 45 bull bull ~ ~ 1 1 amp

3 1 I

t 7 s f 1 r 1 f 9

c ~c

bull ~

bull t

8

4shy

3

4shy

J

7

1

z

I

1

~

t

Z 1

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gtshy-20

I t r ( ( ~ sshy f

( ~ S ~

-40 i S

-40 -20 a 20 40 60

X(NMI EAST MAG) KEY -

SYMBOL

123456189ABCDEFGHlJKLMNOPQRST i 11111111 IIIILi iii iii

0001 001 01 1

TRAFFIC DENSITY p (AIRCRAFTINMl2)

Fig8 Traffic density map Washington DC

11

ATe-80 (9)

MEASUREMENT TMF 5026 THURS 24 JUNE 1976 1358-1428 EDTshy

r 7 t bull or r I 7 1 9 q

40

1 z20 3

r r r o

r r r r

Z~

4

3 4

4

-gt -20 ~

r I I

I

7 J 11 I I shy __ - I I

1tN6E ur _ I P~UNIamp--71IIS ~s_ 1

-60 -4Q -20 o 20 40 60

X(NMI EASTMAGJ

KEY shySYMBOL

1234 56789ABCOE FGH IJ KLMNOPQRST 11111111 IIIILI ~I iii bull ~I

0001 001 01 1

TRAFFIC DENSITYp CAIRCRAFTNMI2)

Fig9 Traffic density map Philadelphia

12

ATe-so (10)

MEASUREMENT TMF 3037 MON 29 MARCH1976 1541-1559 EST

I bull

- ~

lt ~

I t-a 0 Z

i z-gtshy

40

20

O

-20

-40

1 r 7

f r 7

~ -f r r 6 I

1 -f 1 ~ 7 if 1

~ ~ ~ 1 ( 1 t

I I 7 7 -A A

I -shy

1 1 8 e 1)

I

1 7 I~

~ bull UJHtN

I IVTAlIshy I

1 7 7 1 ~ 1 p Il shy--------shy7 7 If ~ to ~ ( bull ~--I

11 f7 1 A (

1 ~ A 1 bull 1---

r

f

1

if

bull 6shy

V

l bull Z 1

r z

I z

I

~~c~AFr I yM L I

J I I

I I

z 4 llfmiddot

J l~~

~Ifv1~

-40 -20 0 20 40

XCNMI EAST MAGJ

KEY -SYMBOL

12345678 9ABCDE FGH I J K LMNOPQRS T I I I I I I I I I I I I I l-I i i i V

0001 001 01 1

TRAFFIC DENSITYp (AlRCRAFTNMl2 )

FigIO Traffic density map Boston

13

1000

l18-4-19158 L LA HIGH DENSITY

TRAFFIC MODEL LA

0

W () Z ~ 0

Z I 100 t shy

~

t shy~

~ 0 U Q

ltt ~

o Q W m ~ 10 Z

w () ~ Q W

~

1 _---_--1_6---1-- shy

201052

RANGE R (nmi)

Fig11 Traffic distributions

bull J

6-----

50 100

in range

14

(

CI ~ ~

~

=E ~

IL 0 z ~ a ~

E c

gtshy

Ishy

Fig12

40

20

0

-40 TMF 4001 THURS MAY 6 1976

40

20

-20

-40

40

20

TMF 4045 FRI MAY 28 1976

-60 -40 -20

-40

-20

C42-1705

1600 EDT

40

1300 EDT

0 20 40 60

x (nmi EAST OF TMF MAG)

Day-to-day comparison of Washington traffic

15

C42-1706

40

20

O~---+---++W---------i

-20 )

TMF 5005 -40 TUES JUNE 15 1976 1000 EDT

C)

lt 4i

u i 0 ~

I a 0 z E c

~

40

20

O~---f--l~_~----------l

-20

-40

x (nml EAST OF TMF MAG)

Fig 13 Day-to-day comparison of Philadelphia traffic

16

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

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lL 20 ~ I--

shyo a -- f-_ w -00 ~ -I shy -shyJ shyZ

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1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

-1-4-20460 shy

fshy -

-50

~

cshy o Z

E c

50

o

f shy

~

I

2

I

I I

I 1 3 t 3 1 1

1 3 t 6 7 5 3 3 2 5 t 5 7 A A A 9 6 I 6

6 9 8 C 0 C A 6 3 5 7 C C E F E 0 8 9 8 C

2 7 9 C E G G G F 0 0 0 E 5 8 8 o E F G H G E E F F 7 9 Il euro --iH-6 II 6 amp--shy7 8 9 8 8 0 F G H I I I I 5 7 8 8 8 9 8 F H I J J J I 3 I I 3 2 3 C F r J J J

9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

I 5 6 5 2 3 3 2

I

I I I 2 I

I 2 3 2 I 2 2 2 t t 3 2

2 2 3 t ~ 6 r 2 2 2 3 3 5 6 D t I

6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

6 F F E [)-euro-- euro--iHt-amp---tr--6--tr-4 H G F E C C A A 9 7 6 6 6 6 I

I H l 0 8 A987t3t31 H G F C A 66132 G F E C 9 I 232 0 0 C C 8 9 7 2 ~ 5 I

9 8 C C C 8 A 8 7 7 6 t

5 8 A C C C 8 8 A 8 8 6 1

6 7 9 8 C C 8 A 9 8 6 t

1 3 5 6 7 9 8 8 B B 7 6 I

3 I 6 9 B B 9 8 5 3 3 5 7 9 9 9 6 3

1 1 I 3 6 7 6 3 1 I

I ~

-

-

-

-

- -

-100

I I

-50 I

o I I

50

I

taO

X (nmi East 1 Mag)

FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

E

c CJ

7 ~ shyI I shyU ~

ltt ~ -shyw Z I- shy

6 l- shy l shylJ I shyltt a

~ u I- shy5a ~-

4 lJ 0 I shy

shya 4 ~

W CD

~

~ - r-_

z ~ - - shy

3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

2 If 6 888 8 C C 9 6 t 3 If A C 0 o C 8 8 It 8 8 7 6 6 6 If

2 t 7 9 888 DEE C A A It 8 E F F F 0 C 8 A A A 9 7 7 6 If 2 rshy~

o Z

0

2 5 8 9 ABC 0 E F FED 0 o E 379 A ceo 0 E F G G F G F F- - - - -

If 8 9 9 Ace 0 F F H H H H H

G G G G E 0 B A A A 9 9 8 7 5 G H G F E C A B 8 A 9 8 8 6 5

- r v bull v

H G FEe C A A 9 7 656 5 5

2

E c-

2 6 8 8 A A 8 C E G H I I 3lf5776AE G H I

I I

I I

H F C 8 899 7 6 2 1 If H G C 9 776 2

If

1 3

1 2 1 8 E F G H H GEe 9 5 5 2 gt- - 25 - 3 A C C 0 F E 0 C It A 8 5 5 5 2 -

5 8 8 7 A B 888 A A 9 7 6 3 If 6 6 1 6 9 A 8 8 8 A 8 5 1 2 5 If 1 1 2 7 A 8 B 8 8 5 2

2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

~7 shy

r-

t- ~~

~ ltt a 6 ~ shyu 0 r-I shy

lti r shy

~

0 ~

5 shyr-a

~

shyw CD ~ - shygt -

4 shyz fshy -

rshy

-1--shy~ -

I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

75

I 2 2 I 3 J 2

2 + + 3 2 50 2 5 5 At J

I 3 2 I 2 + 5 5 5 2 3 At At At 3 + 5 Igt 5 + 1 1

I 3 5 6 6 7 Igt 8 5 5 3 I 2 3 2 1 2 3 At 6 8 8 8 1 2 Igt 8 8 l 2 I I + J I

25 I 2 2 5 A B A 1 Igt 1 7 1 5 5 6 Igt 5 3 1 2 3 3 1 CO D I I I At 8 A C C 8 8 + 3 I A 8 8 8 A 8 1 5 5 Igt 8 7 7 5 2 2 2 3 6 9 B C E E 0 C 9 8 A 0 0 0 0 8 A 1 Igt 1 1 8 8 7 5 2 ~ 2 At It 6 8 A C E F F F E 0 C C E F E 0 A 9 Igt Igt 7 7 7 7 5 1 ~ 0 Z

a 2 It

It

5

6

6

7

8

8

8

9

B C E F H I H GEE -++-t-j-fmiddot-~ oF-

A B C F H r J I H G

F FEe 8 9-9- f Dell a 8 9

8

II

7

9

1

8

7

8

6

6

5

5

It

It

I

e c gt- -25

I It Igt It

7 8 Igt 7 It 5

3

9 A A D G I I r I 4

7 8 9 9 0 G H H 11

66669CE G 2 + At + 7 9 A A C 0

G E C 1 G E f A

E 0 9F

E DCA

Il 1 II 9

9 I

J

8

I

Igt

9

5

I

~

Igt 1 )

8 6 J It

7 7 5

5

Igt tl

5 5

5 5 + 3

3 3 2 2

I 3 + 5 1 9 9 9 8 A II A A II A 9 7 5 5 5 + I I I 3 + 5 7 8 8 9 8 r 889 A A ~ 8 8 7 5 1

2 3 3 + 6 Igt Igt 7 8 9 8 5 2 l 1 9 A A 9 7 5 I

2 3 3 57768A4 A I J 5 9 A 8 1 5

-50 2 3 I

3 5 2

Igt 5 1

7 Igt

7 5 5

7 1

Igt

9 9

8

A 4

9

A

B

Igt 9

8

1

8

5

1 J 5

J J b

If

6 b

(I A II

7 9

A II

9

9 7

9 7 t

6 1

I + 5 5 Igt 7 II 8 7 7 b b 7 Igt It

I J J I b b i) b b b 5 J -75 1 3 + 5 I 1

I I 2

~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

-

7 CENTERPOINT -20 nmi -5 nmi -

6 - -rshylL

r shy _

lt -0 U 0 5 - -lt

lL _ r-

o -0 W 4 - -CD ~ ~ r-

z -

shy--

2 fshy -- -

rshy -

1-shyI--~-

-

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

Ishy

~-

t -75

-50

25

gt- -25

r-o 0 z

E c

1

1 1 2

A bull amp

1

2 2 2 1 If

2

2 2 2 2 4f

If bull

2

1

3 2 4f

5 1 V

4f

3

1 2 2 5 5 1 8 A V

6 If 2

1 2 1 1 3 3 2 2 1 7 3 2 2 2 2 5 6 6 5 3 1 6 7 7 3 2 3 2 2 1 6 8 9 9 8 4f 1 6 6 7 3 5 4f 4f 4f 1 1 7 9 B B A 8 poundf 2 3 At 9 7 8 8 8 6 6 At 4f 5 6 7 8 A C 0 C B 9 8 A A C 0 C 8 B 9 8 1 1 1 1 8 9 B C 0 0 0 0 C C 0 E E E o D B A 9 8 1 1 1 9 A C E F F E 0 E E F F E E 0 C 8 A 8 1 6 6 A - - shy - r _ A

V V V V

1 8 B E F G G G G G o C C B B 8 A 9 1 5 3 3 5 6 8 C F G G H H H G F 0 C 8 8 A 9 1 At 2 1 3 If 5 9 0 F G H H I H G F C C 8 9 8 6 3 2 L 3 6 A C E F Ii H H G E C 8 A 9 1 6 3

2 2 It 7 9 8 C 0 E F F 0 C B A 9 9 7 6 1 2 3 If 6 7 7 8 9 C C B A A B A A 8 7 5

1 2 If 5 6 6 7 7 8 8 9 9 A A 8 8 A 9 5 1 1 2 5 5 6 6 6 7 7 7 1 9 A 8 8 B 8 3

3 It If It At At If 5 5 6 8 A A A 9 3 1 2 2 2 2 1 2 3 t 6 8 A A 8 t

2 t 6 9 8 A 8 5 1 I 3 3 3 8 9 9 A 7 At

I 1 3 It t 1 1 8 8 3 1 2 3 If 2 1 5 6

I 1 1

7 8 7 7

3

5 6 6

5

2

3 At

4f 3 ~

1

1 1

-

-

-

-

I I I J I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-7 LA map TMF8055

A-9

- -

8 I I r- r J I I I

--4-20467 L ~7 shy

I shy

I- CENTERPOINT -5 nmi -15 nmi _6 ~

f shy

~shy 5 shy

IJ I- shyltX ~

n u I shyn

I shyltX r- r shy

~ ~- shyIJ o

l- f shy0 W CD ~ ~ ~ ~ z 3 - - shy

-rshy

~ f-f- shy2 - shy

-f- shy

~ ~-~ -I shy

- nTh+-_ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

2 3 3 6 1 881 665 6 6 6 6 It 1 1 3 5 6 1 8 9 981 888 8 1 1 6 ~

1 1 1 3 5 8 A 8 8 988 999 9 1 5 3 1 1 3 3 1 1 3 5 6 9 8 C D 989 A A 9 8 5 2 3 3 3 2

25 - 1 3 5 5 2 2 3 6 9 C o U A 9 A A 8 9 6 If 2 3 4f It 3 -1 3 5 5 6 5 1 A C o 0 888 889 6 If It 2

5 6 5 6 A 0 f E 0 C 8 C C 8 9 6 5 5 5 3 1 ~ 2 If 5 5 1 C E F F E o C 8 8 8 9 1 5 5 3 3 2

Lshy~

o z

0 1 1 12236 8 0 F F F E shy bull v

1 1 8 A A C 0 0 o 0

E 0 8 8 A A 1 5 - ~ v v

E C C 9 8 8 If

3 3 If If 2

3 1

2

E c

1 9 A A b B B 8 8 3 1 8 J 9 A A 9 9 A

0 C B 7 6 33 3 2 1 B A 8 6 3 2 3 3 2

gt- -25 - 3 5 6 7 8 9 8 9 9 1 2 5 5 6 1 1 8 8 8

A 9 2 1 5 2 1 2

1 2 2 2 1 3 3 3 2 1 -

5 6 6 5 5 6 7 1 1 6 222 2 3 3 3 2 1 3 5 6 6 6 5 5 5 5 5 If 3 1 122 3 3 2 1 3 5 6 6 5 5 3 If If 2 1 1 2 1 1 2 5 2 1 If 3 3 2 1 122 1

-50 - 1 233 3 2 1 222 1 -223 If 2 1 1 12 3 1 t

2 3 3 1 1 2 1

-75 ~ -

I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

35 ~ shy

I-r-

rshy -~ IJ 30 ~ shylaquo -a r-u shy -a laquo ~- shyIJ 25 l- I- I- shy0 -a - lshyw CD 20 I- shygt ~

-rshyz ~

- -15 - -~ ~ shyrshy

1-shy

r- 0 shy

rshy

-- -05 shy- Ishy

-

mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

~ 1 If 5 6 6 6 9 A B 0 0 0 lt- C B 9 7 5 If

2 3 5 6 6 7 8 A C 0 0 E 0 C B B A 9 7 5 1s ~

2 If If 5 6 7 9 A C 0 E o C 8 A A A 962 ~ o _0 3 5 6 -+-6--amp--e-9--fr~- ~--i---9--8-8 ~ ~ ~ ~ ~

Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

-50 - 332 -shy2 1

-75 1 - shy

1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

~25 shy

Ishy

Ishy~~ 20 shy

0 U Ishy0

r shyltt Ishy

lL ~o I-shylshy

~ Ishyffi 5 shyf-CD

~ gt z

- 0 shy-

05 shy

Ishy

~

h I I I o

10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

~

1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

1 3

1 1 2 2 2

1 3 3 3 3 1 3 2 If If 3 3 2 6 6 6 5 If 3 2

8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

-

--

-

-75 ~

--

-

1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

~

-shyz

10 ~ shy-

05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

0 --

3 5

- shy6 5 5

6

7

7

-9

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A

n

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n

8

9

8

n

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9

-9 9

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6 6

7 6

8 8

9

8 8 8

8

9 7 8

7 8

9

9 A A

C 8 C 0

8 0

A

8 9 9

8 7

6 3

2 2

2

2

2

2

2 2 2 3 1

1 1 If 5 7 9 8 C 8 8 9 9 C C 8 A 7 3 1 1 gtshy -25 ~ 1 1 2 7 A C C C 8 A A 9 8 8 9 6 -

2 3 3 3 If 6 A C C C A A 9 9 9 9 5 2 3 If 5 5 6 9 8 8 A 8 8 8 9 7 If

2 If 6 6 6 6 7 8 8 7 5 5 7 7 5 3 2 If 6 6 6 5 If 6 6 5 6 6 7 6 If

-50 ~ If 5 6 5 2 3 5 6 8 7 7 3 -2 If If 2 5 7 8 7 6

1 3 6 T 7 6 If

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2 If 5 5 If 2

-75 - 2 3 2 1 -

I I ~J I 1 I i I I A shy

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

-- -

Ishy

-4 shy- shy

IJ shylaquo 0 I- shyu ~ 0

laquo IJ

3 - shy~ 0 f- shy-0 - l- I-- IshyIJJ shyCD - E I-lshygt shyz

2 - shy~ -f-

-fshy -

~ shy

I- shy

-

J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

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0

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l

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C 8 A A A A 8 5 5 5 5 5 5 + 3

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f

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+ 5 5 5 +

3

3 It 6 6 6 6 7 8 A amp 8 8 A A A 9 9 9 8 i 6 3 1 2 3 3 2 gt- -25 ~ 3 Ii 7 7 1 7 8 9 B B 8 B A lt1 8 8 9 9 8 7 + 1 -

3 6 7 7 7 7 9 A B B 8 A 7 6 7 A A 9 7 5 3 1 f 6 6 6 8 9 A A A 9 6 If If 7 9 9 8 6 3

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I I 2 3 1 2 1 I 3 3 2 1

-75 Ishy

2 2 I I -I

I I I I I I

-100 -75 -50 -25 o 25 50 75 100 bull

x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

I I lr- I I I I

l-4-204771_ 45 I- r- shy

r shy

~ ~ - CENTER POINT 020 nmi ~r-40 - shy-

shy-r-shy

rshy35 - r- shy

r- _rshy -~ ~ 30 ~ - - shyoCt

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m 20 shyE - - shygt z

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I shy

10 - - shyI shy

-rshy-r shy

05 - - shy

- ~

rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

3 pound+ It 6 8 8 8 1 e 5 3 1 5 1 1 8 8 6 pound+

2 3 pound+ 5 7 8 8 8 1 6 5 5 5 6 6 6 6 8 I 8 6 2 50 ~ 2 3 5 8 lt) lt) lt) 8 6 2 3 5 7 7 6 6 7 8 lt) lt) 8 5 3 -

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1 pound+ 6 1 8 S lt) A lt) A 7 5 pound+ 1 3 lt) lt) 8 3 3 3 5 8 9 9 9 6 5 2 3 6 8 9 lt) lt) lt) lt) 8 lt) 8 lt) 8 6 1 A A lt) 6 7 1 8 9 lt) lt) 7 5 pound+ 2 1

0 0

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2 5 6 6 1 2 5 6 7 8 8 8 1 6 5 6 8 8 1 1 5 It 3 1 1 5 6 6 6 6 6 6 6 5 If 1 1 8 6 5 3 1

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1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

~ u lt 0 U 0 lt

u 0 0 W (II

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25

20

15

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o 10 20 30 40 50 60 70 80

rh 90 100

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FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

s shy~

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q t II) 6 8 8 9 f T 5 t Cgt 3 1 ~ 1 If 5 T 9 A e a 8 8 6 It 3 5 5 5 5 1 9 8 C C 8 9 8 6

1 3 ~ 5 6 f 6 A C 0 E E A 8 5 1

1 5 7 1 8 ( 9 8 o E F F C 8 2 2 1 ~

ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

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-25 o I

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50

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75 100

bull x (nmi East Mag)

bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

- r- I r r I I I 1 I

l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

35 ~ -

r-

t 30 laquo 0 U g laquo 25 u 0

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15

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10 - -shy

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~

~l I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

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-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

--

CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

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RANGE

40 50

Il (nmil

60

I

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80

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FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

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2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

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2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

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V w w ~ ~

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bull bull

-100 I

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X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

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--

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l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

0 15 ~ - shyw CD E shygt z

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~-~

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I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

ATe-80 (9)

MEASUREMENT TMF 5026 THURS 24 JUNE 1976 1358-1428 EDTshy

r 7 t bull or r I 7 1 9 q

40

1 z20 3

r r r o

r r r r

Z~

4

3 4

4

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-60 -4Q -20 o 20 40 60

X(NMI EASTMAGJ

KEY shySYMBOL

1234 56789ABCOE FGH IJ KLMNOPQRST 11111111 IIIILI ~I iii bull ~I

0001 001 01 1

TRAFFIC DENSITYp CAIRCRAFTNMI2)

Fig9 Traffic density map Philadelphia

12

ATe-so (10)

MEASUREMENT TMF 3037 MON 29 MARCH1976 1541-1559 EST

I bull

- ~

lt ~

I t-a 0 Z

i z-gtshy

40

20

O

-20

-40

1 r 7

f r 7

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1 -f 1 ~ 7 if 1

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I IVTAlIshy I

1 7 7 1 ~ 1 p Il shy--------shy7 7 If ~ to ~ ( bull ~--I

11 f7 1 A (

1 ~ A 1 bull 1---

r

f

1

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V

l bull Z 1

r z

I z

I

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J I I

I I

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J l~~

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-40 -20 0 20 40

XCNMI EAST MAGJ

KEY -SYMBOL

12345678 9ABCDE FGH I J K LMNOPQRS T I I I I I I I I I I I I I l-I i i i V

0001 001 01 1

TRAFFIC DENSITYp (AlRCRAFTNMl2 )

FigIO Traffic density map Boston

13

1000

l18-4-19158 L LA HIGH DENSITY

TRAFFIC MODEL LA

0

W () Z ~ 0

Z I 100 t shy

~

t shy~

~ 0 U Q

ltt ~

o Q W m ~ 10 Z

w () ~ Q W

~

1 _---_--1_6---1-- shy

201052

RANGE R (nmi)

Fig11 Traffic distributions

bull J

6-----

50 100

in range

14

(

CI ~ ~

~

=E ~

IL 0 z ~ a ~

E c

gtshy

Ishy

Fig12

40

20

0

-40 TMF 4001 THURS MAY 6 1976

40

20

-20

-40

40

20

TMF 4045 FRI MAY 28 1976

-60 -40 -20

-40

-20

C42-1705

1600 EDT

40

1300 EDT

0 20 40 60

x (nmi EAST OF TMF MAG)

Day-to-day comparison of Washington traffic

15

C42-1706

40

20

O~---+---++W---------i

-20 )

TMF 5005 -40 TUES JUNE 15 1976 1000 EDT

C)

lt 4i

u i 0 ~

I a 0 z E c

~

40

20

O~---f--l~_~----------l

-20

-40

x (nml EAST OF TMF MAG)

Fig 13 Day-to-day comparison of Philadelphia traffic

16

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

-~Z 30 I- shyf shy

-~ lL ltX f- - shya U a lti I- shy

lL 20 ~ I--

shyo a -- f-_ w -00 ~ -I shy -shyJ shyZ

I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

-1-4-20460 shy

fshy -

-50

~

cshy o Z

E c

50

o

f shy

~

I

2

I

I I

I 1 3 t 3 1 1

1 3 t 6 7 5 3 3 2 5 t 5 7 A A A 9 6 I 6

6 9 8 C 0 C A 6 3 5 7 C C E F E 0 8 9 8 C

2 7 9 C E G G G F 0 0 0 E 5 8 8 o E F G H G E E F F 7 9 Il euro --iH-6 II 6 amp--shy7 8 9 8 8 0 F G H I I I I 5 7 8 8 8 9 8 F H I J J J I 3 I I 3 2 3 C F r J J J

9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

I 5 6 5 2 3 3 2

I

I I I 2 I

I 2 3 2 I 2 2 2 t t 3 2

2 2 3 t ~ 6 r 2 2 2 3 3 5 6 D t I

6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

6 F F E [)-euro-- euro--iHt-amp---tr--6--tr-4 H G F E C C A A 9 7 6 6 6 6 I

I H l 0 8 A987t3t31 H G F C A 66132 G F E C 9 I 232 0 0 C C 8 9 7 2 ~ 5 I

9 8 C C C 8 A 8 7 7 6 t

5 8 A C C C 8 8 A 8 8 6 1

6 7 9 8 C C 8 A 9 8 6 t

1 3 5 6 7 9 8 8 B B 7 6 I

3 I 6 9 B B 9 8 5 3 3 5 7 9 9 9 6 3

1 1 I 3 6 7 6 3 1 I

I ~

-

-

-

-

- -

-100

I I

-50 I

o I I

50

I

taO

X (nmi East 1 Mag)

FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

E

c CJ

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W CD

~

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z ~ - - shy

3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

2 If 6 888 8 C C 9 6 t 3 If A C 0 o C 8 8 It 8 8 7 6 6 6 If

2 t 7 9 888 DEE C A A It 8 E F F F 0 C 8 A A A 9 7 7 6 If 2 rshy~

o Z

0

2 5 8 9 ABC 0 E F FED 0 o E 379 A ceo 0 E F G G F G F F- - - - -

If 8 9 9 Ace 0 F F H H H H H

G G G G E 0 B A A A 9 9 8 7 5 G H G F E C A B 8 A 9 8 8 6 5

- r v bull v

H G FEe C A A 9 7 656 5 5

2

E c-

2 6 8 8 A A 8 C E G H I I 3lf5776AE G H I

I I

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1 2 1 8 E F G H H GEe 9 5 5 2 gt- - 25 - 3 A C C 0 F E 0 C It A 8 5 5 5 2 -

5 8 8 7 A B 888 A A 9 7 6 3 If 6 6 1 6 9 A 8 8 8 A 8 5 1 2 5 If 1 1 2 7 A 8 B 8 8 5 2

2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

~7 shy

r-

t- ~~

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lti r shy

~

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shyw CD ~ - shygt -

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rshy

-1--shy~ -

I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

75

I 2 2 I 3 J 2

2 + + 3 2 50 2 5 5 At J

I 3 2 I 2 + 5 5 5 2 3 At At At 3 + 5 Igt 5 + 1 1

I 3 5 6 6 7 Igt 8 5 5 3 I 2 3 2 1 2 3 At 6 8 8 8 1 2 Igt 8 8 l 2 I I + J I

25 I 2 2 5 A B A 1 Igt 1 7 1 5 5 6 Igt 5 3 1 2 3 3 1 CO D I I I At 8 A C C 8 8 + 3 I A 8 8 8 A 8 1 5 5 Igt 8 7 7 5 2 2 2 3 6 9 B C E E 0 C 9 8 A 0 0 0 0 8 A 1 Igt 1 1 8 8 7 5 2 ~ 2 At It 6 8 A C E F F F E 0 C C E F E 0 A 9 Igt Igt 7 7 7 7 5 1 ~ 0 Z

a 2 It

It

5

6

6

7

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B C E F H I H GEE -++-t-j-fmiddot-~ oF-

A B C F H r J I H G

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6

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9 A A D G I I r I 4

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I 3 + 5 1 9 9 9 8 A II A A II A 9 7 5 5 5 + I I I 3 + 5 7 8 8 9 8 r 889 A A ~ 8 8 7 5 1

2 3 3 + 6 Igt Igt 7 8 9 8 5 2 l 1 9 A A 9 7 5 I

2 3 3 57768A4 A I J 5 9 A 8 1 5

-50 2 3 I

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(I A II

7 9

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9

9 7

9 7 t

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I J J I b b i) b b b 5 J -75 1 3 + 5 I 1

I I 2

~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

-

7 CENTERPOINT -20 nmi -5 nmi -

6 - -rshylL

r shy _

lt -0 U 0 5 - -lt

lL _ r-

o -0 W 4 - -CD ~ ~ r-

z -

shy--

2 fshy -- -

rshy -

1-shyI--~-

-

o 10 20 30 40 50 60 70 80 90 100

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FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

Ishy

~-

t -75

-50

25

gt- -25

r-o 0 z

E c

1

1 1 2

A bull amp

1

2 2 2 1 If

2

2 2 2 2 4f

If bull

2

1

3 2 4f

5 1 V

4f

3

1 2 2 5 5 1 8 A V

6 If 2

1 2 1 1 3 3 2 2 1 7 3 2 2 2 2 5 6 6 5 3 1 6 7 7 3 2 3 2 2 1 6 8 9 9 8 4f 1 6 6 7 3 5 4f 4f 4f 1 1 7 9 B B A 8 poundf 2 3 At 9 7 8 8 8 6 6 At 4f 5 6 7 8 A C 0 C B 9 8 A A C 0 C 8 B 9 8 1 1 1 1 8 9 B C 0 0 0 0 C C 0 E E E o D B A 9 8 1 1 1 9 A C E F F E 0 E E F F E E 0 C 8 A 8 1 6 6 A - - shy - r _ A

V V V V

1 8 B E F G G G G G o C C B B 8 A 9 1 5 3 3 5 6 8 C F G G H H H G F 0 C 8 8 A 9 1 At 2 1 3 If 5 9 0 F G H H I H G F C C 8 9 8 6 3 2 L 3 6 A C E F Ii H H G E C 8 A 9 1 6 3

2 2 It 7 9 8 C 0 E F F 0 C B A 9 9 7 6 1 2 3 If 6 7 7 8 9 C C B A A B A A 8 7 5

1 2 If 5 6 6 7 7 8 8 9 9 A A 8 8 A 9 5 1 1 2 5 5 6 6 6 7 7 7 1 9 A 8 8 B 8 3

3 It If It At At If 5 5 6 8 A A A 9 3 1 2 2 2 2 1 2 3 t 6 8 A A 8 t

2 t 6 9 8 A 8 5 1 I 3 3 3 8 9 9 A 7 At

I 1 3 It t 1 1 8 8 3 1 2 3 If 2 1 5 6

I 1 1

7 8 7 7

3

5 6 6

5

2

3 At

4f 3 ~

1

1 1

-

-

-

-

I I I J I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-7 LA map TMF8055

A-9

- -

8 I I r- r J I I I

--4-20467 L ~7 shy

I shy

I- CENTERPOINT -5 nmi -15 nmi _6 ~

f shy

~shy 5 shy

IJ I- shyltX ~

n u I shyn

I shyltX r- r shy

~ ~- shyIJ o

l- f shy0 W CD ~ ~ ~ ~ z 3 - - shy

-rshy

~ f-f- shy2 - shy

-f- shy

~ ~-~ -I shy

- nTh+-_ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

2 3 3 6 1 881 665 6 6 6 6 It 1 1 3 5 6 1 8 9 981 888 8 1 1 6 ~

1 1 1 3 5 8 A 8 8 988 999 9 1 5 3 1 1 3 3 1 1 3 5 6 9 8 C D 989 A A 9 8 5 2 3 3 3 2

25 - 1 3 5 5 2 2 3 6 9 C o U A 9 A A 8 9 6 If 2 3 4f It 3 -1 3 5 5 6 5 1 A C o 0 888 889 6 If It 2

5 6 5 6 A 0 f E 0 C 8 C C 8 9 6 5 5 5 3 1 ~ 2 If 5 5 1 C E F F E o C 8 8 8 9 1 5 5 3 3 2

Lshy~

o z

0 1 1 12236 8 0 F F F E shy bull v

1 1 8 A A C 0 0 o 0

E 0 8 8 A A 1 5 - ~ v v

E C C 9 8 8 If

3 3 If If 2

3 1

2

E c

1 9 A A b B B 8 8 3 1 8 J 9 A A 9 9 A

0 C B 7 6 33 3 2 1 B A 8 6 3 2 3 3 2

gt- -25 - 3 5 6 7 8 9 8 9 9 1 2 5 5 6 1 1 8 8 8

A 9 2 1 5 2 1 2

1 2 2 2 1 3 3 3 2 1 -

5 6 6 5 5 6 7 1 1 6 222 2 3 3 3 2 1 3 5 6 6 6 5 5 5 5 5 If 3 1 122 3 3 2 1 3 5 6 6 5 5 3 If If 2 1 1 2 1 1 2 5 2 1 If 3 3 2 1 122 1

-50 - 1 233 3 2 1 222 1 -223 If 2 1 1 12 3 1 t

2 3 3 1 1 2 1

-75 ~ -

I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

35 ~ shy

I-r-

rshy -~ IJ 30 ~ shylaquo -a r-u shy -a laquo ~- shyIJ 25 l- I- I- shy0 -a - lshyw CD 20 I- shygt ~

-rshyz ~

- -15 - -~ ~ shyrshy

1-shy

r- 0 shy

rshy

-- -05 shy- Ishy

-

mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

~ 1 If 5 6 6 6 9 A B 0 0 0 lt- C B 9 7 5 If

2 3 5 6 6 7 8 A C 0 0 E 0 C B B A 9 7 5 1s ~

2 If If 5 6 7 9 A C 0 E o C 8 A A A 962 ~ o _0 3 5 6 -+-6--amp--e-9--fr~- ~--i---9--8-8 ~ ~ ~ ~ ~

Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

-50 - 332 -shy2 1

-75 1 - shy

1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

~25 shy

Ishy

Ishy~~ 20 shy

0 U Ishy0

r shyltt Ishy

lL ~o I-shylshy

~ Ishyffi 5 shyf-CD

~ gt z

- 0 shy-

05 shy

Ishy

~

h I I I o

10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

~

1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

1 3

1 1 2 2 2

1 3 3 3 3 1 3 2 If If 3 3 2 6 6 6 5 If 3 2

8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

-

--

-

-75 ~

--

-

1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

~

-shyz

10 ~ shy-

05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

0 --

3 5

- shy6 5 5

6

7

7

-9

A

A

n

A 8

n

8

9

8

n

C A

9

-9 9

-

9

-

8

-

1 2

3 3

v

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If

_

3

ft

shy

1

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5 3

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6 3

6 6

7 6

8 8

9

8 8 8

8

9 7 8

7 8

9

9 A A

C 8 C 0

8 0

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8 9 9

8 7

6 3

2 2

2

2

2

2

2 2 2 3 1

1 1 If 5 7 9 8 C 8 8 9 9 C C 8 A 7 3 1 1 gtshy -25 ~ 1 1 2 7 A C C C 8 A A 9 8 8 9 6 -

2 3 3 3 If 6 A C C C A A 9 9 9 9 5 2 3 If 5 5 6 9 8 8 A 8 8 8 9 7 If

2 If 6 6 6 6 7 8 8 7 5 5 7 7 5 3 2 If 6 6 6 5 If 6 6 5 6 6 7 6 If

-50 ~ If 5 6 5 2 3 5 6 8 7 7 3 -2 If If 2 5 7 8 7 6

1 3 6 T 7 6 If

1 3 If 6 6 6 If

2 If 5 5 If 2

-75 - 2 3 2 1 -

I I ~J I 1 I i I I A shy

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

-- -

Ishy

-4 shy- shy

IJ shylaquo 0 I- shyu ~ 0

laquo IJ

3 - shy~ 0 f- shy-0 - l- I-- IshyIJJ shyCD - E I-lshygt shyz

2 - shy~ -f-

-fshy -

~ shy

I- shy

-

J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

Lshy ~

o Z

0

3 2 ~ 1

5 f ~ 2

5 5

l

6 5

1

6 6

1

6 5 ~

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6 5 ~

3

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6 8

9 9 ~

9

A 8 A 8

A

U

A 9

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8 8 C

C C 8 9 A 9 8 T 5 5 5 f It 3 1 eBB B B A 9 7 5 5 5 5 5 5 3 A A A A bull - shy - - shy - ~ u U _JJJoJamp

C 8 A A A A 8 5 5 5 5 5 5 + 3

E c-

1 2

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1 f

2

+ 2

5

f

6 6 7 8 7 7 8

9 9 A A A 8

B A A A

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9

8 9 7

8 6 5 7 5 If

It 1 3

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+ 5 5 5 +

3

3 It 6 6 6 6 7 8 A amp 8 8 A A A 9 9 9 8 i 6 3 1 2 3 3 2 gt- -25 ~ 3 Ii 7 7 1 7 8 9 B B 8 B A lt1 8 8 9 9 8 7 + 1 -

3 6 7 7 7 7 9 A B B 8 A 7 6 7 A A 9 7 5 3 1 f 6 6 6 8 9 A A A 9 6 If If 7 9 9 8 6 3

3 It 6 8 9 9 9 9 8 7 5 3 + 7 8 8 6 2 3 6 8 8 8 6 5 3 3 2 + 6 6 It

-50 ~ 1 It 6 7 T It 2 2 2 2 2 3 + 1 -2 + 5 2 I 1 I I 3 3 2

I I 2 3 1 2 1 I 3 3 2 1

-75 Ishy

2 2 I I -I

I I I I I I

-100 -75 -50 -25 o 25 50 75 100 bull

x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

I I lr- I I I I

l-4-204771_ 45 I- r- shy

r shy

~ ~ - CENTER POINT 020 nmi ~r-40 - shy-

shy-r-shy

rshy35 - r- shy

r- _rshy -~ ~ 30 ~ - - shyoCt

Ir shy ~ 0 U 0 oCt

rshy25 r- shy

0 ~

0 r- shyr-W

m 20 shyE - - shygt z

- r-- shy15 r- shy-

I shy

10 - - shyI shy

-rshy-r shy

05 - - shy

- ~

rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

3 pound+ It 6 8 8 8 1 e 5 3 1 5 1 1 8 8 6 pound+

2 3 pound+ 5 7 8 8 8 1 6 5 5 5 6 6 6 6 8 I 8 6 2 50 ~ 2 3 5 8 lt) lt) lt) 8 6 2 3 5 7 7 6 6 7 8 lt) lt) 8 5 3 -

2 3 5 8 lt) A lt) 7 6 pound+ 1 8 8 1 5 7 8 8 lt) lt) 1 6 3 ~ 3 5 6 7 7 lt) lt) A A 7 5 3 1 6 8 lt) 7 5 3 5 8 lt) lt) lt) 7 3

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0 0

25 ~ pound+

pound+

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8 7

8 8

9 8

lt)

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6 5

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6 5 3

5 2 3

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1

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2 5 6 6 1 2 5 6 7 8 8 8 1 6 5 6 8 8 1 1 5 It 3 1 1 5 6 6 6 6 6 6 6 5 If 1 1 8 6 5 3 1

3 6 1 1 6 5 2 2 pound+ If If 5 1 1 6 It 2 1 1 5 7 1 6 6 3 2 If 5 6 6 It

-50 - 1 pound+ 6 1 5 3 1 1 3 If If If 3 -3 If 5 1 2 2 2 If If 3

1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

~ u lt 0 U 0 lt

u 0 0 W (II

~ ~ Z

30

25

20

15

-

-

-

-

-rshy

10 -

05 -

o 10 20 30 40 50 60 70 80

rh 90 100

RANGE (nmi)

FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

s shy~

00 2

E c-gt -25

-50

f r

-

2 2 3 5 5 2

6 5 6 1 3 6 6 1 1 1 5 1 8 If 2 1 1 1 8 9 8 6 6 8 8 If 2 2

1 3 9 9 A 1 7 1 1 1 - 3 3 2 If 5 6 8 8 8 9 8 6 2 If If 3 2

q t II) 6 8 8 9 f T 5 t Cgt 3 1 ~ 1 If 5 T 9 A e a 8 8 6 It 3 5 5 5 5 1 9 8 C C 8 9 8 6

1 3 ~ 5 6 f 6 A C 0 E E A 8 5 1

1 5 7 1 8 ( 9 8 o E F F C 8 2 2 1 ~

ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

1 If 5 8 8 816 8 7 5 3 3 5 6 1 716 1 1 6 3

1 3 1 1 8 IJ 8 1 5 If 1 1 5 8 8 8 6 5 2 1

3 0 7 16 If 3 i If b If

1 1

-

-

-

-

-

-75 - -

-100 I I

-75 I I

-50

I

-25 o I

25

I

50

I

75 100

bull x (nmi East Mag)

bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

- r- I r r I I I 1 I

l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

35 ~ -

r-

t 30 laquo 0 U g laquo 25 u 0

0 W CD 20 ~ gt z

15

~ ~ -

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~-- -_rshy - ~

-- ~ ~

~

~ --

10 - -shy

~ -

05

- shy - -

~

~l I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

--

CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

a w OJ ~ gt z

-

-

~

25

20

15

- -

-- -shy -

-shyrshy

~

~

I shy -shy -

-I

-

-

shy

~ ~10

~

- ~

-

~ -05 -

o 10 20 30

RANGE

40 50

Il (nmil

60

I

70 I

80

I

90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

1 It 5 6 6 7 7 9 A 0 0 2 It 5 6 7 7 7 7 9 A A

2 It 5 II 6 6 5 It 7 8 7 2 It 5 It 3 3 If 3 If If 3 I 2 3 2 2 3 2 1 I I 2 3 2 1 I

1 1

2 3 ~

It 5 6 5 6 6 6 t 5 6 5 5 It 3 7 J

If

7 3 8 3 - A

It 5 5 5 3 I

2 3 ~

2

-

-

-

-50 Ishy -

-75 Ishy -

bull bull

-100 I

-75 I I I

-50 -25 0 25

X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

0 15 ~ - shyw CD E shygt z

-~

~ -r shy10 shy-- - r-

~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

ATe-so (10)

MEASUREMENT TMF 3037 MON 29 MARCH1976 1541-1559 EST

I bull

- ~

lt ~

I t-a 0 Z

i z-gtshy

40

20

O

-20

-40

1 r 7

f r 7

~ -f r r 6 I

1 -f 1 ~ 7 if 1

~ ~ ~ 1 ( 1 t

I I 7 7 -A A

I -shy

1 1 8 e 1)

I

1 7 I~

~ bull UJHtN

I IVTAlIshy I

1 7 7 1 ~ 1 p Il shy--------shy7 7 If ~ to ~ ( bull ~--I

11 f7 1 A (

1 ~ A 1 bull 1---

r

f

1

if

bull 6shy

V

l bull Z 1

r z

I z

I

~~c~AFr I yM L I

J I I

I I

z 4 llfmiddot

J l~~

~Ifv1~

-40 -20 0 20 40

XCNMI EAST MAGJ

KEY -SYMBOL

12345678 9ABCDE FGH I J K LMNOPQRS T I I I I I I I I I I I I I l-I i i i V

0001 001 01 1

TRAFFIC DENSITYp (AlRCRAFTNMl2 )

FigIO Traffic density map Boston

13

1000

l18-4-19158 L LA HIGH DENSITY

TRAFFIC MODEL LA

0

W () Z ~ 0

Z I 100 t shy

~

t shy~

~ 0 U Q

ltt ~

o Q W m ~ 10 Z

w () ~ Q W

~

1 _---_--1_6---1-- shy

201052

RANGE R (nmi)

Fig11 Traffic distributions

bull J

6-----

50 100

in range

14

(

CI ~ ~

~

=E ~

IL 0 z ~ a ~

E c

gtshy

Ishy

Fig12

40

20

0

-40 TMF 4001 THURS MAY 6 1976

40

20

-20

-40

40

20

TMF 4045 FRI MAY 28 1976

-60 -40 -20

-40

-20

C42-1705

1600 EDT

40

1300 EDT

0 20 40 60

x (nmi EAST OF TMF MAG)

Day-to-day comparison of Washington traffic

15

C42-1706

40

20

O~---+---++W---------i

-20 )

TMF 5005 -40 TUES JUNE 15 1976 1000 EDT

C)

lt 4i

u i 0 ~

I a 0 z E c

~

40

20

O~---f--l~_~----------l

-20

-40

x (nml EAST OF TMF MAG)

Fig 13 Day-to-day comparison of Philadelphia traffic

16

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

-~Z 30 I- shyf shy

-~ lL ltX f- - shya U a lti I- shy

lL 20 ~ I--

shyo a -- f-_ w -00 ~ -I shy -shyJ shyZ

I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

-1-4-20460 shy

fshy -

-50

~

cshy o Z

E c

50

o

f shy

~

I

2

I

I I

I 1 3 t 3 1 1

1 3 t 6 7 5 3 3 2 5 t 5 7 A A A 9 6 I 6

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FigA-l LA map TMF8126

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FigA-2 LA histogram TMF8126

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FigA-3 LA map TMF8122

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FigA-5 LA map TMF8046

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FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

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FigA-7 LA map TMF8055

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FigA-8 LA histogram TMF8055

A-10

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FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

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2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

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0 Ol

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Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

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X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

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FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

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bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

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X (nmi East Mag)

FigA-I3 Washington map TMF4054

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FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

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1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

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X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

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FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

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2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

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FigA-17 Philadelphia map TMFS026

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FigA-18 Philadelphia histogram TMF5026

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100 I bull J I I J I

l-4-2047SL

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I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

~ u lt 0 U 0 lt

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25

20

15

-

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rh 90 100

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FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

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bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

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FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

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2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

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3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

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-50 ~ 3 b b It shy5 5 2 5 3

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j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

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--

CENTER POINT -5 omi 0 -

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40 50

Il (nmil

60

I

70 I

80

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FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

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V w w ~ ~

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X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

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LL 0

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-~

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~-~

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I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

1000

l18-4-19158 L LA HIGH DENSITY

TRAFFIC MODEL LA

0

W () Z ~ 0

Z I 100 t shy

~

t shy~

~ 0 U Q

ltt ~

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1 _---_--1_6---1-- shy

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Fig11 Traffic distributions

bull J

6-----

50 100

in range

14

(

CI ~ ~

~

=E ~

IL 0 z ~ a ~

E c

gtshy

Ishy

Fig12

40

20

0

-40 TMF 4001 THURS MAY 6 1976

40

20

-20

-40

40

20

TMF 4045 FRI MAY 28 1976

-60 -40 -20

-40

-20

C42-1705

1600 EDT

40

1300 EDT

0 20 40 60

x (nmi EAST OF TMF MAG)

Day-to-day comparison of Washington traffic

15

C42-1706

40

20

O~---+---++W---------i

-20 )

TMF 5005 -40 TUES JUNE 15 1976 1000 EDT

C)

lt 4i

u i 0 ~

I a 0 z E c

~

40

20

O~---f--l~_~----------l

-20

-40

x (nml EAST OF TMF MAG)

Fig 13 Day-to-day comparison of Philadelphia traffic

16

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

-~Z 30 I- shyf shy

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shyo a -- f-_ w -00 ~ -I shy -shyJ shyZ

I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

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1 1 I 3 6 7 6 3 1 I

I ~

-

-

-

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-100

I I

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o I I

50

I

taO

X (nmi East 1 Mag)

FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

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3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

2 If 6 888 8 C C 9 6 t 3 If A C 0 o C 8 8 It 8 8 7 6 6 6 If

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0

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2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

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r-

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I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

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FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

75

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FigA-5 LA map TMF8046

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FigA-6 LA histogram TMF8046

A-8

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FigA-8 LA histogram TMF8055

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FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

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0 Ol

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X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

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FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

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FigA-I3 Washington map TMF4054

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FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

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1 1 75 - 3 If If 3 3 1 -

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2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

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X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

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FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

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50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

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FigA-17 Philadelphia map TMFS026

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FigA-18 Philadelphia histogram TMF5026

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100 I bull J I I J I

l-4-2047SL

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FigA-19 Philadelphia map TMF5005

A-21

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A-22

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bullbull11 FigA-21 Boston map TMF3031

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FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

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FigA-23 Boston map TMF3037

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5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

1 It 5 6 6 7 7 9 A 0 0 2 It 5 6 7 7 7 7 9 A A

2 It 5 II 6 6 5 It 7 8 7 2 It 5 It 3 3 If 3 If If 3 I 2 3 2 2 3 2 1 I I 2 3 2 1 I

1 1

2 3 ~

It 5 6 5 6 6 6 t 5 6 5 5 It 3 7 J

If

7 3 8 3 - A

It 5 5 5 3 I

2 3 ~

2

-

-

-

-50 Ishy -

-75 Ishy -

bull bull

-100 I

-75 I I I

-50 -25 0 25

X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

0 15 ~ - shyw CD E shygt z

-~

~ -r shy10 shy-- - r-

~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

(

CI ~ ~

~

=E ~

IL 0 z ~ a ~

E c

gtshy

Ishy

Fig12

40

20

0

-40 TMF 4001 THURS MAY 6 1976

40

20

-20

-40

40

20

TMF 4045 FRI MAY 28 1976

-60 -40 -20

-40

-20

C42-1705

1600 EDT

40

1300 EDT

0 20 40 60

x (nmi EAST OF TMF MAG)

Day-to-day comparison of Washington traffic

15

C42-1706

40

20

O~---+---++W---------i

-20 )

TMF 5005 -40 TUES JUNE 15 1976 1000 EDT

C)

lt 4i

u i 0 ~

I a 0 z E c

~

40

20

O~---f--l~_~----------l

-20

-40

x (nml EAST OF TMF MAG)

Fig 13 Day-to-day comparison of Philadelphia traffic

16

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

-~Z 30 I- shyf shy

-~ lL ltX f- - shya U a lti I- shy

lL 20 ~ I--

shyo a -- f-_ w -00 ~ -I shy -shyJ shyZ

I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

-1-4-20460 shy

fshy -

-50

~

cshy o Z

E c

50

o

f shy

~

I

2

I

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I 1 3 t 3 1 1

1 3 t 6 7 5 3 3 2 5 t 5 7 A A A 9 6 I 6

6 9 8 C 0 C A 6 3 5 7 C C E F E 0 8 9 8 C

2 7 9 C E G G G F 0 0 0 E 5 8 8 o E F G H G E E F F 7 9 Il euro --iH-6 II 6 amp--shy7 8 9 8 8 0 F G H I I I I 5 7 8 8 8 9 8 F H I J J J I 3 I I 3 2 3 C F r J J J

9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

I 5 6 5 2 3 3 2

I

I I I 2 I

I 2 3 2 I 2 2 2 t t 3 2

2 2 3 t ~ 6 r 2 2 2 3 3 5 6 D t I

6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

6 F F E [)-euro-- euro--iHt-amp---tr--6--tr-4 H G F E C C A A 9 7 6 6 6 6 I

I H l 0 8 A987t3t31 H G F C A 66132 G F E C 9 I 232 0 0 C C 8 9 7 2 ~ 5 I

9 8 C C C 8 A 8 7 7 6 t

5 8 A C C C 8 8 A 8 8 6 1

6 7 9 8 C C 8 A 9 8 6 t

1 3 5 6 7 9 8 8 B B 7 6 I

3 I 6 9 B B 9 8 5 3 3 5 7 9 9 9 6 3

1 1 I 3 6 7 6 3 1 I

I ~

-

-

-

-

- -

-100

I I

-50 I

o I I

50

I

taO

X (nmi East 1 Mag)

FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

E

c CJ

7 ~ shyI I shyU ~

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W CD

~

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z ~ - - shy

3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

2 If 6 888 8 C C 9 6 t 3 If A C 0 o C 8 8 It 8 8 7 6 6 6 If

2 t 7 9 888 DEE C A A It 8 E F F F 0 C 8 A A A 9 7 7 6 If 2 rshy~

o Z

0

2 5 8 9 ABC 0 E F FED 0 o E 379 A ceo 0 E F G G F G F F- - - - -

If 8 9 9 Ace 0 F F H H H H H

G G G G E 0 B A A A 9 9 8 7 5 G H G F E C A B 8 A 9 8 8 6 5

- r v bull v

H G FEe C A A 9 7 656 5 5

2

E c-

2 6 8 8 A A 8 C E G H I I 3lf5776AE G H I

I I

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H F C 8 899 7 6 2 1 If H G C 9 776 2

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1 3

1 2 1 8 E F G H H GEe 9 5 5 2 gt- - 25 - 3 A C C 0 F E 0 C It A 8 5 5 5 2 -

5 8 8 7 A B 888 A A 9 7 6 3 If 6 6 1 6 9 A 8 8 8 A 8 5 1 2 5 If 1 1 2 7 A 8 B 8 8 5 2

2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

~7 shy

r-

t- ~~

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lti r shy

~

0 ~

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~

shyw CD ~ - shygt -

4 shyz fshy -

rshy

-1--shy~ -

I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

75

I 2 2 I 3 J 2

2 + + 3 2 50 2 5 5 At J

I 3 2 I 2 + 5 5 5 2 3 At At At 3 + 5 Igt 5 + 1 1

I 3 5 6 6 7 Igt 8 5 5 3 I 2 3 2 1 2 3 At 6 8 8 8 1 2 Igt 8 8 l 2 I I + J I

25 I 2 2 5 A B A 1 Igt 1 7 1 5 5 6 Igt 5 3 1 2 3 3 1 CO D I I I At 8 A C C 8 8 + 3 I A 8 8 8 A 8 1 5 5 Igt 8 7 7 5 2 2 2 3 6 9 B C E E 0 C 9 8 A 0 0 0 0 8 A 1 Igt 1 1 8 8 7 5 2 ~ 2 At It 6 8 A C E F F F E 0 C C E F E 0 A 9 Igt Igt 7 7 7 7 5 1 ~ 0 Z

a 2 It

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5

6

6

7

8

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8

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9

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7

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6

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9 A A D G I I r I 4

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5 5 + 3

3 3 2 2

I 3 + 5 1 9 9 9 8 A II A A II A 9 7 5 5 5 + I I I 3 + 5 7 8 8 9 8 r 889 A A ~ 8 8 7 5 1

2 3 3 + 6 Igt Igt 7 8 9 8 5 2 l 1 9 A A 9 7 5 I

2 3 3 57768A4 A I J 5 9 A 8 1 5

-50 2 3 I

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7 Igt

7 5 5

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8

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9

A

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8

1

8

5

1 J 5

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6 b

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7 9

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9

9 7

9 7 t

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I + 5 5 Igt 7 II 8 7 7 b b 7 Igt It

I J J I b b i) b b b 5 J -75 1 3 + 5 I 1

I I 2

~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

-

7 CENTERPOINT -20 nmi -5 nmi -

6 - -rshylL

r shy _

lt -0 U 0 5 - -lt

lL _ r-

o -0 W 4 - -CD ~ ~ r-

z -

shy--

2 fshy -- -

rshy -

1-shyI--~-

-

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

Ishy

~-

t -75

-50

25

gt- -25

r-o 0 z

E c

1

1 1 2

A bull amp

1

2 2 2 1 If

2

2 2 2 2 4f

If bull

2

1

3 2 4f

5 1 V

4f

3

1 2 2 5 5 1 8 A V

6 If 2

1 2 1 1 3 3 2 2 1 7 3 2 2 2 2 5 6 6 5 3 1 6 7 7 3 2 3 2 2 1 6 8 9 9 8 4f 1 6 6 7 3 5 4f 4f 4f 1 1 7 9 B B A 8 poundf 2 3 At 9 7 8 8 8 6 6 At 4f 5 6 7 8 A C 0 C B 9 8 A A C 0 C 8 B 9 8 1 1 1 1 8 9 B C 0 0 0 0 C C 0 E E E o D B A 9 8 1 1 1 9 A C E F F E 0 E E F F E E 0 C 8 A 8 1 6 6 A - - shy - r _ A

V V V V

1 8 B E F G G G G G o C C B B 8 A 9 1 5 3 3 5 6 8 C F G G H H H G F 0 C 8 8 A 9 1 At 2 1 3 If 5 9 0 F G H H I H G F C C 8 9 8 6 3 2 L 3 6 A C E F Ii H H G E C 8 A 9 1 6 3

2 2 It 7 9 8 C 0 E F F 0 C B A 9 9 7 6 1 2 3 If 6 7 7 8 9 C C B A A B A A 8 7 5

1 2 If 5 6 6 7 7 8 8 9 9 A A 8 8 A 9 5 1 1 2 5 5 6 6 6 7 7 7 1 9 A 8 8 B 8 3

3 It If It At At If 5 5 6 8 A A A 9 3 1 2 2 2 2 1 2 3 t 6 8 A A 8 t

2 t 6 9 8 A 8 5 1 I 3 3 3 8 9 9 A 7 At

I 1 3 It t 1 1 8 8 3 1 2 3 If 2 1 5 6

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7 8 7 7

3

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5

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4f 3 ~

1

1 1

-

-

-

-

I I I J I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-7 LA map TMF8055

A-9

- -

8 I I r- r J I I I

--4-20467 L ~7 shy

I shy

I- CENTERPOINT -5 nmi -15 nmi _6 ~

f shy

~shy 5 shy

IJ I- shyltX ~

n u I shyn

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l- f shy0 W CD ~ ~ ~ ~ z 3 - - shy

-rshy

~ f-f- shy2 - shy

-f- shy

~ ~-~ -I shy

- nTh+-_ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

2 3 3 6 1 881 665 6 6 6 6 It 1 1 3 5 6 1 8 9 981 888 8 1 1 6 ~

1 1 1 3 5 8 A 8 8 988 999 9 1 5 3 1 1 3 3 1 1 3 5 6 9 8 C D 989 A A 9 8 5 2 3 3 3 2

25 - 1 3 5 5 2 2 3 6 9 C o U A 9 A A 8 9 6 If 2 3 4f It 3 -1 3 5 5 6 5 1 A C o 0 888 889 6 If It 2

5 6 5 6 A 0 f E 0 C 8 C C 8 9 6 5 5 5 3 1 ~ 2 If 5 5 1 C E F F E o C 8 8 8 9 1 5 5 3 3 2

Lshy~

o z

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1 1 8 A A C 0 0 o 0

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E C C 9 8 8 If

3 3 If If 2

3 1

2

E c

1 9 A A b B B 8 8 3 1 8 J 9 A A 9 9 A

0 C B 7 6 33 3 2 1 B A 8 6 3 2 3 3 2

gt- -25 - 3 5 6 7 8 9 8 9 9 1 2 5 5 6 1 1 8 8 8

A 9 2 1 5 2 1 2

1 2 2 2 1 3 3 3 2 1 -

5 6 6 5 5 6 7 1 1 6 222 2 3 3 3 2 1 3 5 6 6 6 5 5 5 5 5 If 3 1 122 3 3 2 1 3 5 6 6 5 5 3 If If 2 1 1 2 1 1 2 5 2 1 If 3 3 2 1 122 1

-50 - 1 233 3 2 1 222 1 -223 If 2 1 1 12 3 1 t

2 3 3 1 1 2 1

-75 ~ -

I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

35 ~ shy

I-r-

rshy -~ IJ 30 ~ shylaquo -a r-u shy -a laquo ~- shyIJ 25 l- I- I- shy0 -a - lshyw CD 20 I- shygt ~

-rshyz ~

- -15 - -~ ~ shyrshy

1-shy

r- 0 shy

rshy

-- -05 shy- Ishy

-

mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

~ 1 If 5 6 6 6 9 A B 0 0 0 lt- C B 9 7 5 If

2 3 5 6 6 7 8 A C 0 0 E 0 C B B A 9 7 5 1s ~

2 If If 5 6 7 9 A C 0 E o C 8 A A A 962 ~ o _0 3 5 6 -+-6--amp--e-9--fr~- ~--i---9--8-8 ~ ~ ~ ~ ~

Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

-50 - 332 -shy2 1

-75 1 - shy

1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

~25 shy

Ishy

Ishy~~ 20 shy

0 U Ishy0

r shyltt Ishy

lL ~o I-shylshy

~ Ishyffi 5 shyf-CD

~ gt z

- 0 shy-

05 shy

Ishy

~

h I I I o

10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

~

1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

1 3

1 1 2 2 2

1 3 3 3 3 1 3 2 If If 3 3 2 6 6 6 5 If 3 2

8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

-

--

-

-75 ~

--

-

1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

~

-shyz

10 ~ shy-

05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

0 --

3 5

- shy6 5 5

6

7

7

-9

A

A

n

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n

8

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8

n

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9

-9 9

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9

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9

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8

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7 8

9

9 A A

C 8 C 0

8 0

A

8 9 9

8 7

6 3

2 2

2

2

2

2

2 2 2 3 1

1 1 If 5 7 9 8 C 8 8 9 9 C C 8 A 7 3 1 1 gtshy -25 ~ 1 1 2 7 A C C C 8 A A 9 8 8 9 6 -

2 3 3 3 If 6 A C C C A A 9 9 9 9 5 2 3 If 5 5 6 9 8 8 A 8 8 8 9 7 If

2 If 6 6 6 6 7 8 8 7 5 5 7 7 5 3 2 If 6 6 6 5 If 6 6 5 6 6 7 6 If

-50 ~ If 5 6 5 2 3 5 6 8 7 7 3 -2 If If 2 5 7 8 7 6

1 3 6 T 7 6 If

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2 If 5 5 If 2

-75 - 2 3 2 1 -

I I ~J I 1 I i I I A shy

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

-- -

Ishy

-4 shy- shy

IJ shylaquo 0 I- shyu ~ 0

laquo IJ

3 - shy~ 0 f- shy-0 - l- I-- IshyIJJ shyCD - E I-lshygt shyz

2 - shy~ -f-

-fshy -

~ shy

I- shy

-

J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

Lshy ~

o Z

0

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5 f ~ 2

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l

6 5

1

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1

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9

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U

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C 8 A A A A 8 5 5 5 5 5 5 + 3

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f

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9

8 9 7

8 6 5 7 5 If

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+ 5 5 5 +

3

3 It 6 6 6 6 7 8 A amp 8 8 A A A 9 9 9 8 i 6 3 1 2 3 3 2 gt- -25 ~ 3 Ii 7 7 1 7 8 9 B B 8 B A lt1 8 8 9 9 8 7 + 1 -

3 6 7 7 7 7 9 A B B 8 A 7 6 7 A A 9 7 5 3 1 f 6 6 6 8 9 A A A 9 6 If If 7 9 9 8 6 3

3 It 6 8 9 9 9 9 8 7 5 3 + 7 8 8 6 2 3 6 8 8 8 6 5 3 3 2 + 6 6 It

-50 ~ 1 It 6 7 T It 2 2 2 2 2 3 + 1 -2 + 5 2 I 1 I I 3 3 2

I I 2 3 1 2 1 I 3 3 2 1

-75 Ishy

2 2 I I -I

I I I I I I

-100 -75 -50 -25 o 25 50 75 100 bull

x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

I I lr- I I I I

l-4-204771_ 45 I- r- shy

r shy

~ ~ - CENTER POINT 020 nmi ~r-40 - shy-

shy-r-shy

rshy35 - r- shy

r- _rshy -~ ~ 30 ~ - - shyoCt

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rshy25 r- shy

0 ~

0 r- shyr-W

m 20 shyE - - shygt z

- r-- shy15 r- shy-

I shy

10 - - shyI shy

-rshy-r shy

05 - - shy

- ~

rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

3 pound+ It 6 8 8 8 1 e 5 3 1 5 1 1 8 8 6 pound+

2 3 pound+ 5 7 8 8 8 1 6 5 5 5 6 6 6 6 8 I 8 6 2 50 ~ 2 3 5 8 lt) lt) lt) 8 6 2 3 5 7 7 6 6 7 8 lt) lt) 8 5 3 -

2 3 5 8 lt) A lt) 7 6 pound+ 1 8 8 1 5 7 8 8 lt) lt) 1 6 3 ~ 3 5 6 7 7 lt) lt) A A 7 5 3 1 6 8 lt) 7 5 3 5 8 lt) lt) lt) 7 3

1 pound+ 6 1 8 S lt) A lt) A 7 5 pound+ 1 3 lt) lt) 8 3 3 3 5 8 9 9 9 6 5 2 3 6 8 9 lt) lt) lt) lt) 8 lt) 8 lt) 8 6 1 A A lt) 6 7 1 8 9 lt) lt) 7 5 pound+ 2 1

0 0

25 ~ pound+

pound+

6 5

8 7

8 8

9 8

lt)

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lt)

lt)

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A A lt) 8 8 A A lt)

8 lt) A A A 8 A A B 8 A 8

6 5

If

1 2 3

2 2

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Of

5

5 5 I

6 5 I

7 6 I

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lt) lt) lt) lt) lt) 8 0 E 8 A A A A C 0 E e A B 8 ft- shy - shy

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lt)

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8 8 8

6 1 8

6 6 6

6 5 3

5 2 3

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2 5 6 6 1 2 5 6 7 8 8 8 1 6 5 6 8 8 1 1 5 It 3 1 1 5 6 6 6 6 6 6 6 5 If 1 1 8 6 5 3 1

3 6 1 1 6 5 2 2 pound+ If If 5 1 1 6 It 2 1 1 5 7 1 6 6 3 2 If 5 6 6 It

-50 - 1 pound+ 6 1 5 3 1 1 3 If If If 3 -3 If 5 1 2 2 2 If If 3

1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

~ u lt 0 U 0 lt

u 0 0 W (II

~ ~ Z

30

25

20

15

-

-

-

-

-rshy

10 -

05 -

o 10 20 30 40 50 60 70 80

rh 90 100

RANGE (nmi)

FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

s shy~

00 2

E c-gt -25

-50

f r

-

2 2 3 5 5 2

6 5 6 1 3 6 6 1 1 1 5 1 8 If 2 1 1 1 8 9 8 6 6 8 8 If 2 2

1 3 9 9 A 1 7 1 1 1 - 3 3 2 If 5 6 8 8 8 9 8 6 2 If If 3 2

q t II) 6 8 8 9 f T 5 t Cgt 3 1 ~ 1 If 5 T 9 A e a 8 8 6 It 3 5 5 5 5 1 9 8 C C 8 9 8 6

1 3 ~ 5 6 f 6 A C 0 E E A 8 5 1

1 5 7 1 8 ( 9 8 o E F F C 8 2 2 1 ~

ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

1 If 5 8 8 816 8 7 5 3 3 5 6 1 716 1 1 6 3

1 3 1 1 8 IJ 8 1 5 If 1 1 5 8 8 8 6 5 2 1

3 0 7 16 If 3 i If b If

1 1

-

-

-

-

-

-75 - -

-100 I I

-75 I I

-50

I

-25 o I

25

I

50

I

75 100

bull x (nmi East Mag)

bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

- r- I r r I I I 1 I

l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

35 ~ -

r-

t 30 laquo 0 U g laquo 25 u 0

0 W CD 20 ~ gt z

15

~ ~ -

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~-- -_rshy - ~

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~

~ --

10 - -shy

~ -

05

- shy - -

~

~l I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

--

CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

a w OJ ~ gt z

-

-

~

25

20

15

- -

-- -shy -

-shyrshy

~

~

I shy -shy -

-I

-

-

shy

~ ~10

~

- ~

-

~ -05 -

o 10 20 30

RANGE

40 50

Il (nmil

60

I

70 I

80

I

90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

1 It 5 6 6 7 7 9 A 0 0 2 It 5 6 7 7 7 7 9 A A

2 It 5 II 6 6 5 It 7 8 7 2 It 5 It 3 3 If 3 If If 3 I 2 3 2 2 3 2 1 I I 2 3 2 1 I

1 1

2 3 ~

It 5 6 5 6 6 6 t 5 6 5 5 It 3 7 J

If

7 3 8 3 - A

It 5 5 5 3 I

2 3 ~

2

-

-

-

-50 Ishy -

-75 Ishy -

bull bull

-100 I

-75 I I I

-50 -25 0 25

X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

0 15 ~ - shyw CD E shygt z

-~

~ -r shy10 shy-- - r-

~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

C42-1706

40

20

O~---+---++W---------i

-20 )

TMF 5005 -40 TUES JUNE 15 1976 1000 EDT

C)

lt 4i

u i 0 ~

I a 0 z E c

~

40

20

O~---f--l~_~----------l

-20

-40

x (nml EAST OF TMF MAG)

Fig 13 Day-to-day comparison of Philadelphia traffic

16

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

-~Z 30 I- shyf shy

-~ lL ltX f- - shya U a lti I- shy

lL 20 ~ I--

shyo a -- f-_ w -00 ~ -I shy -shyJ shyZ

I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

-1-4-20460 shy

fshy -

-50

~

cshy o Z

E c

50

o

f shy

~

I

2

I

I I

I 1 3 t 3 1 1

1 3 t 6 7 5 3 3 2 5 t 5 7 A A A 9 6 I 6

6 9 8 C 0 C A 6 3 5 7 C C E F E 0 8 9 8 C

2 7 9 C E G G G F 0 0 0 E 5 8 8 o E F G H G E E F F 7 9 Il euro --iH-6 II 6 amp--shy7 8 9 8 8 0 F G H I I I I 5 7 8 8 8 9 8 F H I J J J I 3 I I 3 2 3 C F r J J J

9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

I 5 6 5 2 3 3 2

I

I I I 2 I

I 2 3 2 I 2 2 2 t t 3 2

2 2 3 t ~ 6 r 2 2 2 3 3 5 6 D t I

6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

6 F F E [)-euro-- euro--iHt-amp---tr--6--tr-4 H G F E C C A A 9 7 6 6 6 6 I

I H l 0 8 A987t3t31 H G F C A 66132 G F E C 9 I 232 0 0 C C 8 9 7 2 ~ 5 I

9 8 C C C 8 A 8 7 7 6 t

5 8 A C C C 8 8 A 8 8 6 1

6 7 9 8 C C 8 A 9 8 6 t

1 3 5 6 7 9 8 8 B B 7 6 I

3 I 6 9 B B 9 8 5 3 3 5 7 9 9 9 6 3

1 1 I 3 6 7 6 3 1 I

I ~

-

-

-

-

- -

-100

I I

-50 I

o I I

50

I

taO

X (nmi East 1 Mag)

FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

E

c CJ

7 ~ shyI I shyU ~

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W CD

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z ~ - - shy

3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

2 If 6 888 8 C C 9 6 t 3 If A C 0 o C 8 8 It 8 8 7 6 6 6 If

2 t 7 9 888 DEE C A A It 8 E F F F 0 C 8 A A A 9 7 7 6 If 2 rshy~

o Z

0

2 5 8 9 ABC 0 E F FED 0 o E 379 A ceo 0 E F G G F G F F- - - - -

If 8 9 9 Ace 0 F F H H H H H

G G G G E 0 B A A A 9 9 8 7 5 G H G F E C A B 8 A 9 8 8 6 5

- r v bull v

H G FEe C A A 9 7 656 5 5

2

E c-

2 6 8 8 A A 8 C E G H I I 3lf5776AE G H I

I I

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H F C 8 899 7 6 2 1 If H G C 9 776 2

If

1 3

1 2 1 8 E F G H H GEe 9 5 5 2 gt- - 25 - 3 A C C 0 F E 0 C It A 8 5 5 5 2 -

5 8 8 7 A B 888 A A 9 7 6 3 If 6 6 1 6 9 A 8 8 8 A 8 5 1 2 5 If 1 1 2 7 A 8 B 8 8 5 2

2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

~7 shy

r-

t- ~~

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lti r shy

~

0 ~

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~

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4 shyz fshy -

rshy

-1--shy~ -

I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

75

I 2 2 I 3 J 2

2 + + 3 2 50 2 5 5 At J

I 3 2 I 2 + 5 5 5 2 3 At At At 3 + 5 Igt 5 + 1 1

I 3 5 6 6 7 Igt 8 5 5 3 I 2 3 2 1 2 3 At 6 8 8 8 1 2 Igt 8 8 l 2 I I + J I

25 I 2 2 5 A B A 1 Igt 1 7 1 5 5 6 Igt 5 3 1 2 3 3 1 CO D I I I At 8 A C C 8 8 + 3 I A 8 8 8 A 8 1 5 5 Igt 8 7 7 5 2 2 2 3 6 9 B C E E 0 C 9 8 A 0 0 0 0 8 A 1 Igt 1 1 8 8 7 5 2 ~ 2 At It 6 8 A C E F F F E 0 C C E F E 0 A 9 Igt Igt 7 7 7 7 5 1 ~ 0 Z

a 2 It

It

5

6

6

7

8

8

8

9

B C E F H I H GEE -++-t-j-fmiddot-~ oF-

A B C F H r J I H G

F FEe 8 9-9- f Dell a 8 9

8

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9

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7

8

6

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7 8 Igt 7 It 5

3

9 A A D G I I r I 4

7 8 9 9 0 G H H 11

66669CE G 2 + At + 7 9 A A C 0

G E C 1 G E f A

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8

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5

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5 5

5 5 + 3

3 3 2 2

I 3 + 5 1 9 9 9 8 A II A A II A 9 7 5 5 5 + I I I 3 + 5 7 8 8 9 8 r 889 A A ~ 8 8 7 5 1

2 3 3 + 6 Igt Igt 7 8 9 8 5 2 l 1 9 A A 9 7 5 I

2 3 3 57768A4 A I J 5 9 A 8 1 5

-50 2 3 I

3 5 2

Igt 5 1

7 Igt

7 5 5

7 1

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9 9

8

A 4

9

A

B

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8

1

8

5

1 J 5

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If

6 b

(I A II

7 9

A II

9

9 7

9 7 t

6 1

I + 5 5 Igt 7 II 8 7 7 b b 7 Igt It

I J J I b b i) b b b 5 J -75 1 3 + 5 I 1

I I 2

~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

-

7 CENTERPOINT -20 nmi -5 nmi -

6 - -rshylL

r shy _

lt -0 U 0 5 - -lt

lL _ r-

o -0 W 4 - -CD ~ ~ r-

z -

shy--

2 fshy -- -

rshy -

1-shyI--~-

-

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

Ishy

~-

t -75

-50

25

gt- -25

r-o 0 z

E c

1

1 1 2

A bull amp

1

2 2 2 1 If

2

2 2 2 2 4f

If bull

2

1

3 2 4f

5 1 V

4f

3

1 2 2 5 5 1 8 A V

6 If 2

1 2 1 1 3 3 2 2 1 7 3 2 2 2 2 5 6 6 5 3 1 6 7 7 3 2 3 2 2 1 6 8 9 9 8 4f 1 6 6 7 3 5 4f 4f 4f 1 1 7 9 B B A 8 poundf 2 3 At 9 7 8 8 8 6 6 At 4f 5 6 7 8 A C 0 C B 9 8 A A C 0 C 8 B 9 8 1 1 1 1 8 9 B C 0 0 0 0 C C 0 E E E o D B A 9 8 1 1 1 9 A C E F F E 0 E E F F E E 0 C 8 A 8 1 6 6 A - - shy - r _ A

V V V V

1 8 B E F G G G G G o C C B B 8 A 9 1 5 3 3 5 6 8 C F G G H H H G F 0 C 8 8 A 9 1 At 2 1 3 If 5 9 0 F G H H I H G F C C 8 9 8 6 3 2 L 3 6 A C E F Ii H H G E C 8 A 9 1 6 3

2 2 It 7 9 8 C 0 E F F 0 C B A 9 9 7 6 1 2 3 If 6 7 7 8 9 C C B A A B A A 8 7 5

1 2 If 5 6 6 7 7 8 8 9 9 A A 8 8 A 9 5 1 1 2 5 5 6 6 6 7 7 7 1 9 A 8 8 B 8 3

3 It If It At At If 5 5 6 8 A A A 9 3 1 2 2 2 2 1 2 3 t 6 8 A A 8 t

2 t 6 9 8 A 8 5 1 I 3 3 3 8 9 9 A 7 At

I 1 3 It t 1 1 8 8 3 1 2 3 If 2 1 5 6

I 1 1

7 8 7 7

3

5 6 6

5

2

3 At

4f 3 ~

1

1 1

-

-

-

-

I I I J I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-7 LA map TMF8055

A-9

- -

8 I I r- r J I I I

--4-20467 L ~7 shy

I shy

I- CENTERPOINT -5 nmi -15 nmi _6 ~

f shy

~shy 5 shy

IJ I- shyltX ~

n u I shyn

I shyltX r- r shy

~ ~- shyIJ o

l- f shy0 W CD ~ ~ ~ ~ z 3 - - shy

-rshy

~ f-f- shy2 - shy

-f- shy

~ ~-~ -I shy

- nTh+-_ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

2 3 3 6 1 881 665 6 6 6 6 It 1 1 3 5 6 1 8 9 981 888 8 1 1 6 ~

1 1 1 3 5 8 A 8 8 988 999 9 1 5 3 1 1 3 3 1 1 3 5 6 9 8 C D 989 A A 9 8 5 2 3 3 3 2

25 - 1 3 5 5 2 2 3 6 9 C o U A 9 A A 8 9 6 If 2 3 4f It 3 -1 3 5 5 6 5 1 A C o 0 888 889 6 If It 2

5 6 5 6 A 0 f E 0 C 8 C C 8 9 6 5 5 5 3 1 ~ 2 If 5 5 1 C E F F E o C 8 8 8 9 1 5 5 3 3 2

Lshy~

o z

0 1 1 12236 8 0 F F F E shy bull v

1 1 8 A A C 0 0 o 0

E 0 8 8 A A 1 5 - ~ v v

E C C 9 8 8 If

3 3 If If 2

3 1

2

E c

1 9 A A b B B 8 8 3 1 8 J 9 A A 9 9 A

0 C B 7 6 33 3 2 1 B A 8 6 3 2 3 3 2

gt- -25 - 3 5 6 7 8 9 8 9 9 1 2 5 5 6 1 1 8 8 8

A 9 2 1 5 2 1 2

1 2 2 2 1 3 3 3 2 1 -

5 6 6 5 5 6 7 1 1 6 222 2 3 3 3 2 1 3 5 6 6 6 5 5 5 5 5 If 3 1 122 3 3 2 1 3 5 6 6 5 5 3 If If 2 1 1 2 1 1 2 5 2 1 If 3 3 2 1 122 1

-50 - 1 233 3 2 1 222 1 -223 If 2 1 1 12 3 1 t

2 3 3 1 1 2 1

-75 ~ -

I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

35 ~ shy

I-r-

rshy -~ IJ 30 ~ shylaquo -a r-u shy -a laquo ~- shyIJ 25 l- I- I- shy0 -a - lshyw CD 20 I- shygt ~

-rshyz ~

- -15 - -~ ~ shyrshy

1-shy

r- 0 shy

rshy

-- -05 shy- Ishy

-

mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

~ 1 If 5 6 6 6 9 A B 0 0 0 lt- C B 9 7 5 If

2 3 5 6 6 7 8 A C 0 0 E 0 C B B A 9 7 5 1s ~

2 If If 5 6 7 9 A C 0 E o C 8 A A A 962 ~ o _0 3 5 6 -+-6--amp--e-9--fr~- ~--i---9--8-8 ~ ~ ~ ~ ~

Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

-50 - 332 -shy2 1

-75 1 - shy

1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

~25 shy

Ishy

Ishy~~ 20 shy

0 U Ishy0

r shyltt Ishy

lL ~o I-shylshy

~ Ishyffi 5 shyf-CD

~ gt z

- 0 shy-

05 shy

Ishy

~

h I I I o

10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

~

1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

1 3

1 1 2 2 2

1 3 3 3 3 1 3 2 If If 3 3 2 6 6 6 5 If 3 2

8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

-

--

-

-75 ~

--

-

1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

~

-shyz

10 ~ shy-

05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

0 --

3 5

- shy6 5 5

6

7

7

-9

A

A

n

A 8

n

8

9

8

n

C A

9

-9 9

-

9

-

8

-

1 2

3 3

v

If v

If

_

3

ft

shy

1

E c

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5 3

2

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6 3

6 6

7 6

8 8

9

8 8 8

8

9 7 8

7 8

9

9 A A

C 8 C 0

8 0

A

8 9 9

8 7

6 3

2 2

2

2

2

2

2 2 2 3 1

1 1 If 5 7 9 8 C 8 8 9 9 C C 8 A 7 3 1 1 gtshy -25 ~ 1 1 2 7 A C C C 8 A A 9 8 8 9 6 -

2 3 3 3 If 6 A C C C A A 9 9 9 9 5 2 3 If 5 5 6 9 8 8 A 8 8 8 9 7 If

2 If 6 6 6 6 7 8 8 7 5 5 7 7 5 3 2 If 6 6 6 5 If 6 6 5 6 6 7 6 If

-50 ~ If 5 6 5 2 3 5 6 8 7 7 3 -2 If If 2 5 7 8 7 6

1 3 6 T 7 6 If

1 3 If 6 6 6 If

2 If 5 5 If 2

-75 - 2 3 2 1 -

I I ~J I 1 I i I I A shy

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

-- -

Ishy

-4 shy- shy

IJ shylaquo 0 I- shyu ~ 0

laquo IJ

3 - shy~ 0 f- shy-0 - l- I-- IshyIJJ shyCD - E I-lshygt shyz

2 - shy~ -f-

-fshy -

~ shy

I- shy

-

J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

Lshy ~

o Z

0

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5 f ~ 2

5 5

l

6 5

1

6 6

1

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6 8

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9

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U

A 9

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8 8 C

C C 8 9 A 9 8 T 5 5 5 f It 3 1 eBB B B A 9 7 5 5 5 5 5 5 3 A A A A bull - shy - - shy - ~ u U _JJJoJamp

C 8 A A A A 8 5 5 5 5 5 5 + 3

E c-

1 2

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1 f

2

+ 2

5

f

6 6 7 8 7 7 8

9 9 A A A 8

B A A A

A A 9 A A 9

9

8 9 7

8 6 5 7 5 If

It 1 3

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+ 5 5 5 +

3

3 It 6 6 6 6 7 8 A amp 8 8 A A A 9 9 9 8 i 6 3 1 2 3 3 2 gt- -25 ~ 3 Ii 7 7 1 7 8 9 B B 8 B A lt1 8 8 9 9 8 7 + 1 -

3 6 7 7 7 7 9 A B B 8 A 7 6 7 A A 9 7 5 3 1 f 6 6 6 8 9 A A A 9 6 If If 7 9 9 8 6 3

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I I 2 3 1 2 1 I 3 3 2 1

-75 Ishy

2 2 I I -I

I I I I I I

-100 -75 -50 -25 o 25 50 75 100 bull

x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

I I lr- I I I I

l-4-204771_ 45 I- r- shy

r shy

~ ~ - CENTER POINT 020 nmi ~r-40 - shy-

shy-r-shy

rshy35 - r- shy

r- _rshy -~ ~ 30 ~ - - shyoCt

Ir shy ~ 0 U 0 oCt

rshy25 r- shy

0 ~

0 r- shyr-W

m 20 shyE - - shygt z

- r-- shy15 r- shy-

I shy

10 - - shyI shy

-rshy-r shy

05 - - shy

- ~

rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

3 pound+ It 6 8 8 8 1 e 5 3 1 5 1 1 8 8 6 pound+

2 3 pound+ 5 7 8 8 8 1 6 5 5 5 6 6 6 6 8 I 8 6 2 50 ~ 2 3 5 8 lt) lt) lt) 8 6 2 3 5 7 7 6 6 7 8 lt) lt) 8 5 3 -

2 3 5 8 lt) A lt) 7 6 pound+ 1 8 8 1 5 7 8 8 lt) lt) 1 6 3 ~ 3 5 6 7 7 lt) lt) A A 7 5 3 1 6 8 lt) 7 5 3 5 8 lt) lt) lt) 7 3

1 pound+ 6 1 8 S lt) A lt) A 7 5 pound+ 1 3 lt) lt) 8 3 3 3 5 8 9 9 9 6 5 2 3 6 8 9 lt) lt) lt) lt) 8 lt) 8 lt) 8 6 1 A A lt) 6 7 1 8 9 lt) lt) 7 5 pound+ 2 1

0 0

25 ~ pound+

pound+

6 5

8 7

8 8

9 8

lt)

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lt)

lt)

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6 5

If

1 2 3

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Of

5

5 5 I

6 5 I

7 6 I

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lt) lt) lt) lt) lt) 8 0 E 8 A A A A C 0 E e A B 8 ft- shy - shy

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8 8

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3 3- L bull

z 2 3 3 5 6 7 8 8 8 8 8 B B 0 0 C lt) 7 6 1 1 6 6 If 3 3 3 3 2

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3

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1

6 6 1 6

6 1 6

6 6 5

8 7

6

lt)

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lt)

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9 lt)

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6 6 6

6 5 3

5 2 3

3 2

1

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1

gtshy shy-25 6 1 1 6 3 6 1 8 8 lt) lt) 8 6 6 8 lt) lt) 8 5 5 2 -

2 5 6 6 1 2 5 6 7 8 8 8 1 6 5 6 8 8 1 1 5 It 3 1 1 5 6 6 6 6 6 6 6 5 If 1 1 8 6 5 3 1

3 6 1 1 6 5 2 2 pound+ If If 5 1 1 6 It 2 1 1 5 7 1 6 6 3 2 If 5 6 6 It

-50 - 1 pound+ 6 1 5 3 1 1 3 If If If 3 -3 If 5 1 2 2 2 If If 3

1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

~ u lt 0 U 0 lt

u 0 0 W (II

~ ~ Z

30

25

20

15

-

-

-

-

-rshy

10 -

05 -

o 10 20 30 40 50 60 70 80

rh 90 100

RANGE (nmi)

FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

s shy~

00 2

E c-gt -25

-50

f r

-

2 2 3 5 5 2

6 5 6 1 3 6 6 1 1 1 5 1 8 If 2 1 1 1 8 9 8 6 6 8 8 If 2 2

1 3 9 9 A 1 7 1 1 1 - 3 3 2 If 5 6 8 8 8 9 8 6 2 If If 3 2

q t II) 6 8 8 9 f T 5 t Cgt 3 1 ~ 1 If 5 T 9 A e a 8 8 6 It 3 5 5 5 5 1 9 8 C C 8 9 8 6

1 3 ~ 5 6 f 6 A C 0 E E A 8 5 1

1 5 7 1 8 ( 9 8 o E F F C 8 2 2 1 ~

ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

1 If 5 8 8 816 8 7 5 3 3 5 6 1 716 1 1 6 3

1 3 1 1 8 IJ 8 1 5 If 1 1 5 8 8 8 6 5 2 1

3 0 7 16 If 3 i If b If

1 1

-

-

-

-

-

-75 - -

-100 I I

-75 I I

-50

I

-25 o I

25

I

50

I

75 100

bull x (nmi East Mag)

bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

- r- I r r I I I 1 I

l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

35 ~ -

r-

t 30 laquo 0 U g laquo 25 u 0

0 W CD 20 ~ gt z

15

~ ~ -

~ - -- -~ -shy

~-- -_rshy - ~

-- ~ ~

~

~ --

10 - -shy

~ -

05

- shy - -

~

~l I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

--

CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

a w OJ ~ gt z

-

-

~

25

20

15

- -

-- -shy -

-shyrshy

~

~

I shy -shy -

-I

-

-

shy

~ ~10

~

- ~

-

~ -05 -

o 10 20 30

RANGE

40 50

Il (nmil

60

I

70 I

80

I

90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

1 It 5 6 6 7 7 9 A 0 0 2 It 5 6 7 7 7 7 9 A A

2 It 5 II 6 6 5 It 7 8 7 2 It 5 It 3 3 If 3 If If 3 I 2 3 2 2 3 2 1 I I 2 3 2 1 I

1 1

2 3 ~

It 5 6 5 6 6 6 t 5 6 5 5 It 3 7 J

If

7 3 8 3 - A

It 5 5 5 3 I

2 3 ~

2

-

-

-

-50 Ishy -

-75 Ishy -

bull bull

-100 I

-75 I I I

-50 -25 0 25

X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

0 15 ~ - shyw CD E shygt z

-~

~ -r shy10 shy-- - r-

~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

C42-1707

001 ~ AIRCRAFT 02 f PER nml 2

20

O~----~~~-It--+----------4

-20

TMF 3008 -40 WED MARCH 101976 11 42 EST

-C) 404 2

~ 2 20 ~ X 0 a i

-20e c TMF 3031 gt- -40 FR I MARCH 26 1976 2045 EST

TMF 3037 MON MARCH 29 197 15 40 EST

-

Fig14 Day-to-day comparison of Boston traffic

17

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

-~Z 30 I- shyf shy

-~ lL ltX f- - shya U a lti I- shy

lL 20 ~ I--

shyo a -- f-_ w -00 ~ -I shy -shyJ shyZ

I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

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Fig A-II Washington map TMF400I

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FigA-12 Washington histogram TMF4001

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FigA-14 Washington histogram TMF4054

A-16

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1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

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u 0 0 W (II

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25

20

15

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-

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-rshy

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rh 90 100

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FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

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ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

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75 100

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bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

- r- I r r I I I 1 I

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RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

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2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

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j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

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CENTER POINT -5 omi 0 -

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40 50

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I

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FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

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2 5 ~ 01 0 e L-~ 00 Z

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2 bull

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__ AA __

V w w ~ ~

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bull bull

-100 I

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X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

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~-~

--

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I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

fact that the Philadelphia traffic is much more uniformly distributed (as seen in Fig 9) and so minor fluctuations in density can cause noticeable changes in the shapes of the shaded regions in Fig 13

More detailed computer outputs for all of these cases are given in the Appendix

18

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

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ltX w

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I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

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I ~

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FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

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3 - shy

r-shy~2 - shy

1shy

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shy ~ o 10 20 30 40 50 60 70 80 90 100

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FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

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7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

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I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

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FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

75

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X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

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FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

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V V V V

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FigA-7 LA map TMF8055

A-9

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FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

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- FigA-9 Washington map TMF4039

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FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

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Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

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X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

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FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

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bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

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X (nmi East Mag)

FigA-I3 Washington map TMF4054

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FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

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l-4-204141_

1 1 75 - 3 If If 3 3 1 -

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2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

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X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

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FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

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2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

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FigA-17 Philadelphia map TMFS026

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FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

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FigA-19 Philadelphia map TMF5005

A-21

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FigA-20 Philadelphia histogram TMFSOOS

A-22

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bullbull11 FigA-21 Boston map TMF3031

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FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

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FigA-23 Boston map TMF3037

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A-26

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Fig A-25 Boston map TMF3008

I

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LL 0

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-~

~ -r shy10 shy-- - r-

~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

40 COMPARISON WITH THE STANDARD LA HIGH DENSITY MODEL

The LA Basin measurements have been compared with the LA Basin Standard Traffic Model (the high density 1982 model ref 6) herein called the LAl traffic model A copy of the model was obtained on magnetic tape and applied as the input to the traffic density analysis program It was observed that traffic density increased steadily throughout the time period during which the model was taped and for this reason the latter portion was selected for density analysis (time = 45856 to 46796 sec) The resulting density map (for R = 10 nmi) is shown in Fig 15 Peak density at p = 048 aircraft per sq nmi occurs in the Long Beach area and about this location are computed the range histogram plotted in Fig 16 the cumulative range distribution plotted in Fig 11 and the instantaneous count uf aircraft within 10 nmi plotted in Fig 17 A straightforward comparison between model and measureshyment is shown in Fig 18 where rotation and offset have been applied to adjust for the difference in origins and the difference between true and magnetic north It is apparent that the model and the measurement agree closely in spatial distribution but differ in scale by about 51

19

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

-~Z 30 I- shyf shy

-~ lL ltX f- - shya U a lti I- shy

lL 20 ~ I--

shyo a -- f-_ w -00 ~ -I shy -shyJ shyZ

I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

-1-4-20460 shy

fshy -

-50

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cshy o Z

E c

50

o

f shy

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I

2

I

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6 9 8 C 0 C A 6 3 5 7 C C E F E 0 8 9 8 C

2 7 9 C E G G G F 0 0 0 E 5 8 8 o E F G H G E E F F 7 9 Il euro --iH-6 II 6 amp--shy7 8 9 8 8 0 F G H I I I I 5 7 8 8 8 9 8 F H I J J J I 3 I I 3 2 3 C F r J J J

9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

I 5 6 5 2 3 3 2

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I I I 2 I

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2 2 3 t ~ 6 r 2 2 2 3 3 5 6 D t I

6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

6 F F E [)-euro-- euro--iHt-amp---tr--6--tr-4 H G F E C C A A 9 7 6 6 6 6 I

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1 3 5 6 7 9 8 8 B B 7 6 I

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1 1 I 3 6 7 6 3 1 I

I ~

-

-

-

-

- -

-100

I I

-50 I

o I I

50

I

taO

X (nmi East 1 Mag)

FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

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z ~ - - shy

3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

2 If 6 888 8 C C 9 6 t 3 If A C 0 o C 8 8 It 8 8 7 6 6 6 If

2 t 7 9 888 DEE C A A It 8 E F F F 0 C 8 A A A 9 7 7 6 If 2 rshy~

o Z

0

2 5 8 9 ABC 0 E F FED 0 o E 379 A ceo 0 E F G G F G F F- - - - -

If 8 9 9 Ace 0 F F H H H H H

G G G G E 0 B A A A 9 9 8 7 5 G H G F E C A B 8 A 9 8 8 6 5

- r v bull v

H G FEe C A A 9 7 656 5 5

2

E c-

2 6 8 8 A A 8 C E G H I I 3lf5776AE G H I

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1 3

1 2 1 8 E F G H H GEe 9 5 5 2 gt- - 25 - 3 A C C 0 F E 0 C It A 8 5 5 5 2 -

5 8 8 7 A B 888 A A 9 7 6 3 If 6 6 1 6 9 A 8 8 8 A 8 5 1 2 5 If 1 1 2 7 A 8 B 8 8 5 2

2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

~7 shy

r-

t- ~~

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rshy

-1--shy~ -

I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

75

I 2 2 I 3 J 2

2 + + 3 2 50 2 5 5 At J

I 3 2 I 2 + 5 5 5 2 3 At At At 3 + 5 Igt 5 + 1 1

I 3 5 6 6 7 Igt 8 5 5 3 I 2 3 2 1 2 3 At 6 8 8 8 1 2 Igt 8 8 l 2 I I + J I

25 I 2 2 5 A B A 1 Igt 1 7 1 5 5 6 Igt 5 3 1 2 3 3 1 CO D I I I At 8 A C C 8 8 + 3 I A 8 8 8 A 8 1 5 5 Igt 8 7 7 5 2 2 2 3 6 9 B C E E 0 C 9 8 A 0 0 0 0 8 A 1 Igt 1 1 8 8 7 5 2 ~ 2 At It 6 8 A C E F F F E 0 C C E F E 0 A 9 Igt Igt 7 7 7 7 5 1 ~ 0 Z

a 2 It

It

5

6

6

7

8

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9 A A D G I I r I 4

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5 5 + 3

3 3 2 2

I 3 + 5 1 9 9 9 8 A II A A II A 9 7 5 5 5 + I I I 3 + 5 7 8 8 9 8 r 889 A A ~ 8 8 7 5 1

2 3 3 + 6 Igt Igt 7 8 9 8 5 2 l 1 9 A A 9 7 5 I

2 3 3 57768A4 A I J 5 9 A 8 1 5

-50 2 3 I

3 5 2

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7 Igt

7 5 5

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8

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9

A

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8

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8

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7 9

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9

9 7

9 7 t

6 1

I + 5 5 Igt 7 II 8 7 7 b b 7 Igt It

I J J I b b i) b b b 5 J -75 1 3 + 5 I 1

I I 2

~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

-

7 CENTERPOINT -20 nmi -5 nmi -

6 - -rshylL

r shy _

lt -0 U 0 5 - -lt

lL _ r-

o -0 W 4 - -CD ~ ~ r-

z -

shy--

2 fshy -- -

rshy -

1-shyI--~-

-

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

Ishy

~-

t -75

-50

25

gt- -25

r-o 0 z

E c

1

1 1 2

A bull amp

1

2 2 2 1 If

2

2 2 2 2 4f

If bull

2

1

3 2 4f

5 1 V

4f

3

1 2 2 5 5 1 8 A V

6 If 2

1 2 1 1 3 3 2 2 1 7 3 2 2 2 2 5 6 6 5 3 1 6 7 7 3 2 3 2 2 1 6 8 9 9 8 4f 1 6 6 7 3 5 4f 4f 4f 1 1 7 9 B B A 8 poundf 2 3 At 9 7 8 8 8 6 6 At 4f 5 6 7 8 A C 0 C B 9 8 A A C 0 C 8 B 9 8 1 1 1 1 8 9 B C 0 0 0 0 C C 0 E E E o D B A 9 8 1 1 1 9 A C E F F E 0 E E F F E E 0 C 8 A 8 1 6 6 A - - shy - r _ A

V V V V

1 8 B E F G G G G G o C C B B 8 A 9 1 5 3 3 5 6 8 C F G G H H H G F 0 C 8 8 A 9 1 At 2 1 3 If 5 9 0 F G H H I H G F C C 8 9 8 6 3 2 L 3 6 A C E F Ii H H G E C 8 A 9 1 6 3

2 2 It 7 9 8 C 0 E F F 0 C B A 9 9 7 6 1 2 3 If 6 7 7 8 9 C C B A A B A A 8 7 5

1 2 If 5 6 6 7 7 8 8 9 9 A A 8 8 A 9 5 1 1 2 5 5 6 6 6 7 7 7 1 9 A 8 8 B 8 3

3 It If It At At If 5 5 6 8 A A A 9 3 1 2 2 2 2 1 2 3 t 6 8 A A 8 t

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4f 3 ~

1

1 1

-

-

-

-

I I I J I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-7 LA map TMF8055

A-9

- -

8 I I r- r J I I I

--4-20467 L ~7 shy

I shy

I- CENTERPOINT -5 nmi -15 nmi _6 ~

f shy

~shy 5 shy

IJ I- shyltX ~

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l- f shy0 W CD ~ ~ ~ ~ z 3 - - shy

-rshy

~ f-f- shy2 - shy

-f- shy

~ ~-~ -I shy

- nTh+-_ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

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5 6 5 6 A 0 f E 0 C 8 C C 8 9 6 5 5 5 3 1 ~ 2 If 5 5 1 C E F F E o C 8 8 8 9 1 5 5 3 3 2

Lshy~

o z

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1 1 8 A A C 0 0 o 0

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E C C 9 8 8 If

3 3 If If 2

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2

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1 9 A A b B B 8 8 3 1 8 J 9 A A 9 9 A

0 C B 7 6 33 3 2 1 B A 8 6 3 2 3 3 2

gt- -25 - 3 5 6 7 8 9 8 9 9 1 2 5 5 6 1 1 8 8 8

A 9 2 1 5 2 1 2

1 2 2 2 1 3 3 3 2 1 -

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-50 - 1 233 3 2 1 222 1 -223 If 2 1 1 12 3 1 t

2 3 3 1 1 2 1

-75 ~ -

I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

35 ~ shy

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1-shy

r- 0 shy

rshy

-- -05 shy- Ishy

-

mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

~ 1 If 5 6 6 6 9 A B 0 0 0 lt- C B 9 7 5 If

2 3 5 6 6 7 8 A C 0 0 E 0 C B B A 9 7 5 1s ~

2 If If 5 6 7 9 A C 0 E o C 8 A A A 962 ~ o _0 3 5 6 -+-6--amp--e-9--fr~- ~--i---9--8-8 ~ ~ ~ ~ ~

Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

-50 - 332 -shy2 1

-75 1 - shy

1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

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Ishy

Ishy~~ 20 shy

0 U Ishy0

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- 0 shy-

05 shy

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h I I I o

10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

~

1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

1 3

1 1 2 2 2

1 3 3 3 3 1 3 2 If If 3 3 2 6 6 6 5 If 3 2

8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

-

--

-

-75 ~

--

-

1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

~

-shyz

10 ~ shy-

05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

0 --

3 5

- shy6 5 5

6

7

7

-9

A

A

n

A 8

n

8

9

8

n

C A

9

-9 9

-

9

-

8

-

1 2

3 3

v

If v

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3

ft

shy

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2

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6 3

6 6

7 6

8 8

9

8 8 8

8

9 7 8

7 8

9

9 A A

C 8 C 0

8 0

A

8 9 9

8 7

6 3

2 2

2

2

2

2

2 2 2 3 1

1 1 If 5 7 9 8 C 8 8 9 9 C C 8 A 7 3 1 1 gtshy -25 ~ 1 1 2 7 A C C C 8 A A 9 8 8 9 6 -

2 3 3 3 If 6 A C C C A A 9 9 9 9 5 2 3 If 5 5 6 9 8 8 A 8 8 8 9 7 If

2 If 6 6 6 6 7 8 8 7 5 5 7 7 5 3 2 If 6 6 6 5 If 6 6 5 6 6 7 6 If

-50 ~ If 5 6 5 2 3 5 6 8 7 7 3 -2 If If 2 5 7 8 7 6

1 3 6 T 7 6 If

1 3 If 6 6 6 If

2 If 5 5 If 2

-75 - 2 3 2 1 -

I I ~J I 1 I i I I A shy

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

-- -

Ishy

-4 shy- shy

IJ shylaquo 0 I- shyu ~ 0

laquo IJ

3 - shy~ 0 f- shy-0 - l- I-- IshyIJJ shyCD - E I-lshygt shyz

2 - shy~ -f-

-fshy -

~ shy

I- shy

-

J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

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0

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l

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f

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3

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3 6 7 7 7 7 9 A B B 8 A 7 6 7 A A 9 7 5 3 1 f 6 6 6 8 9 A A A 9 6 If If 7 9 9 8 6 3

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I I 2 3 1 2 1 I 3 3 2 1

-75 Ishy

2 2 I I -I

I I I I I I

-100 -75 -50 -25 o 25 50 75 100 bull

x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

I I lr- I I I I

l-4-204771_ 45 I- r- shy

r shy

~ ~ - CENTER POINT 020 nmi ~r-40 - shy-

shy-r-shy

rshy35 - r- shy

r- _rshy -~ ~ 30 ~ - - shyoCt

Ir shy ~ 0 U 0 oCt

rshy25 r- shy

0 ~

0 r- shyr-W

m 20 shyE - - shygt z

- r-- shy15 r- shy-

I shy

10 - - shyI shy

-rshy-r shy

05 - - shy

- ~

rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

3 pound+ It 6 8 8 8 1 e 5 3 1 5 1 1 8 8 6 pound+

2 3 pound+ 5 7 8 8 8 1 6 5 5 5 6 6 6 6 8 I 8 6 2 50 ~ 2 3 5 8 lt) lt) lt) 8 6 2 3 5 7 7 6 6 7 8 lt) lt) 8 5 3 -

2 3 5 8 lt) A lt) 7 6 pound+ 1 8 8 1 5 7 8 8 lt) lt) 1 6 3 ~ 3 5 6 7 7 lt) lt) A A 7 5 3 1 6 8 lt) 7 5 3 5 8 lt) lt) lt) 7 3

1 pound+ 6 1 8 S lt) A lt) A 7 5 pound+ 1 3 lt) lt) 8 3 3 3 5 8 9 9 9 6 5 2 3 6 8 9 lt) lt) lt) lt) 8 lt) 8 lt) 8 6 1 A A lt) 6 7 1 8 9 lt) lt) 7 5 pound+ 2 1

0 0

25 ~ pound+

pound+

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8 7

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lt)

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lt)

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6 5

If

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2 5 6 6 1 2 5 6 7 8 8 8 1 6 5 6 8 8 1 1 5 It 3 1 1 5 6 6 6 6 6 6 6 5 If 1 1 8 6 5 3 1

3 6 1 1 6 5 2 2 pound+ If If 5 1 1 6 It 2 1 1 5 7 1 6 6 3 2 If 5 6 6 It

-50 - 1 pound+ 6 1 5 3 1 1 3 If If If 3 -3 If 5 1 2 2 2 If If 3

1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

~ u lt 0 U 0 lt

u 0 0 W (II

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30

25

20

15

-

-

-

-

-rshy

10 -

05 -

o 10 20 30 40 50 60 70 80

rh 90 100

RANGE (nmi)

FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

s shy~

00 2

E c-gt -25

-50

f r

-

2 2 3 5 5 2

6 5 6 1 3 6 6 1 1 1 5 1 8 If 2 1 1 1 8 9 8 6 6 8 8 If 2 2

1 3 9 9 A 1 7 1 1 1 - 3 3 2 If 5 6 8 8 8 9 8 6 2 If If 3 2

q t II) 6 8 8 9 f T 5 t Cgt 3 1 ~ 1 If 5 T 9 A e a 8 8 6 It 3 5 5 5 5 1 9 8 C C 8 9 8 6

1 3 ~ 5 6 f 6 A C 0 E E A 8 5 1

1 5 7 1 8 ( 9 8 o E F F C 8 2 2 1 ~

ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

1 If 5 8 8 816 8 7 5 3 3 5 6 1 716 1 1 6 3

1 3 1 1 8 IJ 8 1 5 If 1 1 5 8 8 8 6 5 2 1

3 0 7 16 If 3 i If b If

1 1

-

-

-

-

-

-75 - -

-100 I I

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-50

I

-25 o I

25

I

50

I

75 100

bull x (nmi East Mag)

bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

- r- I r r I I I 1 I

l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

35 ~ -

r-

t 30 laquo 0 U g laquo 25 u 0

0 W CD 20 ~ gt z

15

~ ~ -

~ - -- -~ -shy

~-- -_rshy - ~

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~

~ --

10 - -shy

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05

- shy - -

~

~l I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

--

CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

a w OJ ~ gt z

-

-

~

25

20

15

- -

-- -shy -

-shyrshy

~

~

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-I

-

-

shy

~ ~10

~

- ~

-

~ -05 -

o 10 20 30

RANGE

40 50

Il (nmil

60

I

70 I

80

I

90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

1 It 5 6 6 7 7 9 A 0 0 2 It 5 6 7 7 7 7 9 A A

2 It 5 II 6 6 5 It 7 8 7 2 It 5 It 3 3 If 3 If If 3 I 2 3 2 2 3 2 1 I I 2 3 2 1 I

1 1

2 3 ~

It 5 6 5 6 6 6 t 5 6 5 5 It 3 7 J

If

7 3 8 3 - A

It 5 5 5 3 I

2 3 ~

2

-

-

-

-50 Ishy -

-75 Ishy -

bull bull

-100 I

-75 I I I

-50 -25 0 25

X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

0 15 ~ - shyw CD E shygt z

-~

~ -r shy10 shy-- - r-

~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

100

75

50

2

25 5

cu 5 J 3 ~

3 r- 0 0Z

1 E 6 c 6 gt- 3

-25

~50

CENTER POINTshy1--__ 01 AIRCRAFTnmi-75 LA INTERNATIONAL AIRPORT

RANGE -10 nmi ~--001

-100 -50 o 50 100

x (nmi East True)

FigIS Traffic density map LAI traffic model

20

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

-~Z 30 I- shyf shy

-~ lL ltX f- - shya U a lti I- shy

lL 20 ~ I--

shyo a -- f-_ w -00 ~ -I shy -shyJ shyZ

I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

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1 1 I 3 6 7 6 3 1 I

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100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

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FigA-5 LA map TMF8046

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FigA-6 LA histogram TMF8046

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FigA-8 LA histogram TMF8055

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A-II

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FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

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Fig A-II Washington map TMF400I

A-I3

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CENTERPOI NT 05 nmi

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FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

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FigA-I3 Washington map TMF4054

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FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

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2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

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FigA-15 Philadelphia map TMF5I39

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FigA-16 Philadelphia histogram TMF5I39

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rh- o 10 20 30 40 50 60 70 80 90 100

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FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

3 pound+ It 6 8 8 8 1 e 5 3 1 5 1 1 8 8 6 pound+

2 3 pound+ 5 7 8 8 8 1 6 5 5 5 6 6 6 6 8 I 8 6 2 50 ~ 2 3 5 8 lt) lt) lt) 8 6 2 3 5 7 7 6 6 7 8 lt) lt) 8 5 3 -

2 3 5 8 lt) A lt) 7 6 pound+ 1 8 8 1 5 7 8 8 lt) lt) 1 6 3 ~ 3 5 6 7 7 lt) lt) A A 7 5 3 1 6 8 lt) 7 5 3 5 8 lt) lt) lt) 7 3

1 pound+ 6 1 8 S lt) A lt) A 7 5 pound+ 1 3 lt) lt) 8 3 3 3 5 8 9 9 9 6 5 2 3 6 8 9 lt) lt) lt) lt) 8 lt) 8 lt) 8 6 1 A A lt) 6 7 1 8 9 lt) lt) 7 5 pound+ 2 1

0 0

25 ~ pound+

pound+

6 5

8 7

8 8

9 8

lt)

8 8 8

lt)

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A A lt) 8 8 A A lt)

8 lt) A A A 8 A A B 8 A 8

6 5

If

1 2 3

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Of

5

5 5 I

6 5 I

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2

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1

6 6 1 6

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6 6 5

8 7

6

lt)

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9 lt)

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C C A 8 8 8 A lt)

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8 8 8

6 1 8

6 6 6

6 5 3

5 2 3

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1

gtshy shy-25 6 1 1 6 3 6 1 8 8 lt) lt) 8 6 6 8 lt) lt) 8 5 5 2 -

2 5 6 6 1 2 5 6 7 8 8 8 1 6 5 6 8 8 1 1 5 It 3 1 1 5 6 6 6 6 6 6 6 5 If 1 1 8 6 5 3 1

3 6 1 1 6 5 2 2 pound+ If If 5 1 1 6 It 2 1 1 5 7 1 6 6 3 2 If 5 6 6 It

-50 - 1 pound+ 6 1 5 3 1 1 3 If If If 3 -3 If 5 1 2 2 2 If If 3

1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

~ u lt 0 U 0 lt

u 0 0 W (II

~ ~ Z

30

25

20

15

-

-

-

-

-rshy

10 -

05 -

o 10 20 30 40 50 60 70 80

rh 90 100

RANGE (nmi)

FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

s shy~

00 2

E c-gt -25

-50

f r

-

2 2 3 5 5 2

6 5 6 1 3 6 6 1 1 1 5 1 8 If 2 1 1 1 8 9 8 6 6 8 8 If 2 2

1 3 9 9 A 1 7 1 1 1 - 3 3 2 If 5 6 8 8 8 9 8 6 2 If If 3 2

q t II) 6 8 8 9 f T 5 t Cgt 3 1 ~ 1 If 5 T 9 A e a 8 8 6 It 3 5 5 5 5 1 9 8 C C 8 9 8 6

1 3 ~ 5 6 f 6 A C 0 E E A 8 5 1

1 5 7 1 8 ( 9 8 o E F F C 8 2 2 1 ~

ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

1 If 5 8 8 816 8 7 5 3 3 5 6 1 716 1 1 6 3

1 3 1 1 8 IJ 8 1 5 If 1 1 5 8 8 8 6 5 2 1

3 0 7 16 If 3 i If b If

1 1

-

-

-

-

-

-75 - -

-100 I I

-75 I I

-50

I

-25 o I

25

I

50

I

75 100

bull x (nmi East Mag)

bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

- r- I r r I I I 1 I

l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

35 ~ -

r-

t 30 laquo 0 U g laquo 25 u 0

0 W CD 20 ~ gt z

15

~ ~ -

~ - -- -~ -shy

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-- ~ ~

~

~ --

10 - -shy

~ -

05

- shy - -

~

~l I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

--

CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

a w OJ ~ gt z

-

-

~

25

20

15

- -

-- -shy -

-shyrshy

~

~

I shy -shy -

-I

-

-

shy

~ ~10

~

- ~

-

~ -05 -

o 10 20 30

RANGE

40 50

Il (nmil

60

I

70 I

80

I

90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

1 It 5 6 6 7 7 9 A 0 0 2 It 5 6 7 7 7 7 9 A A

2 It 5 II 6 6 5 It 7 8 7 2 It 5 It 3 3 If 3 If If 3 I 2 3 2 2 3 2 1 I I 2 3 2 1 I

1 1

2 3 ~

It 5 6 5 6 6 6 t 5 6 5 5 It 3 7 J

If

7 3 8 3 - A

It 5 5 5 3 I

2 3 ~

2

-

-

-

-50 Ishy -

-75 Ishy -

bull bull

-100 I

-75 I I I

-50 -25 0 25

X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

0 15 ~ - shyw CD E shygt z

-~

~ -r shy10 shy-- - r-

~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

- ---

-r - 1 I I I T l18-4-20455 L

~50 shy

~ -

z I bull

~ shy00 40 I-r- shy

E shyc CJ shy --r ~

U 1--

ltX w

-~Z 30 I- shyf shy

-~ lL ltX f- - shya U a lti I- shy

lL 20 ~ I--

shyo a -- f-_ w -00 ~ -I shy -shyJ shyZ

I-- - f-I-shy

rshy10 l- f- shy

~ ~ I shy

1--- shyIIlh

o 20 40 60 80 100

RANGE (nmi)

Fig16 Range distribution histogram for the LA1 traffic model

21

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

-1-4-20460 shy

fshy -

-50

~

cshy o Z

E c

50

o

f shy

~

I

2

I

I I

I 1 3 t 3 1 1

1 3 t 6 7 5 3 3 2 5 t 5 7 A A A 9 6 I 6

6 9 8 C 0 C A 6 3 5 7 C C E F E 0 8 9 8 C

2 7 9 C E G G G F 0 0 0 E 5 8 8 o E F G H G E E F F 7 9 Il euro --iH-6 II 6 amp--shy7 8 9 8 8 0 F G H I I I I 5 7 8 8 8 9 8 F H I J J J I 3 I I 3 2 3 C F r J J J

9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

I 5 6 5 2 3 3 2

I

I I I 2 I

I 2 3 2 I 2 2 2 t t 3 2

2 2 3 t ~ 6 r 2 2 2 3 3 5 6 D t I

6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

6 F F E [)-euro-- euro--iHt-amp---tr--6--tr-4 H G F E C C A A 9 7 6 6 6 6 I

I H l 0 8 A987t3t31 H G F C A 66132 G F E C 9 I 232 0 0 C C 8 9 7 2 ~ 5 I

9 8 C C C 8 A 8 7 7 6 t

5 8 A C C C 8 8 A 8 8 6 1

6 7 9 8 C C 8 A 9 8 6 t

1 3 5 6 7 9 8 8 B B 7 6 I

3 I 6 9 B B 9 8 5 3 3 5 7 9 9 9 6 3

1 1 I 3 6 7 6 3 1 I

I ~

-

-

-

-

- -

-100

I I

-50 I

o I I

50

I

taO

X (nmi East 1 Mag)

FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

E

c CJ

7 ~ shyI I shyU ~

ltt ~ -shyw Z I- shy

6 l- shy l shylJ I shyltt a

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4 lJ 0 I shy

shya 4 ~

W CD

~

~ - r-_

z ~ - - shy

3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

2 If 6 888 8 C C 9 6 t 3 If A C 0 o C 8 8 It 8 8 7 6 6 6 If

2 t 7 9 888 DEE C A A It 8 E F F F 0 C 8 A A A 9 7 7 6 If 2 rshy~

o Z

0

2 5 8 9 ABC 0 E F FED 0 o E 379 A ceo 0 E F G G F G F F- - - - -

If 8 9 9 Ace 0 F F H H H H H

G G G G E 0 B A A A 9 9 8 7 5 G H G F E C A B 8 A 9 8 8 6 5

- r v bull v

H G FEe C A A 9 7 656 5 5

2

E c-

2 6 8 8 A A 8 C E G H I I 3lf5776AE G H I

I I

I I

H F C 8 899 7 6 2 1 If H G C 9 776 2

If

1 3

1 2 1 8 E F G H H GEe 9 5 5 2 gt- - 25 - 3 A C C 0 F E 0 C It A 8 5 5 5 2 -

5 8 8 7 A B 888 A A 9 7 6 3 If 6 6 1 6 9 A 8 8 8 A 8 5 1 2 5 If 1 1 2 7 A 8 B 8 8 5 2

2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

~7 shy

r-

t- ~~

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lti r shy

~

0 ~

5 shyr-a

~

shyw CD ~ - shygt -

4 shyz fshy -

rshy

-1--shy~ -

I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

75

I 2 2 I 3 J 2

2 + + 3 2 50 2 5 5 At J

I 3 2 I 2 + 5 5 5 2 3 At At At 3 + 5 Igt 5 + 1 1

I 3 5 6 6 7 Igt 8 5 5 3 I 2 3 2 1 2 3 At 6 8 8 8 1 2 Igt 8 8 l 2 I I + J I

25 I 2 2 5 A B A 1 Igt 1 7 1 5 5 6 Igt 5 3 1 2 3 3 1 CO D I I I At 8 A C C 8 8 + 3 I A 8 8 8 A 8 1 5 5 Igt 8 7 7 5 2 2 2 3 6 9 B C E E 0 C 9 8 A 0 0 0 0 8 A 1 Igt 1 1 8 8 7 5 2 ~ 2 At It 6 8 A C E F F F E 0 C C E F E 0 A 9 Igt Igt 7 7 7 7 5 1 ~ 0 Z

a 2 It

It

5

6

6

7

8

8

8

9

B C E F H I H GEE -++-t-j-fmiddot-~ oF-

A B C F H r J I H G

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8

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7

9

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8

7

8

6

6

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7 8 Igt 7 It 5

3

9 A A D G I I r I 4

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2 3 3 + 6 Igt Igt 7 8 9 8 5 2 l 1 9 A A 9 7 5 I

2 3 3 57768A4 A I J 5 9 A 8 1 5

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FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

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FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

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FigA-7 LA map TMF8055

A-9

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FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

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- FigA-9 Washington map TMF4039

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FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

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0 Ol

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1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

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X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

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FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

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bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

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FigA-I3 Washington map TMF4054

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FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

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l-4-204141_

1 1 75 - 3 If If 3 3 1 -

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2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

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X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

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FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

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2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

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FigA-17 Philadelphia map TMFS026

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FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

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FigA-19 Philadelphia map TMF5005

A-21

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A-22

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bullbull11 FigA-21 Boston map TMF3031

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FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

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FigA-23 Boston map TMF3037

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Fig A-25 Boston map TMF3008

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-~

~ -r shy10 shy-- - r-

~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

l-4-20456 L

150

~ ~ ltf 0 U 0 ltf ~ o 0 lLI m ~ ) z

100

NO OF AIRCRAFT

AVERAGED OVER

AVERAGED OVER

IN EACH SCAN

40 sec

120 sec

50

CENTER POINT--X Y =20 -15 nmi RANGE =10 nmi

O - 200 250

~---

Fig17

350300

SCAN NUMBER

~ ~ -~-I-I

Time variation LAI traffic model

400 ~ -I ~ -ItJ

shy

22

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

-1-4-20460 shy

fshy -

-50

~

cshy o Z

E c

50

o

f shy

~

I

2

I

I I

I 1 3 t 3 1 1

1 3 t 6 7 5 3 3 2 5 t 5 7 A A A 9 6 I 6

6 9 8 C 0 C A 6 3 5 7 C C E F E 0 8 9 8 C

2 7 9 C E G G G F 0 0 0 E 5 8 8 o E F G H G E E F F 7 9 Il euro --iH-6 II 6 amp--shy7 8 9 8 8 0 F G H I I I I 5 7 8 8 8 9 8 F H I J J J I 3 I I 3 2 3 C F r J J J

9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

I 5 6 5 2 3 3 2

I

I I I 2 I

I 2 3 2 I 2 2 2 t t 3 2

2 2 3 t ~ 6 r 2 2 2 3 3 5 6 D t I

6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

6 F F E [)-euro-- euro--iHt-amp---tr--6--tr-4 H G F E C C A A 9 7 6 6 6 6 I

I H l 0 8 A987t3t31 H G F C A 66132 G F E C 9 I 232 0 0 C C 8 9 7 2 ~ 5 I

9 8 C C C 8 A 8 7 7 6 t

5 8 A C C C 8 8 A 8 8 6 1

6 7 9 8 C C 8 A 9 8 6 t

1 3 5 6 7 9 8 8 B B 7 6 I

3 I 6 9 B B 9 8 5 3 3 5 7 9 9 9 6 3

1 1 I 3 6 7 6 3 1 I

I ~

-

-

-

-

- -

-100

I I

-50 I

o I I

50

I

taO

X (nmi East 1 Mag)

FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

E

c CJ

7 ~ shyI I shyU ~

ltt ~ -shyw Z I- shy

6 l- shy l shylJ I shyltt a

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W CD

~

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z ~ - - shy

3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

2 If 6 888 8 C C 9 6 t 3 If A C 0 o C 8 8 It 8 8 7 6 6 6 If

2 t 7 9 888 DEE C A A It 8 E F F F 0 C 8 A A A 9 7 7 6 If 2 rshy~

o Z

0

2 5 8 9 ABC 0 E F FED 0 o E 379 A ceo 0 E F G G F G F F- - - - -

If 8 9 9 Ace 0 F F H H H H H

G G G G E 0 B A A A 9 9 8 7 5 G H G F E C A B 8 A 9 8 8 6 5

- r v bull v

H G FEe C A A 9 7 656 5 5

2

E c-

2 6 8 8 A A 8 C E G H I I 3lf5776AE G H I

I I

I I

H F C 8 899 7 6 2 1 If H G C 9 776 2

If

1 3

1 2 1 8 E F G H H GEe 9 5 5 2 gt- - 25 - 3 A C C 0 F E 0 C It A 8 5 5 5 2 -

5 8 8 7 A B 888 A A 9 7 6 3 If 6 6 1 6 9 A 8 8 8 A 8 5 1 2 5 If 1 1 2 7 A 8 B 8 8 5 2

2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

~7 shy

r-

t- ~~

~ ltt a 6 ~ shyu 0 r-I shy

lti r shy

~

0 ~

5 shyr-a

~

shyw CD ~ - shygt -

4 shyz fshy -

rshy

-1--shy~ -

I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

75

I 2 2 I 3 J 2

2 + + 3 2 50 2 5 5 At J

I 3 2 I 2 + 5 5 5 2 3 At At At 3 + 5 Igt 5 + 1 1

I 3 5 6 6 7 Igt 8 5 5 3 I 2 3 2 1 2 3 At 6 8 8 8 1 2 Igt 8 8 l 2 I I + J I

25 I 2 2 5 A B A 1 Igt 1 7 1 5 5 6 Igt 5 3 1 2 3 3 1 CO D I I I At 8 A C C 8 8 + 3 I A 8 8 8 A 8 1 5 5 Igt 8 7 7 5 2 2 2 3 6 9 B C E E 0 C 9 8 A 0 0 0 0 8 A 1 Igt 1 1 8 8 7 5 2 ~ 2 At It 6 8 A C E F F F E 0 C C E F E 0 A 9 Igt Igt 7 7 7 7 5 1 ~ 0 Z

a 2 It

It

5

6

6

7

8

8

8

9

B C E F H I H GEE -++-t-j-fmiddot-~ oF-

A B C F H r J I H G

F FEe 8 9-9- f Dell a 8 9

8

II

7

9

1

8

7

8

6

6

5

5

It

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I

e c gt- -25

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7 8 Igt 7 It 5

3

9 A A D G I I r I 4

7 8 9 9 0 G H H 11

66669CE G 2 + At + 7 9 A A C 0

G E C 1 G E f A

E 0 9F

E DCA

Il 1 II 9

9 I

J

8

I

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9

5

I

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8 6 J It

7 7 5

5

Igt tl

5 5

5 5 + 3

3 3 2 2

I 3 + 5 1 9 9 9 8 A II A A II A 9 7 5 5 5 + I I I 3 + 5 7 8 8 9 8 r 889 A A ~ 8 8 7 5 1

2 3 3 + 6 Igt Igt 7 8 9 8 5 2 l 1 9 A A 9 7 5 I

2 3 3 57768A4 A I J 5 9 A 8 1 5

-50 2 3 I

3 5 2

Igt 5 1

7 Igt

7 5 5

7 1

Igt

9 9

8

A 4

9

A

B

Igt 9

8

1

8

5

1 J 5

J J b

If

6 b

(I A II

7 9

A II

9

9 7

9 7 t

6 1

I + 5 5 Igt 7 II 8 7 7 b b 7 Igt It

I J J I b b i) b b b 5 J -75 1 3 + 5 I 1

I I 2

~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

-

7 CENTERPOINT -20 nmi -5 nmi -

6 - -rshylL

r shy _

lt -0 U 0 5 - -lt

lL _ r-

o -0 W 4 - -CD ~ ~ r-

z -

shy--

2 fshy -- -

rshy -

1-shyI--~-

-

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

Ishy

~-

t -75

-50

25

gt- -25

r-o 0 z

E c

1

1 1 2

A bull amp

1

2 2 2 1 If

2

2 2 2 2 4f

If bull

2

1

3 2 4f

5 1 V

4f

3

1 2 2 5 5 1 8 A V

6 If 2

1 2 1 1 3 3 2 2 1 7 3 2 2 2 2 5 6 6 5 3 1 6 7 7 3 2 3 2 2 1 6 8 9 9 8 4f 1 6 6 7 3 5 4f 4f 4f 1 1 7 9 B B A 8 poundf 2 3 At 9 7 8 8 8 6 6 At 4f 5 6 7 8 A C 0 C B 9 8 A A C 0 C 8 B 9 8 1 1 1 1 8 9 B C 0 0 0 0 C C 0 E E E o D B A 9 8 1 1 1 9 A C E F F E 0 E E F F E E 0 C 8 A 8 1 6 6 A - - shy - r _ A

V V V V

1 8 B E F G G G G G o C C B B 8 A 9 1 5 3 3 5 6 8 C F G G H H H G F 0 C 8 8 A 9 1 At 2 1 3 If 5 9 0 F G H H I H G F C C 8 9 8 6 3 2 L 3 6 A C E F Ii H H G E C 8 A 9 1 6 3

2 2 It 7 9 8 C 0 E F F 0 C B A 9 9 7 6 1 2 3 If 6 7 7 8 9 C C B A A B A A 8 7 5

1 2 If 5 6 6 7 7 8 8 9 9 A A 8 8 A 9 5 1 1 2 5 5 6 6 6 7 7 7 1 9 A 8 8 B 8 3

3 It If It At At If 5 5 6 8 A A A 9 3 1 2 2 2 2 1 2 3 t 6 8 A A 8 t

2 t 6 9 8 A 8 5 1 I 3 3 3 8 9 9 A 7 At

I 1 3 It t 1 1 8 8 3 1 2 3 If 2 1 5 6

I 1 1

7 8 7 7

3

5 6 6

5

2

3 At

4f 3 ~

1

1 1

-

-

-

-

I I I J I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-7 LA map TMF8055

A-9

- -

8 I I r- r J I I I

--4-20467 L ~7 shy

I shy

I- CENTERPOINT -5 nmi -15 nmi _6 ~

f shy

~shy 5 shy

IJ I- shyltX ~

n u I shyn

I shyltX r- r shy

~ ~- shyIJ o

l- f shy0 W CD ~ ~ ~ ~ z 3 - - shy

-rshy

~ f-f- shy2 - shy

-f- shy

~ ~-~ -I shy

- nTh+-_ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

2 3 3 6 1 881 665 6 6 6 6 It 1 1 3 5 6 1 8 9 981 888 8 1 1 6 ~

1 1 1 3 5 8 A 8 8 988 999 9 1 5 3 1 1 3 3 1 1 3 5 6 9 8 C D 989 A A 9 8 5 2 3 3 3 2

25 - 1 3 5 5 2 2 3 6 9 C o U A 9 A A 8 9 6 If 2 3 4f It 3 -1 3 5 5 6 5 1 A C o 0 888 889 6 If It 2

5 6 5 6 A 0 f E 0 C 8 C C 8 9 6 5 5 5 3 1 ~ 2 If 5 5 1 C E F F E o C 8 8 8 9 1 5 5 3 3 2

Lshy~

o z

0 1 1 12236 8 0 F F F E shy bull v

1 1 8 A A C 0 0 o 0

E 0 8 8 A A 1 5 - ~ v v

E C C 9 8 8 If

3 3 If If 2

3 1

2

E c

1 9 A A b B B 8 8 3 1 8 J 9 A A 9 9 A

0 C B 7 6 33 3 2 1 B A 8 6 3 2 3 3 2

gt- -25 - 3 5 6 7 8 9 8 9 9 1 2 5 5 6 1 1 8 8 8

A 9 2 1 5 2 1 2

1 2 2 2 1 3 3 3 2 1 -

5 6 6 5 5 6 7 1 1 6 222 2 3 3 3 2 1 3 5 6 6 6 5 5 5 5 5 If 3 1 122 3 3 2 1 3 5 6 6 5 5 3 If If 2 1 1 2 1 1 2 5 2 1 If 3 3 2 1 122 1

-50 - 1 233 3 2 1 222 1 -223 If 2 1 1 12 3 1 t

2 3 3 1 1 2 1

-75 ~ -

I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

35 ~ shy

I-r-

rshy -~ IJ 30 ~ shylaquo -a r-u shy -a laquo ~- shyIJ 25 l- I- I- shy0 -a - lshyw CD 20 I- shygt ~

-rshyz ~

- -15 - -~ ~ shyrshy

1-shy

r- 0 shy

rshy

-- -05 shy- Ishy

-

mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

~ 1 If 5 6 6 6 9 A B 0 0 0 lt- C B 9 7 5 If

2 3 5 6 6 7 8 A C 0 0 E 0 C B B A 9 7 5 1s ~

2 If If 5 6 7 9 A C 0 E o C 8 A A A 962 ~ o _0 3 5 6 -+-6--amp--e-9--fr~- ~--i---9--8-8 ~ ~ ~ ~ ~

Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

-50 - 332 -shy2 1

-75 1 - shy

1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

~25 shy

Ishy

Ishy~~ 20 shy

0 U Ishy0

r shyltt Ishy

lL ~o I-shylshy

~ Ishyffi 5 shyf-CD

~ gt z

- 0 shy-

05 shy

Ishy

~

h I I I o

10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

~

1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

1 3

1 1 2 2 2

1 3 3 3 3 1 3 2 If If 3 3 2 6 6 6 5 If 3 2

8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

-

--

-

-75 ~

--

-

1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

~

-shyz

10 ~ shy-

05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

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-75 - 2 3 2 1 -

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-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

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Ishy

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laquo IJ

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2 - shy~ -f-

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-

J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

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-75 Ishy

2 2 I I -I

I I I I I I

-100 -75 -50 -25 o 25 50 75 100 bull

x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

I I lr- I I I I

l-4-204771_ 45 I- r- shy

r shy

~ ~ - CENTER POINT 020 nmi ~r-40 - shy-

shy-r-shy

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rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

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1 2 2 2 2 3 3 1 1 3 2 3 2 1

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I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

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n CENTER POINT 0 10

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u 0 0 W (II

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FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

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I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

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ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

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-25 o I

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50

I

75 100

bull x (nmi East Mag)

bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

- r- I r r I I I 1 I

l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

35 ~ -

r-

t 30 laquo 0 U g laquo 25 u 0

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15

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~

~l I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

--

CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

a w OJ ~ gt z

-

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20

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RANGE

40 50

Il (nmil

60

I

70 I

80

I

90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

1 It 5 6 6 7 7 9 A 0 0 2 It 5 6 7 7 7 7 9 A A

2 It 5 II 6 6 5 It 7 8 7 2 It 5 It 3 3 If 3 If If 3 I 2 3 2 2 3 2 1 I I 2 3 2 1 I

1 1

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bull bull

-100 I

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-50 -25 0 25

X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

0 15 ~ - shyw CD E shygt z

-~

~ -r shy10 shy-- - r-

~-~

--

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I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

HIGH DENSITY MODEL

01 02

2 20 04 AIRCRAFTnmi

-20

Cdeg4S

0 (~2 ~

-40 LA 2 -0 c-0 ~

MEAS - TMF 8126 z 002e 004c Z008 AIRCRAFTInmi

~ 20

shy-40 -20 o 20 40

X (nmi East of TMF Ma(J)

FiglB Comparison between LAI traffic model and TMF measurement

23

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

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fshy -

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50

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2

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6 9 8 C 0 C A 6 3 5 7 C C E F E 0 8 9 8 C

2 7 9 C E G G G F 0 0 0 E 5 8 8 o E F G H G E E F F 7 9 Il euro --iH-6 II 6 amp--shy7 8 9 8 8 0 F G H I I I I 5 7 8 8 8 9 8 F H I J J J I 3 I I 3 2 3 C F r J J J

9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

I 5 6 5 2 3 3 2

I

I I I 2 I

I 2 3 2 I 2 2 2 t t 3 2

2 2 3 t ~ 6 r 2 2 2 3 3 5 6 D t I

6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

6 F F E [)-euro-- euro--iHt-amp---tr--6--tr-4 H G F E C C A A 9 7 6 6 6 6 I

I H l 0 8 A987t3t31 H G F C A 66132 G F E C 9 I 232 0 0 C C 8 9 7 2 ~ 5 I

9 8 C C C 8 A 8 7 7 6 t

5 8 A C C C 8 8 A 8 8 6 1

6 7 9 8 C C 8 A 9 8 6 t

1 3 5 6 7 9 8 8 B B 7 6 I

3 I 6 9 B B 9 8 5 3 3 5 7 9 9 9 6 3

1 1 I 3 6 7 6 3 1 I

I ~

-

-

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50

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FigA-l LA map TMF8126

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FigA-2 LA histogram TMF8126

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FigA-3 LA map TMF8122

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FigA-5 LA map TMF8046

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FigA-6 LA histogram TMF8046

A-8

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FigA-7 LA map TMF8055

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FigA-8 LA histogram TMF8055

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FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

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X (nmi East Mag)

Fig A-II Washington map TMF400I

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FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

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X (nmi East Mag)

FigA-I3 Washington map TMF4054

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FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

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l-4-204141_

1 1 75 - 3 If If 3 3 1 -

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2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

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FigA-15 Philadelphia map TMF5I39

A-17

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FigA-16 Philadelphia histogram TMF5I39

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FigA-17 Philadelphia map TMFS026

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FigA-18 Philadelphia histogram TMF5026

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FigA-19 Philadelphia map TMF5005

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-

-rshy

10 -

05 -

o 10 20 30 40 50 60 70 80

rh 90 100

RANGE (nmi)

FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

s shy~

00 2

E c-gt -25

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f r

-

2 2 3 5 5 2

6 5 6 1 3 6 6 1 1 1 5 1 8 If 2 1 1 1 8 9 8 6 6 8 8 If 2 2

1 3 9 9 A 1 7 1 1 1 - 3 3 2 If 5 6 8 8 8 9 8 6 2 If If 3 2

q t II) 6 8 8 9 f T 5 t Cgt 3 1 ~ 1 If 5 T 9 A e a 8 8 6 It 3 5 5 5 5 1 9 8 C C 8 9 8 6

1 3 ~ 5 6 f 6 A C 0 E E A 8 5 1

1 5 7 1 8 ( 9 8 o E F F C 8 2 2 1 ~

ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

1 If 5 8 8 816 8 7 5 3 3 5 6 1 716 1 1 6 3

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-

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-50

I

-25 o I

25

I

50

I

75 100

bull x (nmi East Mag)

bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

- r- I r r I I I 1 I

l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

35 ~ -

r-

t 30 laquo 0 U g laquo 25 u 0

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15

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~

~ --

10 - -shy

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05

- shy - -

~

~l I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

--

CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

a w OJ ~ gt z

-

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25

20

15

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- ~

-

~ -05 -

o 10 20 30

RANGE

40 50

Il (nmil

60

I

70 I

80

I

90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

1 It 5 6 6 7 7 9 A 0 0 2 It 5 6 7 7 7 7 9 A A

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1 1

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If

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-

-

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-75 Ishy -

bull bull

-100 I

-75 I I I

-50 -25 0 25

X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

0 15 ~ - shyw CD E shygt z

-~

~ -r shy10 shy-- - r-

~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

50 DATA VALIDITY

During the course of data reduction efforts a number of checks for validity of the results were made Several of these are discussed here

When the high traffic densities in the Long Beach area data were first observed a question arose as to the qualit of TMF surveillance data under such conditions It was asked whether high-density interference effects such as synchronous garbles phantoms and fruit might be disturbing the ATCRBS-mode data to a degree where these high densities may not be accurately measureab1e This issue was studied by means of X-Y plots of TMF data showing traffic in the high density area The example shown in Fig 19 includes the area from Long Beach through LA International Airport (LAX) This is a plot of the first 50 scans of tape TMF8126 showing target reports which correlate with tracks Landing and takeoff traffic patterns at LAX Long Beach and other airports are clearly evident The quality of the TMF surveillance data is seen to be good and is believed to be quite sufficient for the present purpose

All radar sites have coverage limitations to some degree and these obviously interfere with the ability to measure traffic densities in the affected areas The coverage qualities of the TMF Brea site were investigated in some detail because of the special interest in the LA Basin due to its high traffic concentration and because of the mountainous terrain which may be expected to cause irregular coverage patterns One specific area of interest is in the San Fernando Valley in the vicinity of the Van Nuys and Burbank airports These airports are noted for large numbers of small aircraft Radar sites near LAX do not have good coverage of the San Fernando Valley because of the intervening Santa Monica Mountains However the TMF Brea site appears to be well located in this respect having a relatively unobstructed view (from the southeast) of both sides of these mountains While the TMF was at Brea flight tests were conducted to measure low altitude coverage at a number of airports including those in the San Fernando Valley Results are summarized in Table 1 These results confirm the original expectation that Brea is a good site with widespread coverage throughout the LA Basin

This study attempts to focus on the airborne environment and thus be independent to the greatest extent possible of ground conditions such as parameters of the sensor and the precise location of the sensor If this 1

independence is achieved then it should be possible to compare traffic density data recorded by two different sensors such as TMF and ARTS-III with slightly different sites and find reasonable agreement ARTS vs TMF comparisons were carried out in two cases one with the TMFDeer Island comshypared with the ARTS at Boston Logan Airport and the other between TMF and ARTS both located at Washington National Airport In both cases simultaneous recordings were used as inputs to the traffic density analysis program The results shown as traffic density maps are given in Figs 20 and 21 Spatial distributions and absolute densities compare favorably with ARTS showing slightly less traffic in both cases This minor difference is probably attributable to the improvement in track reliabi1ities of TMF data relative to ARTS (Ref 4)

24

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

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9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

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6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

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I ~

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FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

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Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

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3 - shy

r-shy~2 - shy

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~r-~

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shy ~ o 10 20 30 40 50 60 70 80 90 100

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FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

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0

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2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

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- ~I o 10 20 30 40 50 60 70 80 90 100

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FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

75

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I J J I b b i) b b b 5 J -75 1 3 + 5 I 1

I I 2

~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

-

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6 - -rshylL

r shy _

lt -0 U 0 5 - -lt

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z -

shy--

2 fshy -- -

rshy -

1-shyI--~-

-

o 10 20 30 40 50 60 70 80 90 100

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FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

Ishy

~-

t -75

-50

25

gt- -25

r-o 0 z

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X (nmi East Mag)

FigA-7 LA map TMF8055

A-9

- -

8 I I r- r J I I I

--4-20467 L ~7 shy

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I- CENTERPOINT -5 nmi -15 nmi _6 ~

f shy

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-rshy

~ f-f- shy2 - shy

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~ ~-~ -I shy

- nTh+-_ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

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25 - 1 3 5 5 2 2 3 6 9 C o U A 9 A A 8 9 6 If 2 3 4f It 3 -1 3 5 5 6 5 1 A C o 0 888 889 6 If It 2

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5 6 6 5 5 6 7 1 1 6 222 2 3 3 3 2 1 3 5 6 6 6 5 5 5 5 5 If 3 1 122 3 3 2 1 3 5 6 6 5 5 3 If If 2 1 1 2 1 1 2 5 2 1 If 3 3 2 1 122 1

-50 - 1 233 3 2 1 222 1 -223 If 2 1 1 12 3 1 t

2 3 3 1 1 2 1

-75 ~ -

I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

35 ~ shy

I-r-

rshy -~ IJ 30 ~ shylaquo -a r-u shy -a laquo ~- shyIJ 25 l- I- I- shy0 -a - lshyw CD 20 I- shygt ~

-rshyz ~

- -15 - -~ ~ shyrshy

1-shy

r- 0 shy

rshy

-- -05 shy- Ishy

-

mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

~ 1 If 5 6 6 6 9 A B 0 0 0 lt- C B 9 7 5 If

2 3 5 6 6 7 8 A C 0 0 E 0 C B B A 9 7 5 1s ~

2 If If 5 6 7 9 A C 0 E o C 8 A A A 962 ~ o _0 3 5 6 -+-6--amp--e-9--fr~- ~--i---9--8-8 ~ ~ ~ ~ ~

Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

-50 - 332 -shy2 1

-75 1 - shy

1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

~25 shy

Ishy

Ishy~~ 20 shy

0 U Ishy0

r shyltt Ishy

lL ~o I-shylshy

~ Ishyffi 5 shyf-CD

~ gt z

- 0 shy-

05 shy

Ishy

~

h I I I o

10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

~

1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

1 3

1 1 2 2 2

1 3 3 3 3 1 3 2 If If 3 3 2 6 6 6 5 If 3 2

8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

-

--

-

-75 ~

--

-

1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

~

-shyz

10 ~ shy-

05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

0 --

3 5

- shy6 5 5

6

7

7

-9

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A

n

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n

8

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9

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8 0

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8 9 9

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2 2

2

2

2

2

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1 1 If 5 7 9 8 C 8 8 9 9 C C 8 A 7 3 1 1 gtshy -25 ~ 1 1 2 7 A C C C 8 A A 9 8 8 9 6 -

2 3 3 3 If 6 A C C C A A 9 9 9 9 5 2 3 If 5 5 6 9 8 8 A 8 8 8 9 7 If

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-50 ~ If 5 6 5 2 3 5 6 8 7 7 3 -2 If If 2 5 7 8 7 6

1 3 6 T 7 6 If

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2 If 5 5 If 2

-75 - 2 3 2 1 -

I I ~J I 1 I i I I A shy

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

-- -

Ishy

-4 shy- shy

IJ shylaquo 0 I- shyu ~ 0

laquo IJ

3 - shy~ 0 f- shy-0 - l- I-- IshyIJJ shyCD - E I-lshygt shyz

2 - shy~ -f-

-fshy -

~ shy

I- shy

-

J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

Lshy ~

o Z

0

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5 5

l

6 5

1

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1

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f

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3

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3 6 7 7 7 7 9 A B B 8 A 7 6 7 A A 9 7 5 3 1 f 6 6 6 8 9 A A A 9 6 If If 7 9 9 8 6 3

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I I 2 3 1 2 1 I 3 3 2 1

-75 Ishy

2 2 I I -I

I I I I I I

-100 -75 -50 -25 o 25 50 75 100 bull

x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

I I lr- I I I I

l-4-204771_ 45 I- r- shy

r shy

~ ~ - CENTER POINT 020 nmi ~r-40 - shy-

shy-r-shy

rshy35 - r- shy

r- _rshy -~ ~ 30 ~ - - shyoCt

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0 ~

0 r- shyr-W

m 20 shyE - - shygt z

- r-- shy15 r- shy-

I shy

10 - - shyI shy

-rshy-r shy

05 - - shy

- ~

rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

3 pound+ It 6 8 8 8 1 e 5 3 1 5 1 1 8 8 6 pound+

2 3 pound+ 5 7 8 8 8 1 6 5 5 5 6 6 6 6 8 I 8 6 2 50 ~ 2 3 5 8 lt) lt) lt) 8 6 2 3 5 7 7 6 6 7 8 lt) lt) 8 5 3 -

2 3 5 8 lt) A lt) 7 6 pound+ 1 8 8 1 5 7 8 8 lt) lt) 1 6 3 ~ 3 5 6 7 7 lt) lt) A A 7 5 3 1 6 8 lt) 7 5 3 5 8 lt) lt) lt) 7 3

1 pound+ 6 1 8 S lt) A lt) A 7 5 pound+ 1 3 lt) lt) 8 3 3 3 5 8 9 9 9 6 5 2 3 6 8 9 lt) lt) lt) lt) 8 lt) 8 lt) 8 6 1 A A lt) 6 7 1 8 9 lt) lt) 7 5 pound+ 2 1

0 0

25 ~ pound+

pound+

6 5

8 7

8 8

9 8

lt)

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lt)

lt)

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A A lt) 8 8 A A lt)

8 lt) A A A 8 A A B 8 A 8

6 5

If

1 2 3

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Of

5

5 5 I

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lt)

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8 8 8

6 1 8

6 6 6

6 5 3

5 2 3

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1

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2 5 6 6 1 2 5 6 7 8 8 8 1 6 5 6 8 8 1 1 5 It 3 1 1 5 6 6 6 6 6 6 6 5 If 1 1 8 6 5 3 1

3 6 1 1 6 5 2 2 pound+ If If 5 1 1 6 It 2 1 1 5 7 1 6 6 3 2 If 5 6 6 It

-50 - 1 pound+ 6 1 5 3 1 1 3 If If If 3 -3 If 5 1 2 2 2 If If 3

1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

~ u lt 0 U 0 lt

u 0 0 W (II

~ ~ Z

30

25

20

15

-

-

-

-

-rshy

10 -

05 -

o 10 20 30 40 50 60 70 80

rh 90 100

RANGE (nmi)

FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

s shy~

00 2

E c-gt -25

-50

f r

-

2 2 3 5 5 2

6 5 6 1 3 6 6 1 1 1 5 1 8 If 2 1 1 1 8 9 8 6 6 8 8 If 2 2

1 3 9 9 A 1 7 1 1 1 - 3 3 2 If 5 6 8 8 8 9 8 6 2 If If 3 2

q t II) 6 8 8 9 f T 5 t Cgt 3 1 ~ 1 If 5 T 9 A e a 8 8 6 It 3 5 5 5 5 1 9 8 C C 8 9 8 6

1 3 ~ 5 6 f 6 A C 0 E E A 8 5 1

1 5 7 1 8 ( 9 8 o E F F C 8 2 2 1 ~

ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

1 If 5 8 8 816 8 7 5 3 3 5 6 1 716 1 1 6 3

1 3 1 1 8 IJ 8 1 5 If 1 1 5 8 8 8 6 5 2 1

3 0 7 16 If 3 i If b If

1 1

-

-

-

-

-

-75 - -

-100 I I

-75 I I

-50

I

-25 o I

25

I

50

I

75 100

bull x (nmi East Mag)

bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

- r- I r r I I I 1 I

l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

35 ~ -

r-

t 30 laquo 0 U g laquo 25 u 0

0 W CD 20 ~ gt z

15

~ ~ -

~ - -- -~ -shy

~-- -_rshy - ~

-- ~ ~

~

~ --

10 - -shy

~ -

05

- shy - -

~

~l I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

--

CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

a w OJ ~ gt z

-

-

~

25

20

15

- -

-- -shy -

-shyrshy

~

~

I shy -shy -

-I

-

-

shy

~ ~10

~

- ~

-

~ -05 -

o 10 20 30

RANGE

40 50

Il (nmil

60

I

70 I

80

I

90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

1 It 5 6 6 7 7 9 A 0 0 2 It 5 6 7 7 7 7 9 A A

2 It 5 II 6 6 5 It 7 8 7 2 It 5 It 3 3 If 3 If If 3 I 2 3 2 2 3 2 1 I I 2 3 2 1 I

1 1

2 3 ~

It 5 6 5 6 6 6 t 5 6 5 5 It 3 7 J

If

7 3 8 3 - A

It 5 5 5 3 I

2 3 ~

2

-

-

-

-50 Ishy -

-75 Ishy -

bull bull

-100 I

-75 I I I

-50 -25 0 25

X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

0 15 ~ - shyw CD E shygt z

-~

~ -r shy10 shy-- - r-

~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

C42-1618 TAPE TMF 8126

o__--------Ir-------------------r---cbullT------------- i

J ~-~ 1 ~bullbullbull I ULLfRTOH~rEgt j

LAX bull bullbullbull1 0 (~ 0 = COMPTON lt

HAWTHOIHE ~ ~ J- 0 )u f t bull ~

I

~ ~ y I shy lL 10 0

I I shy

0ac ) Z ~-~

01

~ Z gt-

TOR ANCEmiddot~ middotmiddott ~ _bull ~- - - ~ -r

15 ~l~--------~F=bull-bull~rr +-bullbull~ OO= =~-----tr=~ --------~~1---- - ~ --r~rr==lr== bullbull= bull====== r-( r r bull 1-

1 middot1middotmiddotmiddotmiddot1

( ~ll

~ bull bullbullbull t- ~ zoL--------middotmiddotmiddot-----------J---------~JI~O----------- 10----------0

-z middotzomiddot -

X (NMI EAST OF TMF MAG)

Fig19 X-y plot of aircraft tracks (LA Basin)

t

25

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

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24 May 76

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TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

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FigA-12 Washington histogram TMF4001

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FigA-14 Washington histogram TMF4054

A-16

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3 6 1 1 6 5 2 2 pound+ If If 5 1 1 6 It 2 1 1 5 7 1 6 6 3 2 If 5 6 6 It

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1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

~ u lt 0 U 0 lt

u 0 0 W (II

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30

25

20

15

-

-

-

-

-rshy

10 -

05 -

o 10 20 30 40 50 60 70 80

rh 90 100

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FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

s shy~

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ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

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75 100

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bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

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r-

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~l I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

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z ~ _- po vI o 0 ~ v v v ~ ~

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-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

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CENTER POINT -5 omi 0 -

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40 50

Il (nmil

60

I

70 I

80

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bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

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2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

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-

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-100 I

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X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

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l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

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~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

TABLE 1 MEASURED COVERAGE AT LA BASIN AIRPORTS

Aircraft Altitude~ Lower Limit of Surveillance Coverage

Airport Airport (Ft Above Ground Level) Elevation

(Ft Above MSL) During During Landing Takeoff

Burbank 775 a 300

Brackett Field 1000 a a Chino 652 100 100

El Monte 296 a a Fullerton 96 a a Hawthorne 63 a a Long Beach 57 100 100

Los Angeles 126 a 100 IntI

Ontario 952 a a Orange County 54 a a Santa Monica 175 200 400

Torrance 101 0 0

Van Nuys 800 400 300

I

26

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

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6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

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A-3

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10 I I I I I T I I1 l-4-20461 L

9 shy-1-

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FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

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1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

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2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

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FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

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- ~I o 10 20 30 40 50 60 70 80 90 100

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FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

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I I 2

~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

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z -

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2 fshy -- -

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1-shyI--~-

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FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

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t -75

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25

gt- -25

r-o 0 z

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V V V V

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FigA-7 LA map TMF8055

A-9

- -

8 I I r- r J I I I

--4-20467 L ~7 shy

I shy

I- CENTERPOINT -5 nmi -15 nmi _6 ~

f shy

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-rshy

~ f-f- shy2 - shy

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~ ~-~ -I shy

- nTh+-_ o 10 20 30 40 50 60 70 80 90 100

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FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

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A 9 2 1 5 2 1 2

1 2 2 2 1 3 3 3 2 1 -

5 6 6 5 5 6 7 1 1 6 222 2 3 3 3 2 1 3 5 6 6 6 5 5 5 5 5 If 3 1 122 3 3 2 1 3 5 6 6 5 5 3 If If 2 1 1 2 1 1 2 5 2 1 If 3 3 2 1 122 1

-50 - 1 233 3 2 1 222 1 -223 If 2 1 1 12 3 1 t

2 3 3 1 1 2 1

-75 ~ -

I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

35 ~ shy

I-r-

rshy -~ IJ 30 ~ shylaquo -a r-u shy -a laquo ~- shyIJ 25 l- I- I- shy0 -a - lshyw CD 20 I- shygt ~

-rshyz ~

- -15 - -~ ~ shyrshy

1-shy

r- 0 shy

rshy

-- -05 shy- Ishy

-

mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

~ 1 If 5 6 6 6 9 A B 0 0 0 lt- C B 9 7 5 If

2 3 5 6 6 7 8 A C 0 0 E 0 C B B A 9 7 5 1s ~

2 If If 5 6 7 9 A C 0 E o C 8 A A A 962 ~ o _0 3 5 6 -+-6--amp--e-9--fr~- ~--i---9--8-8 ~ ~ ~ ~ ~

Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

-50 - 332 -shy2 1

-75 1 - shy

1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

~25 shy

Ishy

Ishy~~ 20 shy

0 U Ishy0

r shyltt Ishy

lL ~o I-shylshy

~ Ishyffi 5 shyf-CD

~ gt z

- 0 shy-

05 shy

Ishy

~

h I I I o

10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

~

1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

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1 1 2 2 2

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8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

-

--

-

-75 ~

--

-

1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

~

-shyz

10 ~ shy-

05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

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1 1 If 5 7 9 8 C 8 8 9 9 C C 8 A 7 3 1 1 gtshy -25 ~ 1 1 2 7 A C C C 8 A A 9 8 8 9 6 -

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-75 - 2 3 2 1 -

I I ~J I 1 I i I I A shy

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

-- -

Ishy

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laquo IJ

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2 - shy~ -f-

-fshy -

~ shy

I- shy

-

J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

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3 6 7 7 7 7 9 A B B 8 A 7 6 7 A A 9 7 5 3 1 f 6 6 6 8 9 A A A 9 6 If If 7 9 9 8 6 3

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I I 2 3 1 2 1 I 3 3 2 1

-75 Ishy

2 2 I I -I

I I I I I I

-100 -75 -50 -25 o 25 50 75 100 bull

x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

I I lr- I I I I

l-4-204771_ 45 I- r- shy

r shy

~ ~ - CENTER POINT 020 nmi ~r-40 - shy-

shy-r-shy

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-rshy-r shy

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rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

3 pound+ It 6 8 8 8 1 e 5 3 1 5 1 1 8 8 6 pound+

2 3 pound+ 5 7 8 8 8 1 6 5 5 5 6 6 6 6 8 I 8 6 2 50 ~ 2 3 5 8 lt) lt) lt) 8 6 2 3 5 7 7 6 6 7 8 lt) lt) 8 5 3 -

2 3 5 8 lt) A lt) 7 6 pound+ 1 8 8 1 5 7 8 8 lt) lt) 1 6 3 ~ 3 5 6 7 7 lt) lt) A A 7 5 3 1 6 8 lt) 7 5 3 5 8 lt) lt) lt) 7 3

1 pound+ 6 1 8 S lt) A lt) A 7 5 pound+ 1 3 lt) lt) 8 3 3 3 5 8 9 9 9 6 5 2 3 6 8 9 lt) lt) lt) lt) 8 lt) 8 lt) 8 6 1 A A lt) 6 7 1 8 9 lt) lt) 7 5 pound+ 2 1

0 0

25 ~ pound+

pound+

6 5

8 7

8 8

9 8

lt)

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lt)

lt)

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6 5

If

1 2 3

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Of

5

5 5 I

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2 5 6 6 1 2 5 6 7 8 8 8 1 6 5 6 8 8 1 1 5 It 3 1 1 5 6 6 6 6 6 6 6 5 If 1 1 8 6 5 3 1

3 6 1 1 6 5 2 2 pound+ If If 5 1 1 6 It 2 1 1 5 7 1 6 6 3 2 If 5 6 6 It

-50 - 1 pound+ 6 1 5 3 1 1 3 If If If 3 -3 If 5 1 2 2 2 If If 3

1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

~ u lt 0 U 0 lt

u 0 0 W (II

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30

25

20

15

-

-

-

-

-rshy

10 -

05 -

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rh 90 100

RANGE (nmi)

FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

s shy~

00 2

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f r

-

2 2 3 5 5 2

6 5 6 1 3 6 6 1 1 1 5 1 8 If 2 1 1 1 8 9 8 6 6 8 8 If 2 2

1 3 9 9 A 1 7 1 1 1 - 3 3 2 If 5 6 8 8 8 9 8 6 2 If If 3 2

q t II) 6 8 8 9 f T 5 t Cgt 3 1 ~ 1 If 5 T 9 A e a 8 8 6 It 3 5 5 5 5 1 9 8 C C 8 9 8 6

1 3 ~ 5 6 f 6 A C 0 E E A 8 5 1

1 5 7 1 8 ( 9 8 o E F F C 8 2 2 1 ~

ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

1 If 5 8 8 816 8 7 5 3 3 5 6 1 716 1 1 6 3

1 3 1 1 8 IJ 8 1 5 If 1 1 5 8 8 8 6 5 2 1

3 0 7 16 If 3 i If b If

1 1

-

-

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-75 - -

-100 I I

-75 I I

-50

I

-25 o I

25

I

50

I

75 100

bull x (nmi East Mag)

bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

- r- I r r I I I 1 I

l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

35 ~ -

r-

t 30 laquo 0 U g laquo 25 u 0

0 W CD 20 ~ gt z

15

~ ~ -

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~

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10 - -shy

~ -

05

- shy - -

~

~l I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

--

CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

a w OJ ~ gt z

-

-

~

25

20

15

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-- -shy -

-shyrshy

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~

- ~

-

~ -05 -

o 10 20 30

RANGE

40 50

Il (nmil

60

I

70 I

80

I

90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

1 It 5 6 6 7 7 9 A 0 0 2 It 5 6 7 7 7 7 9 A A

2 It 5 II 6 6 5 It 7 8 7 2 It 5 It 3 3 If 3 If If 3 I 2 3 2 2 3 2 1 I I 2 3 2 1 I

1 1

2 3 ~

It 5 6 5 6 6 6 t 5 6 5 5 It 3 7 J

If

7 3 8 3 - A

It 5 5 5 3 I

2 3 ~

2

-

-

-

-50 Ishy -

-75 Ishy -

bull bull

-100 I

-75 I I I

-50 -25 0 25

X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

0 15 ~ - shyw CD E shygt z

-~

~ -r shy10 shy-- - r-

~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

60 0028

AIRCRAFT

PER nmi 2

N

r 2

1pound-~

0 z e c-~

20

-20

-40 l18-4- 20451 L

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East M09) x (nmi East MOCJl

Fig20 Comparison between TMF density data - Washington DC

and ARTS as the source of traffic

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

-1-4-20460 shy

fshy -

-50

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cshy o Z

E c

50

o

f shy

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2

I

I I

I 1 3 t 3 1 1

1 3 t 6 7 5 3 3 2 5 t 5 7 A A A 9 6 I 6

6 9 8 C 0 C A 6 3 5 7 C C E F E 0 8 9 8 C

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FigA-l LA map TMF8126

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FigA-2 LA histogram TMF8126

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100 I I I I l-4-204621_

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FigA-3 LA map TMF8122

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FigA-5 LA map TMF8046

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FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

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FigA-7 LA map TMF8055

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FigA-8 LA histogram TMF8055

A-10

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- FigA-9 Washington map TMF4039

A-II

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FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

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2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

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0 Ol

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Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

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X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

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FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

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bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

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X (nmi East Mag)

FigA-I3 Washington map TMF4054

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FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

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1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

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X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

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FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

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2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

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FigA-17 Philadelphia map TMFS026

A-19

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FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

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2 5 6 6 1 2 5 6 7 8 8 8 1 6 5 6 8 8 1 1 5 It 3 1 1 5 6 6 6 6 6 6 6 5 If 1 1 8 6 5 3 1

3 6 1 1 6 5 2 2 pound+ If If 5 1 1 6 It 2 1 1 5 7 1 6 6 3 2 If 5 6 6 It

-50 - 1 pound+ 6 1 5 3 1 1 3 If If If 3 -3 If 5 1 2 2 2 If If 3

1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

~ u lt 0 U 0 lt

u 0 0 W (II

~ ~ Z

30

25

20

15

-

-

-

-

-rshy

10 -

05 -

o 10 20 30 40 50 60 70 80

rh 90 100

RANGE (nmi)

FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

s shy~

00 2

E c-gt -25

-50

f r

-

2 2 3 5 5 2

6 5 6 1 3 6 6 1 1 1 5 1 8 If 2 1 1 1 8 9 8 6 6 8 8 If 2 2

1 3 9 9 A 1 7 1 1 1 - 3 3 2 If 5 6 8 8 8 9 8 6 2 If If 3 2

q t II) 6 8 8 9 f T 5 t Cgt 3 1 ~ 1 If 5 T 9 A e a 8 8 6 It 3 5 5 5 5 1 9 8 C C 8 9 8 6

1 3 ~ 5 6 f 6 A C 0 E E A 8 5 1

1 5 7 1 8 ( 9 8 o E F F C 8 2 2 1 ~

ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

1 If 5 8 8 816 8 7 5 3 3 5 6 1 716 1 1 6 3

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1 1

-

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-75 - -

-100 I I

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-50

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-25 o I

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50

I

75 100

bull x (nmi East Mag)

bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

- r- I r r I I I 1 I

l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

35 ~ -

r-

t 30 laquo 0 U g laquo 25 u 0

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~

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10 - -shy

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05

- shy - -

~

~l I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

--

CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

a w OJ ~ gt z

-

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25

20

15

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~

- ~

-

~ -05 -

o 10 20 30

RANGE

40 50

Il (nmil

60

I

70 I

80

I

90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

1 It 5 6 6 7 7 9 A 0 0 2 It 5 6 7 7 7 7 9 A A

2 It 5 II 6 6 5 It 7 8 7 2 It 5 It 3 3 If 3 If If 3 I 2 3 2 2 3 2 1 I I 2 3 2 1 I

1 1

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If

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2

-

-

-

-50 Ishy -

-75 Ishy -

bull bull

-100 I

-75 I I I

-50 -25 0 25

X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

0 15 ~ - shyw CD E shygt z

-~

~ -r shy10 shy-- - r-

~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

60 l18 -4-20459 L

01 o 0005 ~ Sshy I t 001 o z

e 002 ~

N exgt

c PEAK 0026 gtshy -20

AIRCRAFT PER

nmi 2

-40

(0 )

TMF 3037 -60 I I I I I I I I I I I

-40 -20 o 20 40 -40 -20 o 20 40

x (nmi East MaQ) x (nmi East MaQl

Fig21 Comparison between TMF and ARTS as the source of traffic data - Boston

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

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fshy -

-50

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cshy o Z

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50

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6 9 8 C 0 C A 6 3 5 7 C C E F E 0 8 9 8 C

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9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

I 5 6 5 2 3 3 2

I

I I I 2 I

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6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

6 F F E [)-euro-- euro--iHt-amp---tr--6--tr-4 H G F E C C A A 9 7 6 6 6 6 I

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9 8 C C C 8 A 8 7 7 6 t

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1 3 5 6 7 9 8 8 B B 7 6 I

3 I 6 9 B B 9 8 5 3 3 5 7 9 9 9 6 3

1 1 I 3 6 7 6 3 1 I

I ~

-

-

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-100

I I

-50 I

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50

I

taO

X (nmi East 1 Mag)

FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

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3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

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FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

2 If 6 888 8 C C 9 6 t 3 If A C 0 o C 8 8 It 8 8 7 6 6 6 If

2 t 7 9 888 DEE C A A It 8 E F F F 0 C 8 A A A 9 7 7 6 If 2 rshy~

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0

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2

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2 6 8 8 A A 8 C E G H I I 3lf5776AE G H I

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2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

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r-

t- ~~

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rshy

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I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

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FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

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I 2 2 I 3 J 2

2 + + 3 2 50 2 5 5 At J

I 3 2 I 2 + 5 5 5 2 3 At At At 3 + 5 Igt 5 + 1 1

I 3 5 6 6 7 Igt 8 5 5 3 I 2 3 2 1 2 3 At 6 8 8 8 1 2 Igt 8 8 l 2 I I + J I

25 I 2 2 5 A B A 1 Igt 1 7 1 5 5 6 Igt 5 3 1 2 3 3 1 CO D I I I At 8 A C C 8 8 + 3 I A 8 8 8 A 8 1 5 5 Igt 8 7 7 5 2 2 2 3 6 9 B C E E 0 C 9 8 A 0 0 0 0 8 A 1 Igt 1 1 8 8 7 5 2 ~ 2 At It 6 8 A C E F F F E 0 C C E F E 0 A 9 Igt Igt 7 7 7 7 5 1 ~ 0 Z

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I J J I b b i) b b b 5 J -75 1 3 + 5 I 1

I I 2

~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

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r shy _

lt -0 U 0 5 - -lt

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z -

shy--

2 fshy -- -

rshy -

1-shyI--~-

-

o 10 20 30 40 50 60 70 80 90 100

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FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

Ishy

~-

t -75

-50

25

gt- -25

r-o 0 z

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1 1 2

A bull amp

1

2 2 2 1 If

2

2 2 2 2 4f

If bull

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1

3 2 4f

5 1 V

4f

3

1 2 2 5 5 1 8 A V

6 If 2

1 2 1 1 3 3 2 2 1 7 3 2 2 2 2 5 6 6 5 3 1 6 7 7 3 2 3 2 2 1 6 8 9 9 8 4f 1 6 6 7 3 5 4f 4f 4f 1 1 7 9 B B A 8 poundf 2 3 At 9 7 8 8 8 6 6 At 4f 5 6 7 8 A C 0 C B 9 8 A A C 0 C 8 B 9 8 1 1 1 1 8 9 B C 0 0 0 0 C C 0 E E E o D B A 9 8 1 1 1 9 A C E F F E 0 E E F F E E 0 C 8 A 8 1 6 6 A - - shy - r _ A

V V V V

1 8 B E F G G G G G o C C B B 8 A 9 1 5 3 3 5 6 8 C F G G H H H G F 0 C 8 8 A 9 1 At 2 1 3 If 5 9 0 F G H H I H G F C C 8 9 8 6 3 2 L 3 6 A C E F Ii H H G E C 8 A 9 1 6 3

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1 2 If 5 6 6 7 7 8 8 9 9 A A 8 8 A 9 5 1 1 2 5 5 6 6 6 7 7 7 1 9 A 8 8 B 8 3

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4f 3 ~

1

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I I I J I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-7 LA map TMF8055

A-9

- -

8 I I r- r J I I I

--4-20467 L ~7 shy

I shy

I- CENTERPOINT -5 nmi -15 nmi _6 ~

f shy

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-rshy

~ f-f- shy2 - shy

-f- shy

~ ~-~ -I shy

- nTh+-_ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

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25 - 1 3 5 5 2 2 3 6 9 C o U A 9 A A 8 9 6 If 2 3 4f It 3 -1 3 5 5 6 5 1 A C o 0 888 889 6 If It 2

5 6 5 6 A 0 f E 0 C 8 C C 8 9 6 5 5 5 3 1 ~ 2 If 5 5 1 C E F F E o C 8 8 8 9 1 5 5 3 3 2

Lshy~

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E C C 9 8 8 If

3 3 If If 2

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gt- -25 - 3 5 6 7 8 9 8 9 9 1 2 5 5 6 1 1 8 8 8

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2 3 3 1 1 2 1

-75 ~ -

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-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

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1-shy

r- 0 shy

rshy

-- -05 shy- Ishy

-

mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

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0 Ol

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Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

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-75 1 - shy

1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

~25 shy

Ishy

Ishy~~ 20 shy

0 U Ishy0

r shyltt Ishy

lL ~o I-shylshy

~ Ishyffi 5 shyf-CD

~ gt z

- 0 shy-

05 shy

Ishy

~

h I I I o

10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

~

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bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

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5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

-

--

-

-75 ~

--

-

1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

~

-shyz

10 ~ shy-

05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

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1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

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-100 -75 -50 -25 o 25 50 75 100

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FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

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Ishy

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J 1n o 10 20 30 40 50 60 70 80 90 100

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FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

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50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

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-100 -75 -50 -25 o 25 50 75 100 bull

x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

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l-4-204771_ 45 I- r- shy

r shy

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shy-r-shy

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rh- o 10 20 30 40 50 60 70 80 90 100

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FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

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0 0

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1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

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n CENTER POINT 0 10

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FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

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-1-4-20480 _

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r 50

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bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

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l-4-20481 L_ -

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r-

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o 10 20 30 40 50 60 70 80 90 100

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FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

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z ~ _- po vI o 0 ~ v v v ~ ~

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-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

--

CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

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40 50

Il (nmil

60

I

70 I

80

I

90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

1 It 5 6 6 7 7 9 A 0 0 2 It 5 6 7 7 7 7 9 A A

2 It 5 II 6 6 5 It 7 8 7 2 It 5 It 3 3 If 3 If If 3 I 2 3 2 2 3 2 1 I I 2 3 2 1 I

1 1

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If

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-

-

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-75 Ishy -

bull bull

-100 I

-75 I I I

-50 -25 0 25

X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

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l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

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~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

60 SUMMARY

Air traffic measurements in LA Washington Philadelphia and Boston have shown that traffic density is the highest in LA The time and spatial average density over a circular region of 10 nmi radius reaches a peak value of 01 aircraftsq nmi in LA Under comparable conditions the densities in Washington Philadelphia and Boston reach 002 to 004 aircraftsq nmi These measureshyments include only ATCRBS-transponder equipped aircraft

These are peak densities which do not extend over large areas Examinashytion of the range distribution of aircraft relative to the point of highest density indicates that the region of constant density extends to a radius of about 10 to 15 nmi Beyond that the range distribution is better described as uniform-in-range with a coefficient of about 3 aircraftnmi in the case of LA

These measurements made in 1976 were compared with the LAl Standard Traffic Model as to spatial distribution of traffic and absolute density The results show that the model and the measurement differ by a scale factor of 51 (with density being greater in the model) but otherwise agree closely in spatial distribution

29

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

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50

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9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

I 5 6 5 2 3 3 2

I

I I I 2 I

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6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

6 F F E [)-euro-- euro--iHt-amp---tr--6--tr-4 H G F E C C A A 9 7 6 6 6 6 I

I H l 0 8 A987t3t31 H G F C A 66132 G F E C 9 I 232 0 0 C C 8 9 7 2 ~ 5 I

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5 8 A C C C 8 8 A 8 8 6 1

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1 3 5 6 7 9 8 8 B B 7 6 I

3 I 6 9 B B 9 8 5 3 3 5 7 9 9 9 6 3

1 1 I 3 6 7 6 3 1 I

I ~

-

-

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I I

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taO

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FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

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3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

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FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

2 If 6 888 8 C C 9 6 t 3 If A C 0 o C 8 8 It 8 8 7 6 6 6 If

2 t 7 9 888 DEE C A A It 8 E F F F 0 C 8 A A A 9 7 7 6 If 2 rshy~

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0

2 5 8 9 ABC 0 E F FED 0 o E 379 A ceo 0 E F G G F G F F- - - - -

If 8 9 9 Ace 0 F F H H H H H

G G G G E 0 B A A A 9 9 8 7 5 G H G F E C A B 8 A 9 8 8 6 5

- r v bull v

H G FEe C A A 9 7 656 5 5

2

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2 6 8 8 A A 8 C E G H I I 3lf5776AE G H I

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FigA-3 LA map TMF8122

A-5

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FigA-4 LA histogram TMF8122

A-6

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FigA-5 LA map TMF8046

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FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

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FigA-7 LA map TMF8055

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FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

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- FigA-9 Washington map TMF4039

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FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

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0 Ol

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1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

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X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

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FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

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bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

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FigA-I3 Washington map TMF4054

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FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

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l-4-204141_

1 1 75 - 3 If If 3 3 1 -

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2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

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X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

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FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

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2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

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FigA-17 Philadelphia map TMFS026

A-19

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FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

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FigA-19 Philadelphia map TMF5005

A-21

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FigA-20 Philadelphia histogram TMFSOOS

A-22

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~-- -_rshy - ~

-- ~ ~

~

~ --

10 - -shy

~ -

05

- shy - -

~

~l I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

--

CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

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-

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20

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~

- ~

-

~ -05 -

o 10 20 30

RANGE

40 50

Il (nmil

60

I

70 I

80

I

90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

1 It 5 6 6 7 7 9 A 0 0 2 It 5 6 7 7 7 7 9 A A

2 It 5 II 6 6 5 It 7 8 7 2 It 5 It 3 3 If 3 If If 3 I 2 3 2 2 3 2 1 I I 2 3 2 1 I

1 1

2 3 ~

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If

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It 5 5 5 3 I

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2

-

-

-

-50 Ishy -

-75 Ishy -

bull bull

-100 I

-75 I I I

-50 -25 0 25

X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

0 15 ~ - shyw CD E shygt z

-~

~ -r shy10 shy-- - r-

~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

REFERENCES

1 PR Drouilhet DABS A System Description Project Report ATC-42 Lincoln Laboratory MIT FAA-RD-74-l89 (18 November 1974)

2 VA Orlando JD Welch Beacon CAS (BCAS) An Integrated AirGround Collision Avoidance System Project Report ATC-62 Lincoln Laboratory MIT FAA-RD-76-2 (23 March 1976)

3 WH Harman et aI Discrete Address Beacon System (DABS) Test Plan for FY1976 Project Report ATC-56 Lincoln Laboratory MIT FAA-RD-75-l45 (14 November 1975) p 7-10

shy4 WI Wells Verification of DABS Sensor Surveillance Performance

(ATCRBS-mode) at Typical ASR Sites Throughout CONUS Project Report ATC-79 Lincoln Laboratory MIT FAA-RD-77-ll3 (20 December 1977)

5 Reference Data for Radio Engineers ITT Fifth Edition (1968) pp 39-5

6 Users Manual for the Los Angeles Basin Standard Traffic Model MITRE Corp FAA-RD-73-88 p 73

30

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

-1-4-20460 shy

fshy -

-50

~

cshy o Z

E c

50

o

f shy

~

I

2

I

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I 1 3 t 3 1 1

1 3 t 6 7 5 3 3 2 5 t 5 7 A A A 9 6 I 6

6 9 8 C 0 C A 6 3 5 7 C C E F E 0 8 9 8 C

2 7 9 C E G G G F 0 0 0 E 5 8 8 o E F G H G E E F F 7 9 Il euro --iH-6 II 6 amp--shy7 8 9 8 8 0 F G H I I I I 5 7 8 8 8 9 8 F H I J J J I 3 I I 3 2 3 C F r J J J

9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

I 5 6 5 2 3 3 2

I

I I I 2 I

I 2 3 2 I 2 2 2 t t 3 2

2 2 3 t ~ 6 r 2 2 2 3 3 5 6 D t I

6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

6 F F E [)-euro-- euro--iHt-amp---tr--6--tr-4 H G F E C C A A 9 7 6 6 6 6 I

I H l 0 8 A987t3t31 H G F C A 66132 G F E C 9 I 232 0 0 C C 8 9 7 2 ~ 5 I

9 8 C C C 8 A 8 7 7 6 t

5 8 A C C C 8 8 A 8 8 6 1

6 7 9 8 C C 8 A 9 8 6 t

1 3 5 6 7 9 8 8 B B 7 6 I

3 I 6 9 B B 9 8 5 3 3 5 7 9 9 9 6 3

1 1 I 3 6 7 6 3 1 I

I ~

-

-

-

-

- -

-100

I I

-50 I

o I I

50

I

taO

X (nmi East 1 Mag)

FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

E

c CJ

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W CD

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z ~ - - shy

3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

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FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

2 If 6 888 8 C C 9 6 t 3 If A C 0 o C 8 8 It 8 8 7 6 6 6 If

2 t 7 9 888 DEE C A A It 8 E F F F 0 C 8 A A A 9 7 7 6 If 2 rshy~

o Z

0

2 5 8 9 ABC 0 E F FED 0 o E 379 A ceo 0 E F G G F G F F- - - - -

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G G G G E 0 B A A A 9 9 8 7 5 G H G F E C A B 8 A 9 8 8 6 5

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2

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2 6 8 8 A A 8 C E G H I I 3lf5776AE G H I

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1 2 1 8 E F G H H GEe 9 5 5 2 gt- - 25 - 3 A C C 0 F E 0 C It A 8 5 5 5 2 -

5 8 8 7 A B 888 A A 9 7 6 3 If 6 6 1 6 9 A 8 8 8 A 8 5 1 2 5 If 1 1 2 7 A 8 B 8 8 5 2

2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

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rshy

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I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

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FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

75

I 2 2 I 3 J 2

2 + + 3 2 50 2 5 5 At J

I 3 2 I 2 + 5 5 5 2 3 At At At 3 + 5 Igt 5 + 1 1

I 3 5 6 6 7 Igt 8 5 5 3 I 2 3 2 1 2 3 At 6 8 8 8 1 2 Igt 8 8 l 2 I I + J I

25 I 2 2 5 A B A 1 Igt 1 7 1 5 5 6 Igt 5 3 1 2 3 3 1 CO D I I I At 8 A C C 8 8 + 3 I A 8 8 8 A 8 1 5 5 Igt 8 7 7 5 2 2 2 3 6 9 B C E E 0 C 9 8 A 0 0 0 0 8 A 1 Igt 1 1 8 8 7 5 2 ~ 2 At It 6 8 A C E F F F E 0 C C E F E 0 A 9 Igt Igt 7 7 7 7 5 1 ~ 0 Z

a 2 It

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2 3 3 + 6 Igt Igt 7 8 9 8 5 2 l 1 9 A A 9 7 5 I

2 3 3 57768A4 A I J 5 9 A 8 1 5

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I J J I b b i) b b b 5 J -75 1 3 + 5 I 1

I I 2

~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

-

7 CENTERPOINT -20 nmi -5 nmi -

6 - -rshylL

r shy _

lt -0 U 0 5 - -lt

lL _ r-

o -0 W 4 - -CD ~ ~ r-

z -

shy--

2 fshy -- -

rshy -

1-shyI--~-

-

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmj)

FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

Ishy

~-

t -75

-50

25

gt- -25

r-o 0 z

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1

1 1 2

A bull amp

1

2 2 2 1 If

2

2 2 2 2 4f

If bull

2

1

3 2 4f

5 1 V

4f

3

1 2 2 5 5 1 8 A V

6 If 2

1 2 1 1 3 3 2 2 1 7 3 2 2 2 2 5 6 6 5 3 1 6 7 7 3 2 3 2 2 1 6 8 9 9 8 4f 1 6 6 7 3 5 4f 4f 4f 1 1 7 9 B B A 8 poundf 2 3 At 9 7 8 8 8 6 6 At 4f 5 6 7 8 A C 0 C B 9 8 A A C 0 C 8 B 9 8 1 1 1 1 8 9 B C 0 0 0 0 C C 0 E E E o D B A 9 8 1 1 1 9 A C E F F E 0 E E F F E E 0 C 8 A 8 1 6 6 A - - shy - r _ A

V V V V

1 8 B E F G G G G G o C C B B 8 A 9 1 5 3 3 5 6 8 C F G G H H H G F 0 C 8 8 A 9 1 At 2 1 3 If 5 9 0 F G H H I H G F C C 8 9 8 6 3 2 L 3 6 A C E F Ii H H G E C 8 A 9 1 6 3

2 2 It 7 9 8 C 0 E F F 0 C B A 9 9 7 6 1 2 3 If 6 7 7 8 9 C C B A A B A A 8 7 5

1 2 If 5 6 6 7 7 8 8 9 9 A A 8 8 A 9 5 1 1 2 5 5 6 6 6 7 7 7 1 9 A 8 8 B 8 3

3 It If It At At If 5 5 6 8 A A A 9 3 1 2 2 2 2 1 2 3 t 6 8 A A 8 t

2 t 6 9 8 A 8 5 1 I 3 3 3 8 9 9 A 7 At

I 1 3 It t 1 1 8 8 3 1 2 3 If 2 1 5 6

I 1 1

7 8 7 7

3

5 6 6

5

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4f 3 ~

1

1 1

-

-

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I I I J I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-7 LA map TMF8055

A-9

- -

8 I I r- r J I I I

--4-20467 L ~7 shy

I shy

I- CENTERPOINT -5 nmi -15 nmi _6 ~

f shy

~shy 5 shy

IJ I- shyltX ~

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-rshy

~ f-f- shy2 - shy

-f- shy

~ ~-~ -I shy

- nTh+-_ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

2 3 3 6 1 881 665 6 6 6 6 It 1 1 3 5 6 1 8 9 981 888 8 1 1 6 ~

1 1 1 3 5 8 A 8 8 988 999 9 1 5 3 1 1 3 3 1 1 3 5 6 9 8 C D 989 A A 9 8 5 2 3 3 3 2

25 - 1 3 5 5 2 2 3 6 9 C o U A 9 A A 8 9 6 If 2 3 4f It 3 -1 3 5 5 6 5 1 A C o 0 888 889 6 If It 2

5 6 5 6 A 0 f E 0 C 8 C C 8 9 6 5 5 5 3 1 ~ 2 If 5 5 1 C E F F E o C 8 8 8 9 1 5 5 3 3 2

Lshy~

o z

0 1 1 12236 8 0 F F F E shy bull v

1 1 8 A A C 0 0 o 0

E 0 8 8 A A 1 5 - ~ v v

E C C 9 8 8 If

3 3 If If 2

3 1

2

E c

1 9 A A b B B 8 8 3 1 8 J 9 A A 9 9 A

0 C B 7 6 33 3 2 1 B A 8 6 3 2 3 3 2

gt- -25 - 3 5 6 7 8 9 8 9 9 1 2 5 5 6 1 1 8 8 8

A 9 2 1 5 2 1 2

1 2 2 2 1 3 3 3 2 1 -

5 6 6 5 5 6 7 1 1 6 222 2 3 3 3 2 1 3 5 6 6 6 5 5 5 5 5 If 3 1 122 3 3 2 1 3 5 6 6 5 5 3 If If 2 1 1 2 1 1 2 5 2 1 If 3 3 2 1 122 1

-50 - 1 233 3 2 1 222 1 -223 If 2 1 1 12 3 1 t

2 3 3 1 1 2 1

-75 ~ -

I I I I I I

-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

- FigA-9 Washington map TMF4039

A-II

- -

i i i i i i I I I50 i I I-l l-4-20469 L 45 ~ shy

~ CENTERPOINT -15 nmi 5 nmi40 ~ shy

-r-

r-shy

35 ~ shy

I-r-

rshy -~ IJ 30 ~ shylaquo -a r-u shy -a laquo ~- shyIJ 25 l- I- I- shy0 -a - lshyw CD 20 I- shygt ~

-rshyz ~

- -15 - -~ ~ shyrshy

1-shy

r- 0 shy

rshy

-- -05 shy- Ishy

-

mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

~ 1 If 5 6 6 6 9 A B 0 0 0 lt- C B 9 7 5 If

2 3 5 6 6 7 8 A C 0 0 E 0 C B B A 9 7 5 1s ~

2 If If 5 6 7 9 A C 0 E o C 8 A A A 962 ~ o _0 3 5 6 -+-6--amp--e-9--fr~- ~--i---9--8-8 ~ ~ ~ ~ ~

Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

-50 - 332 -shy2 1

-75 1 - shy

1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

~25 shy

Ishy

Ishy~~ 20 shy

0 U Ishy0

r shyltt Ishy

lL ~o I-shylshy

~ Ishyffi 5 shyf-CD

~ gt z

- 0 shy-

05 shy

Ishy

~

h I I I o

10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

~

1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

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1 1 2 2 2

1 3 3 3 3 1 3 2 If If 3 3 2 6 6 6 5 If 3 2

8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

-

--

-

-75 ~

--

-

1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

~

-shyz

10 ~ shy-

05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

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-75 - 2 3 2 1 -

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-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

-- -

Ishy

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IJ shylaquo 0 I- shyu ~ 0

laquo IJ

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2 - shy~ -f-

-fshy -

~ shy

I- shy

-

J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

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3 6 7 7 7 7 9 A B B 8 A 7 6 7 A A 9 7 5 3 1 f 6 6 6 8 9 A A A 9 6 If If 7 9 9 8 6 3

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2 2 I I -I

I I I I I I

-100 -75 -50 -25 o 25 50 75 100 bull

x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

I I lr- I I I I

l-4-204771_ 45 I- r- shy

r shy

~ ~ - CENTER POINT 020 nmi ~r-40 - shy-

shy-r-shy

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I shy

10 - - shyI shy

-rshy-r shy

05 - - shy

- ~

rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

3 pound+ It 6 8 8 8 1 e 5 3 1 5 1 1 8 8 6 pound+

2 3 pound+ 5 7 8 8 8 1 6 5 5 5 6 6 6 6 8 I 8 6 2 50 ~ 2 3 5 8 lt) lt) lt) 8 6 2 3 5 7 7 6 6 7 8 lt) lt) 8 5 3 -

2 3 5 8 lt) A lt) 7 6 pound+ 1 8 8 1 5 7 8 8 lt) lt) 1 6 3 ~ 3 5 6 7 7 lt) lt) A A 7 5 3 1 6 8 lt) 7 5 3 5 8 lt) lt) lt) 7 3

1 pound+ 6 1 8 S lt) A lt) A 7 5 pound+ 1 3 lt) lt) 8 3 3 3 5 8 9 9 9 6 5 2 3 6 8 9 lt) lt) lt) lt) 8 lt) 8 lt) 8 6 1 A A lt) 6 7 1 8 9 lt) lt) 7 5 pound+ 2 1

0 0

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8 7

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2 5 6 6 1 2 5 6 7 8 8 8 1 6 5 6 8 8 1 1 5 It 3 1 1 5 6 6 6 6 6 6 6 5 If 1 1 8 6 5 3 1

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1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

~ u lt 0 U 0 lt

u 0 0 W (II

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25

20

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-rshy

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rh 90 100

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FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

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I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

s shy~

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1 3 ~ 5 6 f 6 A C 0 E E A 8 5 1

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ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

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75 100

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bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

- r- I r r I I I 1 I

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40 ~ -CENTER POINT -10 mni 5 mni

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r-

t 30 laquo 0 U g laquo 25 u 0

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~

~l I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

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-50 ~ 3 b b It shy5 5 2 5 3

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j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

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CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

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20

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RANGE

40 50

Il (nmil

60

I

70 I

80

I

90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

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1 1

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bull bull

-100 I

-75 I I I

-50 -25 0 25

X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

0 15 ~ - shyw CD E shygt z

-~

~ -r shy10 shy-- - r-

~-~

--

-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

APPENDIX

DETAILED COMPUTER OUTPUTS

For each of the TMF measurements discussed in Sections 2 and 3 the traffic density map and the range distribution histogram centered at the location of highest density are given in this appendix The traffic density maps all indicate density by the same log scale as defined in Fig 1 and in all cases the density is the average within a radius of 10 nmi

Table Al serves as a listing of the contents of this Appendix and also includes the date and time-of-day of each measurement

A-I

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

100 I I I I I I

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fshy -

-50

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E c

50

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2

I

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6 9 8 C 0 C A 6 3 5 7 C C E F E 0 8 9 8 C

2 7 9 C E G G G F 0 0 0 E 5 8 8 o E F G H G E E F F 7 9 Il euro --iH-6 II 6 amp--shy7 8 9 8 8 0 F G H I I I I 5 7 8 8 8 9 8 F H I J J J I 3 I I 3 2 3 C F r J J J

9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

I 5 6 5 2 3 3 2

I

I I I 2 I

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6 2 3 I I 6 7 6 t I 6 7 6 ~ 6 8 7 7 t 2 3 3 2 6 8 8 9 9 9 A 8 5 3 I t 3 1 9 8 C C C 8 C C 8 9 8 6 I shy0 E F F E E 0 0 C A 9 6 3 F G G G F E E E 0 8 9 6 3 3 2 G G H G F E DOC 886 6 5 I

6 F F E [)-euro-- euro--iHt-amp---tr--6--tr-4 H G F E C C A A 9 7 6 6 6 6 I

I H l 0 8 A987t3t31 H G F C A 66132 G F E C 9 I 232 0 0 C C 8 9 7 2 ~ 5 I

9 8 C C C 8 A 8 7 7 6 t

5 8 A C C C 8 8 A 8 8 6 1

6 7 9 8 C C 8 A 9 8 6 t

1 3 5 6 7 9 8 8 B B 7 6 I

3 I 6 9 B B 9 8 5 3 3 5 7 9 9 9 6 3

1 1 I 3 6 7 6 3 1 I

I ~

-

-

-

-

- -

-100

I I

-50 I

o I I

50

I

taO

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FigA-l LA map TMF8126

A-3

- -

10 I I I I I T I I1 l-4-20461 L

9 shy-1-

I shy

Z I 8 I- CENTER POINT -10 nmi -10 nml m shy

E

c CJ

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W CD

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z ~ - - shy

3 - shy

r-shy~2 - shy

1shy

~r-~

~ -

shy ~ o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-2 LA histogram TMF8126

A-4

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

1 2 2 1 1 1 2 2 3 2 2 1 3 If t 3 3 2 1 2 2 1 2 3 3 2 2 8 5 5 If 2 5 7 8 6 If 3 2 1

1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

2 If 6 888 8 C C 9 6 t 3 If A C 0 o C 8 8 It 8 8 7 6 6 6 If

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0

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5 8 8 7 A B 888 A A 9 7 6 3 If 6 6 1 6 9 A 8 8 8 A 8 5 1 2 5 If 1 1 2 7 A 8 B 8 8 5 2

2 3 1 1 2 7 A A 8 9 5 2 -50 fshy 389 A 9 7 -

7 7 7 2 5 5 2

-75 -shy

I I I I I I bull

-100 -75 -50 -25 o 25 50 75 100

X (nmi East I Mag)

FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

10 l -4-20463 Lshy~

fo- shy9 CENTERPOINT onmi -10 nmi-

f0- r- shy8

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t- ~~

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I-

r-fshy

2 fo- shyr- -- Ishy -- shy

~~ shy

- ~I o 10 20 30 40 50 60 70 80 90 100

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FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

l-4-20464_

75

I 2 2 I 3 J 2

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I 3 5 6 6 7 Igt 8 5 5 3 I 2 3 2 1 2 3 At 6 8 8 8 1 2 Igt 8 8 l 2 I I + J I

25 I 2 2 5 A B A 1 Igt 1 7 1 5 5 6 Igt 5 3 1 2 3 3 1 CO D I I I At 8 A C C 8 8 + 3 I A 8 8 8 A 8 1 5 5 Igt 8 7 7 5 2 2 2 3 6 9 B C E E 0 C 9 8 A 0 0 0 0 8 A 1 Igt 1 1 8 8 7 5 2 ~ 2 At It 6 8 A C E F F F E 0 C C E F E 0 A 9 Igt Igt 7 7 7 7 5 1 ~ 0 Z

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~~~L~c~l -100 -75 -50 -25 a 25 50 75 100

X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

l- 4-20465 _

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7 CENTERPOINT -20 nmi -5 nmi -

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z -

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2 fshy -- -

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1-shyI--~-

-

o 10 20 30 40 50 60 70 80 90 100

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FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

-75 -

50 -

-

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~-

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25

gt- -25

r-o 0 z

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1

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If bull

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3 2 4f

5 1 V

4f

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1 2 2 5 5 1 8 A V

6 If 2

1 2 1 1 3 3 2 2 1 7 3 2 2 2 2 5 6 6 5 3 1 6 7 7 3 2 3 2 2 1 6 8 9 9 8 4f 1 6 6 7 3 5 4f 4f 4f 1 1 7 9 B B A 8 poundf 2 3 At 9 7 8 8 8 6 6 At 4f 5 6 7 8 A C 0 C B 9 8 A A C 0 C 8 B 9 8 1 1 1 1 8 9 B C 0 0 0 0 C C 0 E E E o D B A 9 8 1 1 1 9 A C E F F E 0 E E F F E E 0 C 8 A 8 1 6 6 A - - shy - r _ A

V V V V

1 8 B E F G G G G G o C C B B 8 A 9 1 5 3 3 5 6 8 C F G G H H H G F 0 C 8 8 A 9 1 At 2 1 3 If 5 9 0 F G H H I H G F C C 8 9 8 6 3 2 L 3 6 A C E F Ii H H G E C 8 A 9 1 6 3

2 2 It 7 9 8 C 0 E F F 0 C B A 9 9 7 6 1 2 3 If 6 7 7 8 9 C C B A A B A A 8 7 5

1 2 If 5 6 6 7 7 8 8 9 9 A A 8 8 A 9 5 1 1 2 5 5 6 6 6 7 7 7 1 9 A 8 8 B 8 3

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2 t 6 9 8 A 8 5 1 I 3 3 3 8 9 9 A 7 At

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I 1 1

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FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

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A-II

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mJ4 o 10 20 4030 50 60 70 9080 100

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FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

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0 Ol

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Fig A-II Washington map TMF400I

A-I3

----

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FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

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FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

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l-4-204141_

1 1 75 - 3 If If 3 3 1 -

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25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

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A-17

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100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

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100 I bull J I I J I

l-4-2047SL

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bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

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A-26

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I

50

ll-~

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A-28

Measurement No Location

TABLE Ai CONTENTS OF THE APPENDIX

-Figure Noshy Date of Map Histogram Measurement Day Local Time

Max Time-and Spatia1shy

Average Aircraft Count R=10 nmi

TMF 8126 LA Al A2 21 Nov 76 Sun 11 30-11 49 PST 30

TMF 8122 LA A3 A4 20 Nov 76 Sat 1400-1418 PST 26

TMF 8046 LA A5 A6 11 Nov 76 Thurs 1626-1645 PST 26

TMF 8055 LA A7 A8 15 Nov 76 Mon 1238-1256 PST 21

gtI

N

TMF

TMF

4039

4001

Washington

Washington

A9

All

A10

A12

24 May 76

6 May 76

Mon

Thurs

11 14-11 34 EDT

1557-1621 EDT

12

8

TMF 4054 Washington AU A14 28 May 76 Fri 1258-1324 EDT 8

TMF 5139 Phila A15 A16 21 July 76 Wed 1014-1026 EDT 11

TMF 5026 Phila A17 A18 24 June 76 Thurs 1358-1428 EDT 8

TImiddot1F 5005 Phila A19 A20 15 June 76 Tues 0955-1008 EDT 9

TMF 3031 Boston A21 A22 26 March 76 Fri 2045-2104 EST 12

TMF 3037 Boston A23 A24 29 March 76 Mon 1541-1559 EST 10

TMF 3008 Boston A25 A26 10 March 76 Wed 1142-1212 EST 8

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9 0 F H H H 5 9 C 0 o 0 2 5 8 A 9 r I 5 6 r 7 5

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FigA-l LA map TMF8126

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FigA-2 LA histogram TMF8126

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FigA-3 LA map TMF8122

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FigA-5 LA map TMF8046

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FigA-6 LA histogram TMF8046

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FigA-7 LA map TMF8055

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FigA-8 LA histogram TMF8055

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FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

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X (nmi East Mag)

Fig A-II Washington map TMF400I

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----

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FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

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bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

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X (nmi East Mag)

FigA-I3 Washington map TMF4054

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FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

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l-4-204141_

1 1 75 - 3 If If 3 3 1 -

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2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

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X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

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FigA-16 Philadelphia histogram TMF5I39

A-18

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50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

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FigA-17 Philadelphia map TMFS026

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FigA-18 Philadelphia histogram TMF5026

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FigA-19 Philadelphia map TMF5005

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FigA-15 Philadelphia map TMF5I39

A-17

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FigA-16 Philadelphia histogram TMF5I39

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50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

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FigA-17 Philadelphia map TMFS026

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FigA-18 Philadelphia histogram TMF5026

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FigA-19 Philadelphia map TMF5005

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FigA-20 Philadelphia histogram TMFSOOS

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bullbull11 FigA-21 Boston map TMF3031

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FigA-22 Boston histogram TMF3031

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A-24

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FigA-23 Boston map TMF3037

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Fig A-25 Boston map TMF3008

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bull FigA-26 Boston histogram TMF3008

A-28

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FigA-2 LA histogram TMF8126

A-4

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FigA-3 LA map TMF8122

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FigA-5 LA map TMF8046

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FigA-6 LA histogram TMF8046

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FigA-8 LA histogram TMF8055

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1-shy

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rshy

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-

mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

~ 1 If 5 6 6 6 9 A B 0 0 0 lt- C B 9 7 5 If

2 3 5 6 6 7 8 A C 0 0 E 0 C B B A 9 7 5 1s ~

2 If If 5 6 7 9 A C 0 E o C 8 A A A 962 ~ o _0 3 5 6 -+-6--amp--e-9--fr~- ~--i---9--8-8 ~ ~ ~ ~ ~

Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

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1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

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10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

~

-

~

1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

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1 1 2 2 2

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8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

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1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

CENTERPOINT- 0 deg shy

25 ~ shy

_ --

20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

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-shyz

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05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

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X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

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2 - shy~ -f-

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J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

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x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

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l-4-204771_ 45 I- r- shy

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FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

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bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

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FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

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bullbull11 FigA-21 Boston map TMF3031

A-23

50

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FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

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2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

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X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

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FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

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Fig A-25 Boston map TMF3008

I

50

ll-~

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bull FigA-26 Boston histogram TMF3008

A-28

100 I I I I l-4-204621_

75 shy~

1 1 1 1 1 1 2 2 1 -

50 - 1 1 1 1 2 1 2 1 1 -1 2 1 1 1 1 2 3 2 t 2 1

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1 233 3 2 5 5 If 3 3 6 8 8 7 6 7 9 9 9 8 5 3 1 25 ~ 1 2 3 356 888 7 5 2 1 6 8 It It A It It 8 A 8 6 2 1 2 1 1 -

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FigA-3 LA map TMF8122

A-5

bull I ~ I I I I I I

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FigA-4 LA histogram TMF8122

A-6

100 ~ j~-tmiddot~middot Aj ~(- ~-middotTtmiddotmiddotr-T-imiddotmiddot- I-r-r-r~

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X (nmi East Mag)

FigA-5 LA map TMF8046

A-7

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

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FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

-1-4-20466 L

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FigA-7 LA map TMF8055

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FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

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1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

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- FigA-9 Washington map TMF4039

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FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

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0 Ol

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Fig A-II Washington map TMF400I

A-I3

----

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FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

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bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

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FigA-I3 Washington map TMF4054

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FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

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l-4-204141_

1 1 75 - 3 If If 3 3 1 -

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2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

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FigA-15 Philadelphia map TMF5I39

A-17

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FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

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2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

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FigA-17 Philadelphia map TMFS026

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FigA-18 Philadelphia histogram TMF5026

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100 I bull J I I J I

l-4-2047SL

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FigA-19 Philadelphia map TMF5005

A-21

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A-22

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bullbull11 FigA-21 Boston map TMF3031

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FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

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FigA-23 Boston map TMF3037

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Fig A-25 Boston map TMF3008

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FigA-4 LA histogram TMF8122

A-6

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FigA-5 LA map TMF8046

A-7

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FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

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FigA-7 LA map TMF8055

A-9

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FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

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- FigA-9 Washington map TMF4039

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FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

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0 Ol

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X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

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FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

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FigA-I3 Washington map TMF4054

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FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

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l-4-204141_

1 1 75 - 3 If If 3 3 1 -

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2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

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X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

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FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

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2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

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x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

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FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

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bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

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FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

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bullbull11 FigA-21 Boston map TMF3031

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FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

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FigA-23 Boston map TMF3037

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FigA-24 Boston histogram TMF3037

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Fig A-25 Boston map TMF3008

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bull FigA-26 Boston histogram TMF3008

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FigA-5 LA map TMF8046

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FigA-6 LA histogram TMF8046

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FigA-7 LA map TMF8055

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FigA-8 LA histogram TMF8055

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FigA-IO Washington histogram TMF4039

A-12

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X (nmi East Mag)

Fig A-II Washington map TMF400I

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FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

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X (nmi East Mag)

FigA-I3 Washington map TMF4054

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FigA-14 Washington histogram TMF4054

A-16

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1 1 75 - 3 If If 3 3 1 -

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X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

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FigA-16 Philadelphia histogram TMF5I39

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FigA-17 Philadelphia map TMFS026

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bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

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rh 90 100

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FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

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-1-4-20480 _

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bullbull11 FigA-21 Boston map TMF3031

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FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

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z ~ _- po vI o 0 ~ v v v ~ ~

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X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

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FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

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Fig A-25 Boston map TMF3008

I

50

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RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

9 -i~middot middotT-~y Tr-r-1f-r-r-~r-fI--r-r-rY-1 middot~rmiddotr- It

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FigA-6 LA histogram TMF8046

A-8

100 I I I I I I

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V V V V

1 8 B E F G G G G G o C C B B 8 A 9 1 5 3 3 5 6 8 C F G G H H H G F 0 C 8 8 A 9 1 At 2 1 3 If 5 9 0 F G H H I H G F C C 8 9 8 6 3 2 L 3 6 A C E F Ii H H G E C 8 A 9 1 6 3

2 2 It 7 9 8 C 0 E F F 0 C B A 9 9 7 6 1 2 3 If 6 7 7 8 9 C C B A A B A A 8 7 5

1 2 If 5 6 6 7 7 8 8 9 9 A A 8 8 A 9 5 1 1 2 5 5 6 6 6 7 7 7 1 9 A 8 8 B 8 3

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FigA-7 LA map TMF8055

A-9

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FigA-8 LA histogram TMF8055

A-10

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

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1 1 1 3 5 8 A 8 8 988 999 9 1 5 3 1 1 3 3 1 1 3 5 6 9 8 C D 989 A A 9 8 5 2 3 3 3 2

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- FigA-9 Washington map TMF4039

A-II

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FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

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Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

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X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

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RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

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1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

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X (nmi East Mag)

FigA-I3 Washington map TMF4054

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FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

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1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

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X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

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FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

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FigA-17 Philadelphia map TMFS026

A-19

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FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

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FigA-19 Philadelphia map TMF5005

A-21

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FigA-20 Philadelphia histogram TMFSOOS

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100 bull bull bull r I bull I I - -

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bullbull11 FigA-21 Boston map TMF3031

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FigA-22 Boston histogram TMF3031

bull

A-24

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FigA-23 Boston map TMF3037

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FigA-24 Boston histogram TMF3037

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Fig A-25 Boston map TMF3008

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A-28

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FigA-7 LA map TMF8055

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FigA-8 LA histogram TMF8055

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FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

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0 Ol

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X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

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FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

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FigA-I3 Washington map TMF4054

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FigA-14 Washington histogram TMF4054

A-16

-------------------------

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1 1 75 - 3 If If 3 3 1 -

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2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

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FigA-15 Philadelphia map TMF5I39

A-17

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FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

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2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

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FigA-17 Philadelphia map TMFS026

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FigA-19 Philadelphia map TMF5005

A-21

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3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

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-50 ~ 3 b b It shy5 5 2 5 3

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j I I I I I

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X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

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40 50

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FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

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50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

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5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

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Fig A-25 Boston map TMF3008

I

50

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I I II

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bull FigA-26 Boston histogram TMF3008

A-28

100 I I l-4-20468 L

75 - 2 2 ~ -1 1 5 3 1

1 2 2 3 665 5 If 3 2 3 3 655 555 If 1

1 3 3 655 5 It 3 2 1 50 ~ 2 3 3 6 115 555 3 If If 2 -

2 3 3 6 1 881 665 6 6 6 6 It 1 1 3 5 6 1 8 9 981 888 8 1 1 6 ~

1 1 1 3 5 8 A 8 8 988 999 9 1 5 3 1 1 3 3 1 1 3 5 6 9 8 C D 989 A A 9 8 5 2 3 3 3 2

25 - 1 3 5 5 2 2 3 6 9 C o U A 9 A A 8 9 6 If 2 3 4f It 3 -1 3 5 5 6 5 1 A C o 0 888 889 6 If It 2

5 6 5 6 A 0 f E 0 C 8 C C 8 9 6 5 5 5 3 1 ~ 2 If 5 5 1 C E F F E o C 8 8 8 9 1 5 5 3 3 2

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I I I I I I

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- FigA-9 Washington map TMF4039

A-II

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mJ4 o 10 20 4030 50 60 70 9080 100

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FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

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Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

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X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

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CENTERPOI NT 05 nmi

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RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

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-25

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1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

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5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

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FigA-I3 Washington map TMF4054

A-I5

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FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

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1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

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FigA-15 Philadelphia map TMF5I39

A-17

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FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

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2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

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FigA-17 Philadelphia map TMFS026

A-19

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FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

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FigA-19 Philadelphia map TMF5005

A-21

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FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

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bullbull11 FigA-21 Boston map TMF3031

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FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

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2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

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X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

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FigA-24 Boston histogram TMF3037

A-26

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Fig A-25 Boston map TMF3008

I

50

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A-28

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mJ4 o 10 20 4030 50 60 70 9080 100

RANGE (nmi)

FigA-IO Washington histogram TMF4039

A-12

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

2 3 3 It It 6 6 6 9 8 8 7 6 7 7 5 2 1 3 If If 6 7 7 8 9 A A 9 7 7 8 7 6 If

1 1 3 It It 7 8 9 A C C A 8 8 9 9 8 6 3 25 f- 1 3 If 3 It If 7 9 A C C C B A 9 A A 9 7 It 3 shy

0 Ol

2 3 5 5 5 5 8 9 B C 0 0 C B B B B 9 middot7 5 3 C C

~ 1 If 5 6 6 6 9 A B 0 0 0 lt- C B 9 7 5 If

2 3 5 6 6 7 8 A C 0 0 E 0 C B B A 9 7 5 1s ~

2 If If 5 6 7 9 A C 0 E o C 8 A A A 962 ~ o _0 3 5 6 -+-6--amp--e-9--fr~- ~--i---9--8-8 ~ ~ ~ ~ ~

Z 2 It 567 7 7 8 ABC B A 8 778 755 3 1

1 2 356667 7 9 B A 8 6 7 7 765 It 3 2E c 3 It It It It 5 7 8 9 77677661f331

233 322 7 8 8 6 7 6 6 6 ( 5 3 2 1gtshy -25 f- 2 5 6 5 If 3 6 7 7 6 6 6 6 6 6 4 2 1 shy5 765 3 2 It 5 6 555 665 3 1 5 665 3 1 2 If 5 5 5 If It 2 3 It 5 3 I 3 3 If It l 2

1 3 3 3 1 1

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1 I I I I j _ I l

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

I - - - - - --

I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

CENTERPOI NT 05 nmi

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10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

E c-gtshy

-25

-50

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-

~

1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

1 It 6 8 9 A A 1 3 It 1 9 A 8 A

1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

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1 1 2 2 2

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8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

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1 1 1 I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

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CENTERPOINT- 0 deg shy

25 ~ shy

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20 - shy~ IJ ltt a U shya -ltt IJ 15 shy0 - shya UJ CD f shyE --- gt

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05 shy

n I I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

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FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

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J 1n o 10 20 30 40 50 60 70 80 90 100

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FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

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FigA-17 Philadelphia map TMFS026

A-19

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l-4-204771_ 45 I- r- shy

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FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

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FigA-19 Philadelphia map TMF5005

A-21

45

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FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

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bullbull11 FigA-21 Boston map TMF3031

A-23

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FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

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z ~ _- po vI o 0 ~ v v v ~ ~

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3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

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j I I I I I

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X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

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FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

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2 5 ~ 01 0 e L-~ 00 Z

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5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

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2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

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1 1

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Fig A-25 Boston map TMF3008

I

50

ll-~

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A-27

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bull FigA-26 Boston histogram TMF3008

A-28

100 I I I I I I

l-4-20470 L

-75 rshy

50 i- 1 1 If 3 3 2 shy2 3 3 If 6 6 6 5 6 5 It 3

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0 Ol

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X (nmi East Mag)

Fig A-II Washington map TMF400I

A-I3

----

--

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RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

25

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-25

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1 2 3 1 2 It 5 6 1 2 5 1 8 8 9

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1 2 2 3 5 8 A A C C 1 2 3 6 1 8 B C D

1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

3 3 If 6 1 8 8 8 2 3 5 6 1 1 6 5 1 3 5 5 It 3 2 1

1 332 1 1

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1 1 2 2 2

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8 8 8 1 5 If 1 A 9 9 9 8 If 3 2 3 2 8 A 8 A 9 8 6 5 5 It 2 8 8 B a A 9 6 5 5 It 2 D C C B A 8 1 5 3 1 D C C B 9 8 6 If 3 2 1 - - shy __ AA_ - ~ ~ ~ C B B A 8 1 If If It 2 B A A 9 1 If 3 If If 3 2 9 9 9 8 5 3 2 3 3 2 8 8 8 1 It 3 221 1 7 1 6 It 3 2 1 6 6 6 5 If 3 2 2 If If 6 5 3 2 1

5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

-

-

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1 1 1 I I I

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X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

I 1 I 30 shy - l- 4-20473 Lshy

--

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25 ~ shy

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RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

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FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

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FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

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FigA-17 Philadelphia map TMFS026

A-19

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FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

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FigA-19 Philadelphia map TMF5005

A-21

45

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FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

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bullbull11 FigA-21 Boston map TMF3031

A-23

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FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

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X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

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FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

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Fig A-25 Boston map TMF3008

I

50

ll-~

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A-27

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RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

----

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I I I I I I- 1 - l -4-20471 L30 - - - r- shy- I- ~ - shy

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10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-12 Washington histogram TMF4001

A-14

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

50

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1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

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5 5 5 3 2 5 6 5 If 2 6 6 5 2 5 5 2 3 1

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X (nmi East Mag)

FigA-I3 Washington map TMF4054

A-I5

--

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RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

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-75 - 2 3 2 1 -

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X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

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J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

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FigA-17 Philadelphia map TMFS026

A-19

--

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l-4-204771_ 45 I- r- shy

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RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

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FigA-19 Philadelphia map TMF5005

A-21

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bullbull11 FigA-21 Boston map TMF3031

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FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

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FigA-23 Boston map TMF3037

A-25

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FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

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Fig A-25 Boston map TMF3008

I

50

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RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

100 I bullbull bull I I I I t

l-4-20472 L

75 ~ -

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1 3 3 3 3 5 1 8 8 D D r I I bull A

bull V -1 3 6 6 6 7 8 A C D 1 3 It 5 5 5 6 8 A C C

133 3 3 3 1 9 A B 1 5 1 9 A 9

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FigA-I3 Washington map TMF4054

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FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

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l-4-204141_

1 1 75 - 3 If If 3 3 1 -

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2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

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FigA-15 Philadelphia map TMF5I39

A-17

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FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

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2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

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FigA-17 Philadelphia map TMFS026

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FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

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FigA-19 Philadelphia map TMF5005

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45

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FigA-20 Philadelphia histogram TMFSOOS

A-22

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bullbull11 FigA-21 Boston map TMF3031

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FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

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X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

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FigA-24 Boston histogram TMF3037

A-26

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RANGE (nmi)

FigA-14 Washington histogram TMF4054

A-16

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

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6

7

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1 1 If 5 7 9 8 C 8 8 9 9 C C 8 A 7 3 1 1 gtshy -25 ~ 1 1 2 7 A C C C 8 A A 9 8 8 9 6 -

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-75 - 2 3 2 1 -

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-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

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Ishy

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laquo IJ

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2 - shy~ -f-

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J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

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3 6 7 7 7 7 9 A B B 8 A 7 6 7 A A 9 7 5 3 1 f 6 6 6 8 9 A A A 9 6 If If 7 9 9 8 6 3

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2 2 I I -I

I I I I I I

-100 -75 -50 -25 o 25 50 75 100 bull

x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

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l-4-204771_ 45 I- r- shy

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shy-r-shy

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rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

3 pound+ It 6 8 8 8 1 e 5 3 1 5 1 1 8 8 6 pound+

2 3 pound+ 5 7 8 8 8 1 6 5 5 5 6 6 6 6 8 I 8 6 2 50 ~ 2 3 5 8 lt) lt) lt) 8 6 2 3 5 7 7 6 6 7 8 lt) lt) 8 5 3 -

2 3 5 8 lt) A lt) 7 6 pound+ 1 8 8 1 5 7 8 8 lt) lt) 1 6 3 ~ 3 5 6 7 7 lt) lt) A A 7 5 3 1 6 8 lt) 7 5 3 5 8 lt) lt) lt) 7 3

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0 0

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2 5 6 6 1 2 5 6 7 8 8 8 1 6 5 6 8 8 1 1 5 It 3 1 1 5 6 6 6 6 6 6 6 5 If 1 1 8 6 5 3 1

3 6 1 1 6 5 2 2 pound+ If If 5 1 1 6 It 2 1 1 5 7 1 6 6 3 2 If 5 6 6 It

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1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

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n CENTER POINT 0 10

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35 -

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rh 90 100

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FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

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-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

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q t II) 6 8 8 9 f T 5 t Cgt 3 1 ~ 1 If 5 T 9 A e a 8 8 6 It 3 5 5 5 5 1 9 8 C C 8 9 8 6

1 3 ~ 5 6 f 6 A C 0 E E A 8 5 1

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ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

1 If 5 8 8 816 8 7 5 3 3 5 6 1 716 1 1 6 3

1 3 1 1 8 IJ 8 1 5 If 1 1 5 8 8 8 6 5 2 1

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-50

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75 100

bull x (nmi East Mag)

bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

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~l I I

o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

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CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

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20

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40 50

Il (nmil

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80

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90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

__ AA __

V w w ~ ~

1 It 5 6 6 7 7 9 A 0 0 2 It 5 6 7 7 7 7 9 A A

2 It 5 II 6 6 5 It 7 8 7 2 It 5 It 3 3 If 3 If If 3 I 2 3 2 2 3 2 1 I I 2 3 2 1 I

1 1

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-100 I

-75 I I I

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X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

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--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

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~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

-------------------------

100 I I - -

I I I~i i I I~

l-4-204141_

1 1 75 - 3 If If 3 3 1 -

2 3 If 6 7 6 5 3 1 2 5 6 5 1 1 5 7 7 7 5 3 If 6 6 3

1 If 6 6 6 5 3 6 7 7 6 5 6 If 5 7 8 9 8 6 3 I

2 5 7 7 6 5 If 5 6 7 5 7 7 8 9 9 9 A 9 9 8 6 If 50 ~ 2 3 If 5 If If 3 If 5 5 5 5 7 9 A A A A 8 A A 9 8 7 3 -

2 If 6 6 6 If 3 3 3 If If If 8 9 A A A A B A A A A 9 7 3 If 6 7 8 7 7 6 6 If 6 8 8 9 9 9 9 9 A B B A B A 9 7 If

1 2 3 6 8 8 9 9 7 8 A A B A 9 9 7 7 A A 8 8 B B B A 8 5 3 5 5 5 If 7 8 8 A A B C C C C B A A B C 0 C A A 9 A A 8 5

25 - 2 5 7 7 6 5 5 8 9 A B C 0 E F D C 8 C C 0 D C B 8 7 7 8 6 3 -C 0 1 6 7 7 6 If 5 8 9 8 B C E F F D C A C C E D 8 A 5 3 3 2 If 2

2 5 6 6 5 5 8 8 9 A B C E F F 0 8 A A C 0 C 8 7 1 If 5 5 1 3 If If 3 If 5 6 9 9 A 9 9 C E F 8 A 9 8 9 A 9 8 If 3 If 6 5 3 r shy 1 If 5 If 5 5 6 7 8 A A A 9 A C 0 8 9 6 7 9 8 8 6 1 1 2 5 7 6 3 ~

0 2

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2 3 3 3 If 6 A C C C A A 9 9 9 9 5 2 3 If 5 5 6 9 8 8 A 8 8 8 9 7 If

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-75 - 2 3 2 1 -

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-100 -75 -50 -25 o 25 50 75 100

X (nmi East Mag)

FigA-15 Philadelphia map TMF5I39

A-17

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

-- -

Ishy

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laquo IJ

3 - shy~ 0 f- shy-0 - l- I-- IshyIJJ shyCD - E I-lshygt shyz

2 - shy~ -f-

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I- shy

-

J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

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3 It 6 6 6 6 7 8 A amp 8 8 A A A 9 9 9 8 i 6 3 1 2 3 3 2 gt- -25 ~ 3 Ii 7 7 1 7 8 9 B B 8 B A lt1 8 8 9 9 8 7 + 1 -

3 6 7 7 7 7 9 A B B 8 A 7 6 7 A A 9 7 5 3 1 f 6 6 6 8 9 A A A 9 6 If If 7 9 9 8 6 3

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I I 2 3 1 2 1 I 3 3 2 1

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2 2 I I -I

I I I I I I

-100 -75 -50 -25 o 25 50 75 100 bull

x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

I I lr- I I I I

l-4-204771_ 45 I- r- shy

r shy

~ ~ - CENTER POINT 020 nmi ~r-40 - shy-

shy-r-shy

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rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

3 pound+ It 6 8 8 8 1 e 5 3 1 5 1 1 8 8 6 pound+

2 3 pound+ 5 7 8 8 8 1 6 5 5 5 6 6 6 6 8 I 8 6 2 50 ~ 2 3 5 8 lt) lt) lt) 8 6 2 3 5 7 7 6 6 7 8 lt) lt) 8 5 3 -

2 3 5 8 lt) A lt) 7 6 pound+ 1 8 8 1 5 7 8 8 lt) lt) 1 6 3 ~ 3 5 6 7 7 lt) lt) A A 7 5 3 1 6 8 lt) 7 5 3 5 8 lt) lt) lt) 7 3

1 pound+ 6 1 8 S lt) A lt) A 7 5 pound+ 1 3 lt) lt) 8 3 3 3 5 8 9 9 9 6 5 2 3 6 8 9 lt) lt) lt) lt) 8 lt) 8 lt) 8 6 1 A A lt) 6 7 1 8 9 lt) lt) 7 5 pound+ 2 1

0 0

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pound+

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2 5 6 6 1 2 5 6 7 8 8 8 1 6 5 6 8 8 1 1 5 It 3 1 1 5 6 6 6 6 6 6 6 5 If 1 1 8 6 5 3 1

3 6 1 1 6 5 2 2 pound+ If If 5 1 1 6 It 2 1 1 5 7 1 6 6 3 2 If 5 6 6 It

-50 - 1 pound+ 6 1 5 3 1 1 3 If If If 3 -3 If 5 1 2 2 2 If If 3

1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

-100 -75 -50 -25 o 25 50 75 100

bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

~ u lt 0 U 0 lt

u 0 0 W (II

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30

25

20

15

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-

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10 -

05 -

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rh 90 100

RANGE (nmi)

FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

s shy~

00 2

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-50

f r

-

2 2 3 5 5 2

6 5 6 1 3 6 6 1 1 1 5 1 8 If 2 1 1 1 8 9 8 6 6 8 8 If 2 2

1 3 9 9 A 1 7 1 1 1 - 3 3 2 If 5 6 8 8 8 9 8 6 2 If If 3 2

q t II) 6 8 8 9 f T 5 t Cgt 3 1 ~ 1 If 5 T 9 A e a 8 8 6 It 3 5 5 5 5 1 9 8 C C 8 9 8 6

1 3 ~ 5 6 f 6 A C 0 E E A 8 5 1

1 5 7 1 8 ( 9 8 o E F F C 8 2 2 1 ~

ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

1 If 5 8 8 816 8 7 5 3 3 5 6 1 716 1 1 6 3

1 3 1 1 8 IJ 8 1 5 If 1 1 5 8 8 8 6 5 2 1

3 0 7 16 If 3 i If b If

1 1

-

-

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-

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-75 - -

-100 I I

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-50

I

-25 o I

25

I

50

I

75 100

bull x (nmi East Mag)

bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

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l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

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o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

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RANGE

40 50

Il (nmil

60

I

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80

I

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bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

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bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

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2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

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1 1

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If

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-100 I

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X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

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l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

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to-LL laquo - shy200 Ua 4

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I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

11 I I I 1 I I I I

6 ~ shyl-4-20475 L-

f-

CENTER POINT -5 nml 15 nmi 5 ~ shy

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laquo IJ

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2 - shy~ -f-

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J 1n o 10 20 30 40 50 60 70 80 90 100

RANGE (nmil

FigA-16 Philadelphia histogram TMF5I39

A-18

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

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3 6 7 7 7 7 9 A B B 8 A 7 6 7 A A 9 7 5 3 1 f 6 6 6 8 9 A A A 9 6 If If 7 9 9 8 6 3

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I I 2 3 1 2 1 I 3 3 2 1

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2 2 I I -I

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FigA-17 Philadelphia map TMFS026

A-19

--

I I lr- I I I I

l-4-204771_ 45 I- r- shy

r shy

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rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

3 pound+ It 6 8 8 8 1 e 5 3 1 5 1 1 8 8 6 pound+

2 3 pound+ 5 7 8 8 8 1 6 5 5 5 6 6 6 6 8 I 8 6 2 50 ~ 2 3 5 8 lt) lt) lt) 8 6 2 3 5 7 7 6 6 7 8 lt) lt) 8 5 3 -

2 3 5 8 lt) A lt) 7 6 pound+ 1 8 8 1 5 7 8 8 lt) lt) 1 6 3 ~ 3 5 6 7 7 lt) lt) A A 7 5 3 1 6 8 lt) 7 5 3 5 8 lt) lt) lt) 7 3

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0 0

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8 7

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2 5 6 6 1 2 5 6 7 8 8 8 1 6 5 6 8 8 1 1 5 It 3 1 1 5 6 6 6 6 6 6 6 5 If 1 1 8 6 5 3 1

3 6 1 1 6 5 2 2 pound+ If If 5 1 1 6 It 2 1 1 5 7 1 6 6 3 2 If 5 6 6 It

-50 - 1 pound+ 6 1 5 3 1 1 3 If If If 3 -3 If 5 1 2 2 2 If If 3

1 2 2 2 2 3 3 1 1 3 2 3 2 1

2 1 2 1 ~-75 -

I I I I I - I

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bull X (nmi East J Mag)

FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

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35 -

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30

25

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rh 90 100

RANGE (nmi)

FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

I - shy

I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

s shy~

00 2

E c-gt -25

-50

f r

-

2 2 3 5 5 2

6 5 6 1 3 6 6 1 1 1 5 1 8 If 2 1 1 1 8 9 8 6 6 8 8 If 2 2

1 3 9 9 A 1 7 1 1 1 - 3 3 2 If 5 6 8 8 8 9 8 6 2 If If 3 2

q t II) 6 8 8 9 f T 5 t Cgt 3 1 ~ 1 If 5 T 9 A e a 8 8 6 It 3 5 5 5 5 1 9 8 C C 8 9 8 6

1 3 ~ 5 6 f 6 A C 0 E E A 8 5 1

1 5 7 1 8 ( 9 8 o E F F C 8 2 2 1 ~

ft ft amp amp _ _ _ ft ~ V V - v 7 9 8 8 8 8 8 o 0 F E A 5 3 2 If 8 888 8 8 C C C C 1 If 3 1 6 9 A amp 8 A 9 A A 8 A 8 3 2

589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

1 If 5 8 8 816 8 7 5 3 3 5 6 1 716 1 1 6 3

1 3 1 1 8 IJ 8 1 5 If 1 1 5 8 8 8 6 5 2 1

3 0 7 16 If 3 i If b If

1 1

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25

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50

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75 100

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bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

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l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

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o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

-75 ~ shy

j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

30 --

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CENTER POINT -5 omi 0 -

IshyLL ltt a U a lti IL 0

a w OJ ~ gt z

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25

20

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RANGE

40 50

Il (nmil

60

I

70 I

80

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90 100

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FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

I 3 It It I 2 It 5 ~ b

3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

2 2 2 It 6 8 8 C C 0 2 2 2 2 5 8 B C E E A ft _

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V w w ~ ~

1 It 5 6 6 7 7 9 A 0 0 2 It 5 6 7 7 7 7 9 A A

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1 1

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If

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2 3 ~

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-100 I

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X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

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--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

to-LL laquo - shy200 Ua 4

LL 0

0 15 ~ - shyw CD E shygt z

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~-~

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-1r shyI n shy05

I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

100 1 I 1 J I I -

l-4-20476middotL

1 2 2 75 - 1 3 f f 1 2 3 3 3 2 -

3 5 6 6 3 f 5 5 332 1 2 2 2 2 3 f 6 1 1 f It 5 6 5 3 t 5 5 3

2 3 3 3 f 4 6 1 7 5 f At 5 6 6 1 1 1 6 4f 1 3 3 It 5 5 6 7 8 7 6 5 1 8 888 9 9 8 6 f

50 - 1 3 3 f It 6 6 7 8 8 7 8 9 9 9 999 9 9 T 6 2 -2 L 3 2 f 5 6 ~ T T 6 8 A A 8 A 9 998 9 9 8 6 f

3 6 1 1 6 5 6 7 8 8 6 8 A 8 ~ 8 8 9 718 8 8 8 6 f 2 f 6 8 ij 8 8 8 7 8 A A A A 8 B 8 8 A 7 761 8 T 6 5 f 3 7 9 9 A 9 8 9 A 8 8 C C C C C C 8 9 888 7 T 4f f f 3 1

25 - 3 5 7 8 9 A 9 9 9 8 8 C C 0 0 o 0 0 8 9 888 T 5 3 3 3 2 1 -1 t 5 ( 1 7 8 9 9 9 A B C 0 0 E E E 0 fl A 887 6 5 3 3 2 2

l 5 6 ~ 7 1 T 8 9 A A C 0 0 E o 0 C 8 S c S 7 5 5 It It 3 2

Lshy ~

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C 8 A A A A 8 5 5 5 5 5 5 + 3

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3 6 7 7 7 7 9 A B B 8 A 7 6 7 A A 9 7 5 3 1 f 6 6 6 8 9 A A A 9 6 If If 7 9 9 8 6 3

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I I 2 3 1 2 1 I 3 3 2 1

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2 2 I I -I

I I I I I I

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x (nmi East Mag)

FigA-17 Philadelphia map TMFS026

A-19

--

I I lr- I I I I

l-4-204771_ 45 I- r- shy

r shy

~ ~ - CENTER POINT 020 nmi ~r-40 - shy-

shy-r-shy

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rh- o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

1 pound+ 5 5 6 5 6 6 1 1 1 1 pound+ 1 2 3 6 1 1 6 6 6 pound+ 6 1 8 1 5 5 pound+ 1

3 pound+ It 6 8 8 8 1 e 5 3 1 5 1 1 8 8 6 pound+

2 3 pound+ 5 7 8 8 8 1 6 5 5 5 6 6 6 6 8 I 8 6 2 50 ~ 2 3 5 8 lt) lt) lt) 8 6 2 3 5 7 7 6 6 7 8 lt) lt) 8 5 3 -

2 3 5 8 lt) A lt) 7 6 pound+ 1 8 8 1 5 7 8 8 lt) lt) 1 6 3 ~ 3 5 6 7 7 lt) lt) A A 7 5 3 1 6 8 lt) 7 5 3 5 8 lt) lt) lt) 7 3

1 pound+ 6 1 8 S lt) A lt) A 7 5 pound+ 1 3 lt) lt) 8 3 3 3 5 8 9 9 9 6 5 2 3 6 8 9 lt) lt) lt) lt) 8 lt) 8 lt) 8 6 1 A A lt) 6 7 1 8 9 lt) lt) 7 5 pound+ 2 1

0 0

25 ~ pound+

pound+

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FigA-19 Philadelphia map TMF5005

A-21

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FigA-20 Philadelphia histogram TMFSOOS

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bullbull11 FigA-21 Boston map TMF3031

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FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

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2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

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z ~ _- po vI o 0 ~ v v v ~ ~

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X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

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FigA-24 Boston histogram TMF3037

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Fig A-25 Boston map TMF3008

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FigA-18 Philadelphia histogram TMF5026

A-20

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

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FigA-19 Philadelphia map TMF5005

A-21

45

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RANGE (nmi)

FigA-20 Philadelphia histogram TMFSOOS

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100 bull bull bull r I bull I I - -

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-1-4-20480 _

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FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

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2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

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FigA-23 Boston map TMF3037

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l-4-20483 L -35 -

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2 5 ~ 01 0 e L-~ 00 Z

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Fig A-25 Boston map TMF3008

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l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

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RANGE (nmi)

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A-28

100 I bull J I I J I

l-4-2047SL

3 3 pound+ 3 1 75 ~ 2 2 1 2 6 5 5 6 6 3 -

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I I I I I - I

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FigA-19 Philadelphia map TMF5005

A-21

45

I I I I I I

-I -4-204791_ -

40

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35 -

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RANGE (nmi)

FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

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-1-4-20480 _

75 - ~- -shy

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25 C 0 ~ ~

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A-23

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A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

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FigA-24 Boston histogram TMF3037

A-26

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2 5 ~ 01 0 e L-~ 00 Z

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X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

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CENTER POINT -5 nmi 0

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~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

45

I I I I I I

-I -4-204791_ -

40

n CENTER POINT 0 10

-

35 -

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30

25

20

15

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RANGE (nmi)

FigA-20 Philadelphia histogram TMFSOOS

A-22

100 bull bull bull r I bull I I - -

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I bull I

-1-4-20480 _

75 - ~- -shy

r 50

25 C 0 ~ ~

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q t II) 6 8 8 9 f T 5 t Cgt 3 1 ~ 1 If 5 T 9 A e a 8 8 6 It 3 5 5 5 5 1 9 8 C C 8 9 8 6

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589 A A A A 9 A A A 8 If 2 368 9 9 9 9 8 899 8 6 3 156 8 8 8 8 8 988 1 7 5

1 If 5 8 8 816 8 7 5 3 3 5 6 1 716 1 1 6 3

1 3 1 1 8 IJ 8 1 5 If 1 1 5 8 8 8 6 5 2 1

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1 1

-

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I

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25

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50

I

75 100

bull x (nmi East Mag)

bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

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RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

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c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

-50 ~ 3 b b It shy5 5 2 5 3

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j I I I I I

-100 -75 -50 -25 0 25 50 75 100

X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

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CENTER POINT -5 omi 0 -

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40 50

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60

I

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FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

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2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

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5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

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bull bull

-100 I

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X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

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RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

100 bull bull bull r I bull I I - -

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I bull I

-1-4-20480 _

75 - ~- -shy

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25 C 0 ~ ~

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1 If 5 8 8 816 8 7 5 3 3 5 6 1 716 1 1 6 3

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25

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50

I

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bull x (nmi East Mag)

bullbull11 FigA-21 Boston map TMF3031

A-23

50

45

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RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

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3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

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j I I I I I

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X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

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60

I

70 I

80

I

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bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

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2 5 ~ 01 0 e L-~ 00 Z

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bull bull

-100 I

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X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

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I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

50

45

- r- I r r I I I 1 I

l-4-20481 L_ -

40 ~ -CENTER POINT -10 mni 5 mni

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RANGE (nmi)

FigA-22 Boston histogram TMF3031

bull

A-24

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

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j I I I I I

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X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

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40 50

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60

I

70 I

80

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bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

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3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

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bull bull

-100 I

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X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

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LL 0

0 15 ~ - shyw CD E shygt z

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I I II

~ I I w o 10 20 30 40 50 60 70 80 90 100

RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

100 II I I I I

l-4-20482 L

75 ~ gt shy

2 3 J 2 3 50 7 3 5 5 1 1 5 2 shy 7 7 7 b 7 8 8 7 7 8 8 8 3 5 1 8 9 9 7 b 2 1 1 8 9 9 b 5 b 7 8 9 9 8 5 2 2

2 3 ~ 5 7 b 7 8 9 9 9 8 5 2 25 1 3 3 3 b b 1 9 9 A 9 9 8 3 shygtshy

2 5 b b 1 b 7 8 8 9 A 9 8 b 2 1 2 b 8 8 7 7 8 8 A A 9 9 7

2 3 7 8 7 8 9 8 8 C 0 A 9 6 2 L

3 b 7 7 8 9 A 8 C E E 0 1 2

z ~ _- po vI o 0 ~ v v v ~ ~

3 6 7 7 7 A C 0 0 E E 8 3 5 7 1 9 8 C C C 8 8 1E

c 2 5 6 7 9 A 8 8 8 9 b 1- 2 5 7 8 9 9 8 A 7 b 3 gt- -25 - 1 2 6 7 9 9 9 8 1 5 1 1 2 2 shy

3 6 7 8 8 8 6 b I 5 3 2 3 2 1 2 5 6 7 6 7 5 3 3 5 2 1 2 1

2 3 3 2 1 1 1 5 2 2 I b 5 2

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j I I I I I

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X (nmi East Mag)

FigA-23 Boston map TMF3037

A-25

40 I I I I I I I

l-4-20483 L -35 -

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CENTER POINT -5 omi 0 -

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20

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40 50

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60

I

70 I

80

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bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

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3 5 6 6 6 6 5 5 7 6 It 6 6 7 7 7 8 9 9 8 2 5 6 7 7 8 9 8 8 9

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bull bull

-100 I

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X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

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A-27

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CENTER POINT -5 nmi 0

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RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

40 I I I I I I I

l-4-20483 L -35 -

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CENTER POINT -5 omi 0 -

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25

20

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RANGE

40 50

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60

I

70 I

80

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90 100

bull

FigA-24 Boston histogram TMF3037

A-26

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

2 bull

5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

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bull bull

-100 I

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X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

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--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

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LL 0

0 15 ~ - shyw CD E shygt z

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I I II

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RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

100 I I I l+0484Ll

-

7 5 Ishy -

bull

50 Ishy

2 5 ~ 01 0 e L-~ 00 Z

E c-gt -25 lshy

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5 5 5 6 3 2 3 3 5 5 6 6 3 5 5 It 5 5 6 7 It Ij ~ It

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bull bull

-100 I

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X (nmi East Mag)

Fig A-25 Boston map TMF3008

I

50

ll-~

75 100

A-27

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--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

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LL 0

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RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28

- -

--

I I I bull I Iii iii I I

l-4-20485 L ~30 shy

CENTER POINT -5 nmi 0

25 - shy-

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0 15 ~ - shyw CD E shygt z

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RANGE (nmi)

bull FigA-26 Boston histogram TMF3008

A-28