Guidance Systems Division

GEC Avionics Limited comprises a group of divisions situated at Rochester, Borehamwood, Basildon, Milton Keynes and Nailsea, specialising in all aspects of aviation instrumentation and control. The Guidance Systems Division situated at Rochester is responsible for the development and production of precision gyros, accelerometers, sensor assemblies, Strapdown Attitude Reference and Navigation Systems including Power Supplies, Output Processing Electronics and Computing.

GI-G6 Gyro

In line with GEC Avionics policy, developing technology has produced extremely successful Strapdown Inertial Reference Systems, and future design requirements for programmes of the 80's and 90's, dictate the need for the G 1- G6 precision single axis torque Subminiature Rate Integrating Gyroscope.

Introduced in 1970, this gyroscope has become a designer's standard. Its high performance and reliability under adverse environments, and its ability to be produced at low cost have enabled it to be specified on many US and European programs. It is estimated that the GI-G6 supplies more than two thirds of the entire US market for subminiature rate integrating gyros.

European applications associated with the GI-G6 Gyro include the stabilisation of shipborne communication antennae, weapon aiming systems for aircraft, ships, tanks and missiles, advanced fly- by-wire flight controls, guidance systems for underwater weapons and navigation systems for land vehicles.

Many different models of the basic GI-G6 Gyro have been built to satisfy the varying application requirements of our customers. Some models feature very low drift rates - between 10' and 15' /hr over a temperature range of about 100' F (55' C). Some are capable of performing at around l ' /hr when kept at a constant temperature and under steady state conditions such as exist in a gimballed platform. Other models are designed to operate over temperature ranges of up to 300' F (149' C) with a drift rate of between 10' & 20' /hr.

Chafing Cross

River Medway

Margale

A2

Dover

N

t Folkestone

A20

Hastings

Gyro Selection

Gyro selection is usually a compromise between performance and cost. Obviously the best gyro will have optimum features in all of its sub­component elements, ie, spin motor, torquer, damping etc., but for a given application certain best features may, conflict with those of others. For instance, a larger angular momentum wheel clearly gives superior drift performance, but time taken to reach synchronisation, and/or cost to incorporate a new spin motor into the gyro assembly may be unacceptable.

An important aspect of this selection process is a thorough discussion with the gyro manufacturer during the establishment of the system error budget. Such discussion often reveals for instance, that the system will allow for the use of an existing gyro that is produced on the assembly line in large quantities, and can therefore be procured at substantially less cost than if it had to be tailored to a prespecified set of conditions. It is therefore most advantageous to consider cost driving factors during the early phases of system design.

Typical GI-G6 performance characteristics are given in the following pages. These models have in common many of the sub-components previously mentioned, and in general use the same assembly and test facilities, thereby keeping costs to a minimum.

Various specifications are available on request and we would be pleased to quote against your specific requirements. For further information please contact the Guidance Systems Division Sales Office.

Output Axis

Output Axis Bearings

Motor

Input Axis

6 po,;I;,.

I Rolol;oo

G Spin ReI

Ax is

Bellows

Damping Control

Typical GI-G6 Characteristics

Parameter Units

Spin Motor Vollage Volts RMS

Frequency Hz

Power

Slart

Run

Angular Momentum gm -cm2/ sec.

Sync Time, Room Temp sec.

Signal Generator Vollage Volts RMS

Frequency Hz

Load Ohms

Phase Shift deg.

Sensitivity VoltS/rad.

Null mV (max.)

Torque Generator Maximum Torquing Rate

Continuous °/ sec.

Intermittent °/ sec.

Resistance Ohms

Scale Factor o/ sec/ mA

Linearity %

Gyro Performance Transfer Function Volts/ fad.

Time Constant msec.

lA Freedom ± deg

Drift Rates - Maximum

G-Insensitive "/ hr.

G-Sensitive o/ hr/ g

Anisoelastic o/ hr/ r/

Noise pIad.(max.)

Environments Operating Temperature of

Shock g, msec.

Vibrat ion 9 RMS

Hz

310C

27.4

400

4.5W

3.5W

32,000

60

10

4800

10 k

± 7

24

10

75

20 0

145

1.0

0.1

11 .5

1.0

2 -3

27

25

1.8

6 (10 240 Hz)

-5010+240

100, 11

38

20-2000

65781CI E

26

400

3.8W

3.5W

18,500

10

8

4000

lOk

±5

29.5

10

125

200

50

0.6

0.1

17.9

1.0

0.6-1.2

40

40

4

6(10 240 Hz)

- 5010+212

50, 11

19.2

10-2000

650C

52/26

400 + 3%

25W

3W

18,500

6

10± 5%

4800 ± 3%

10k

+ 5 ± 7

29

25

75

60 0

60

0.6 ± 1%

23± 25%

1.1

72

65

3.6

15

-5010 +240

50,11

20

20-2000

650E

26

400

sw 4W

18,500

30

8

5000

10 k

± 10

23

5

105

200

50

0.6 ± 5%

0.03"/sec. or 0.25%

18 ± 15%

1.0

2

40

30

2

15

- 25 10 + 165

50 , 11

20

20 -2000

65 1 N J

26

800

sw 4W

25,500

20

8

4800

10 k

±10

19

5

105

200

45

0.4

0.25

14

1.25

2 - 3

40

30

2

6 (10 240 Hz)

-5010 + 200

100, 11

30

20 -2000

6518

30

400

sw 4W

32 ,000

30

8

4800

10k

±10

19

5

105

200

108

1.25

0.25

19

1.25

2 - 3

40

30

2

6(10240 Hz)

- 5010 + 200

100, 11

30

20 -2000

65 10

30

400

sw 4 W

32,000

20

8

4800

10k

± 10

19

5

105

200

105

1.2

0.25

19

1.25

0.7

40

30

2

15

-50 10 + 200

100, 11

30

20 -2000

651 E

30

400

sw 4W

32,000

20

8

4800

10k

± 10

19

5

105

200

105

1.2

0.25

19

1.0

40

30

2

15

- 50 10+200

100, 11

30

20 -2000

653A

26

400

sw 4W

32,000

30

8

4000

10k

± 12

29.5

10

75

60

0.35

0.25

18

1.1

0.9- 1.8

30

25

2

6 (10240 Hz)

- 5010 +200

100, 11

30

20 -2000

654A

19 .4

400

sw 3.5W

11 ,000

12

10

3840

952

0+5

12.3

10

200

230

2.0

2.5

0.5

0.35- 1.2

60

50

2

15

+3210 + 122

50, 11

22

20 -2000

3408

26

800

4.5W

2.5W

32,000

60

342A

26±3%

400 ± 5

3.5W

3W

32,000

10

2 4.5

3280 400

1Ok, 0.027 I'F lOk

± 35 +72

7.5 3.6

5 10

40 75

150

100 85

1.0 0.63

0.5

7.5 3.4

1.0 1.25± 35%

1.0-2.0 2

54 25

36 25

1.8 2

6 (10240 Hz) 15

+4010 + 160 - 40 10+ 160

50, 11 50, 11

22 22

20 -2000 20 -2000

Note 1

This specificat ion data lists typical customer requirements for the G , - G6 gyro, and therefore some mode ls a re capable of ac hieving a higher pe rforma nce tha n that stated here. Where the gyro is used in a microprocessor based system, considerable performance improveme nts can be made by the use of digita l characterisation tec hniq ues. To date some 180 variants of this sensor have bee n produced covering a wide range of applica tions a nd specification requirements. Min imum costs and de livery time can therefore be achieved by se lecting from those gyros curre ntly in volume production. For further information please contact the Gu idance Systems Division Sales Office.

Note 2 The GI-G6 -031 variant refers to a long life, low noise gas bearing spin motor gyro.

Design Notes

• Minimum noise performance is ensu red by :-(1) Sine wave drive to the spin motor (2) Driving the signal generator with a

high RMS voltage which reduces subsequent capture loop gain requirements

• Performance over temperature range High angular momentum, high rate range and high performance G 1- G6 gyros employ Samarium Cobalt magnets in the torque generator. To offset the variation of magnet performance with temperature, compensating networks are fitted into the gyro

• Signal Generator The signal generator is optimised for operation at 4 .8 kHz and-provides minimum phase shift at this frequency. However operation over the range 400Hz to 12.8 kHz is possible

• Mounting Flange Index notch aligned to input axis to within 3 milliradians as standard. Higher accuracy optional

• Lead/ Pin Functions Two phase motor.

Pin No. Function

1 Torquer Hi 2 Torquer Lo 3 Microsyn Pri H i 4 Microsyn Pri La 5 Molor-Iead </>A 6 Motor-common 7 Microsyn Sec Hi 8 Microsyn Sec La 9 Molor- </> B 10 Case-ground 11 12

Typical GI·G6 Characteristics

Parameter Units

Spin Motor Vollage VolIs RMS

Frequency Hz

Power

Slart

Run

Angular Momentum gm-cm2/ sec.

Sync Time, Room Temp sec.

Signal Generator Voltage

Frequency

Load

Phase Shift

Sensitivity

Null

Torque Generator Maximum Torquing Rate

Continuous

Intermittent

Resistance

Scale Factor

linearity

Gyro Performance Transfer Function

Time Constant

lA Freedom

Drift Rates - Maximum

G·I nsensitive

G-Sensitive

Anisoelastic

Noise

Environments Operating Temperature

Shock

Vibration

Volls RMS

Hz

Ohms

deg.

VolIS/rad.

mV(max.J

a/sec. o/sec.

Ohms

°/ secl mA

%

VolIS/rad.

msec.

±deg

"/ hr.

"/hr/g

"/ hr/ r!

!'fad.(max.)

g, msec.

gRMS

Hz

343A

70

900

600mA

400mA

36,000

10

20

4000

10k, 500 pF

±5

46

20

60

100

50

0.6

0.1

17.2

1.05

0.5-3.0

12

18

0.3

6 (10 500Hz)

- 30 10 +165

50, 11

10

5-500

346A

24/ 12

1600

16.5W

0.9W

50,850

6

8

4800

10k

O± 10

19

5

60

45

0.35 ± 1%

0.2

19

0.75± 30%

10

10

2

15

010+118

100,11

15

20-2000

321A

7.0

900

600mA

400mA

57 ,200

60

20

4000

10k, 500pF

±3

24

10

60

90

108

0.6

1.0

10

0.6 Nom.

2-3

12

18

0.3

6(10500 Hz)

-5010+220

80, 11

10

20-2000

321C

7.0

800

SW

4W

51 ,000

30

8

9600

10k

- 18

19

10

75

100

108

0.6

0.2

12

0.6

2-3

15

15

10 (10 450 Hz)

-6710+149

80,11

10

20 -2000

321E

7.0

900

7W

4W

57,200

30

8

9000

10k

±5

8

6

60

75

108

0.8

0.1

8

0.5

2-3

10

10

10(10150 Hz)

+4110+167

80, 11

10

20-2000

321F

7.0

900

SW

3W

57,200

30

8

9000

10k

±7

B

6

60

75

130 max.

0.6

0.1

8

1.0

2-3

15

15

0.5

10 (10 2000 Hz)

+32 10+131

80, 11

10

20 -2000

321G

'\ 7.0 787.5

J

6Wmax.

50,050

30

B± 10%

3937.5± 2%

10k

O± 10

10

60

lOB

0.834± 10%

15±20%

1.2±20%

2-3

40

12

0.5

15

-2010+ 136

80, 11

10

20 -2000

321H

7.0± 0.5

900± 0.5%

7W

4W

57 ,200

30

8± 1.0%

9000

10k

0±5

8

6

60

75

125 rnax.

0.6± 1%

0.1

8± 10%

1.0± 10%

2-3

10

15

10(101-2000 Hz)

-6510+167

80,11

10

20-2000

337A

12

800

2.7W

1.3 W

12,750

15

4

3200

IOk

0±5

9

10

400

800

346

6.0

0.05"/sec orO.5%

3.5

1.05± 35%

2-3

50

60

2

15

+ 40 10 +160

80,1 1

10

20-2000

3208

28.5/13.0

1488

1400 mA

170mA

20,500

1.75

5

5950

10k

± 10

10-15

2

60

260

35

0.4

0.05

4.0

0.75

3-6

35

25

0.4

6(10500 Hz)

+4510+125

100,6

12.3

20-2000

320C

28/ 13

1488

1600 mA

170 mA

20,500

1.75

5

5950

10k

±10

12.5

2

60

150

35

0.4

0.05

4.0

0.75

3-6

25

15

0.4

6 (10 500 Hz)

+4010 +140

100, 6

12.3

20-2000

3258

42/35

3200

8.5W

2.1 W

24,600

B

3.75

4800

10k

±10

9

20

30

N/A

4.2

0.1

0. 1

40

6

0.5

8

8

0.2

6(10500 Hz)

+170

50, 11

8

20-2000

Note 1

This specification data lists typical customer requirements for the G 1- G6 gyro, and therefore some models are capable of achieving a higher performance than that stated here. Where the gyro is used in a microprocessor based system, considerable performance improvements can be made by the use of digital characteri sation techniques. To date some 180 variants of this sensor have been produced covering a wide range of applications and specification requirements. Minimum costs and delivery time can therefore be achieved by selecting from those gyros currently in volume production. For further information please contact the Guidance Systems Division Sales Office.

Note 2 The GI-G6-031 variant refers to a long life, low noise gas bearing spin motor gyro.

Design Notes • Minimum noise performance is

ensured by:-(1) Sine wave drive to the spin motor (2) Driving the signal generator with a

high RMS voltage which reduces subsequent capture loop gain requirements

• Performance over temperature range High angular momentum, high rate range and high performance GI-G6gyros employ Samarium Cobalt magnets in the torque generator. To offset the variation of magnet performance with temperature, compensating networks are fitted into the gyro

• Signal Generator The signal generator is optimised for operation at 4.8kHz and-provides minimum phase shift at this frequency. However operation over the range 400Hz to 12.8kHz is possible

• Mounting Flange Index notch aligned to input axis to within 3 milliradians as standard. Higher accuracy optional

• Lead/Pin Functions Two phase motor.

Pin No. Function

1 Torquer Hi 2 TorquerLo 3 Microsyn Pri Hi 4 Microsyn Pri Lo 5 Molor-Iead q,A 6 Motor-common 7 Microsyn Sec Hi 8 Microsyn Sec Lo 9 Molor-q,B 10 Case-ground 11 12

Typical GI·G6 Characteristics

Parameter Units

Spin Motor Vollage Volts RMS

Frequency Hz

Power

Slart

Run Angular Momentum gm-cm2/sec.

Sync Time, Room Temp sec.

Signal Generator Vollage

Frequency

Load

Phase Shift

Sensitivity

Null

Torque Generator Maximum Torquing Rate

Continuous

Intermittent

Resistance

Scale Factor

Linearity

Gyro Performance Transfer Function

Time Constant

lA Freedom

Drift Rates - Maximum

G -Insensitive

G-Sensitive

Anisoelastic

Noise

Environments Operating Temperature

Shock

Vibration

Volts RMS

Hz

Ohms

deg.

Volts/rad.

mV (max.)

O/ sec.

o/ sec.

Ohms

c/ sec/ mA

%

VoltS/rad.

msec.

±deg

"/ hr.

"/ hr/ g

"/ hr/ r!

",ad. (max.)

"F

g, msec.

gRMS

Hz

326C

30/ 15

1250

6VA

4VA

17,200

2

9

3125

20k

±14

25

6

10

200

350

1.75

0.3

15

2.0

2.5- 5.0

30

15

0.8

6(10240 Hz)

+ 14010+185

85, 5

11,4

50-2500

329B

28.5/13

1498

3000mA

300mA

20,500

1.75

5

4800

10k

±7

12

6

40

150

35

0.33

0.3

5.5

0 .7

3 - 6

15

10

0 .2

6(10500 Hz)

+130/0+150

40, 11

5.4

20-2000

344B

30/20

1563

6W

1W

21,500

6

4 .2

6250

10k

±1O

13

6

175

185

425

2.7

0.015 "/sec

4.0

1.3

0.5-1.0

50

15

1.0

6 (10 500 Hz)

+4010+185

50,11

35

10-2000

367A

28.1/ 13

400

50W

3.5W

9250

0.8

30

4800

10k

±7

116

TBD

525

80.5

3.14

0.2

27

0.68

± 4

290

176

1.8

+510+160

35,30

15

20-2000

353B

16.8

400

5.1 W

4W

24000

60

12

6567

10k

10 ± 15

30

25

205

291

2.38

0.3

9.9

0.48

±4.5

100

100

1.8

+4010 +225

30,30

10

20-2000

342C

26

400

3.5W

3W

32,000

20

4.5

400

10k

72

3.6

10

60

120

28.1

0 .69

4

3.4

1.25

25

25

-2610+160

30,11 See Customer Spec

100-2000

355A

17

800

4.4 W

4W

7 127

50

5

12.8

10k

9

200

253

7.14

1.5

3.7

2.0

122

104

-6510+203

MIL-STD-810B Melhod516

MIL-STD-8 10B Method 514

321M

7

875

6.5W

5W

55611

30

7

4375

lOk

±5

9 .0

4

80

12 1

0.75

10

0 .86

12

12

0 .5

-24 10+160

MIL-STD-81 OB

M I L -STD-8 1 OB

351A

6 .5

893

600mA

1.2 W/ Leg.

357 20

60

7

4465

lOk

10

16

20

60

120

58

0 .62

0 .1

10

1.0

20

30

2

10

150 ± 2

031 Gas bearing, low noise

28

5000

10W

2.75 W

32,000

20

7

5000

lOk

5

17

14.3

115

N/A

69

0 .729

0 .34

17.94

1.2

± 14

15

14.2

TS-2858

+140

15,11

2

10-2000

Note 1

This specification data lists typical customer requirements for the G I · G6 gyro, and therefore some models are capable of achieving a higher performance than that stated here. Where the gyro is used in a microprocessor based system, considerable performance improvements can be made by the use of digital characterisation techniques. To date some 180 variants of this sensor have been produced covering a wide range of applications and specification requirements. Minimum costs and delivery time can therefore be achieved by selecting from those gyros currently in volume production. For further information please contact the Guidance Systems Division Sales Office.

Note 2 The GI·G6·031 variant refers to a long life, low noise gas bearing spin motor gyro.

Design Notes

• Minimum noise performance is ensu red by:-(1) Sine wave drive to the spin motor (2) Driving the signal generator with a

high RMS voltage which reduces subsequent capture loop gain requirements

• Performance over temperature range High angular momentum, high rate range and high performance G I· G6 gyros employ Samarium Cobalt magnets in the torque generator. To offset the variation of magnet performance with temperature, compensating networks are fitted into the gyro

• Signal Generator The signal generator is optimised for operation at 4.8kHz and-provides minimum phase shift at this frequency. However operation over the range 400Hz to 12.8kHz is possible

• Mounting Flange Index notch aligned to input axis to within 3 milliradians as standard. Higher accuracy optional

• Lead/Pin Functions Two phase motor.

Pin No.

1 2 3 4 5 6 7 8 9 10 11 12

Function

TorquerHi Torquer Lo Microsyn Pri Hi Microsyn Pri La Molor-Iead q,A Motor-common Microsyn Sec Hi Microsyn Sec Lo Molor-q,B Case·ground

Typical GI-G6 Configurations

Mounting Flange and Flying Leads (Standard)

Mounting Flange and Header Pins (Alternative)

Basic Outline (Alternative)

Gyro Circuit Diagram

This document gives only a general description of the product(s)

and shall not form part of any contract. From lime to time and without prior notice, changes may be made in the product(s) or in the conditions of supply,

Manufactured under licence from Northrop Corporation USA

,

SRA

45'--+

IA +~1If~-

063 +·001 . -0

1 lA .002

.. , , Shielded C 6.0 ± .2SL o""~

I~

OA

2.4 Max.Ret.

0 .01 x4S"Chamfer Label /

nl -

1.0 1.296 + 0 +0 - .001 -.003

.125± .OlO-..j r,-'::::'lu,=llI

12 Terminals .03 DIA EQl S P On .75 PCD

SRA .085 ~ :gJ

C~ 00 oop :..

- -13-iIRff--lA --: T' • .062 ± .002 r~~~~~ Input Notch

Optional

OA r ~

Pln2

SRA .085 ~2~

2 Holes 0-80 UNC Thread EOl S P 0

Al"!""",, .850 PGD x .085 De

12 Termlnals.o3 DIA EOl SP On .75 PGD .;1

TorQuer

2

Pin 1

Pin 2

Signal Generator

4 3 8

ep :..

OA r ~

lJ(J PRI SEC

I'

I'

5

Dimensions In Inches

2.25SMsx. Ref.

2.2 Max.Ref.

O~OI X45' Label

Chamfer /

t i t 1.0 1.1 5

-- _ +0 +0 - .001 -.00

OIA OIA

.=--.l -.. . 125±.D10 --..J "";1100 To 1 t

Gusl . Spec.-..j 1. A .0005 ·A·

Dlmensionsinlnches

2.255 Mo< Rel.==::I

2.2 Max. Ref. ,

Label

/ ~ i

1.0 +0 - .001

OIA

---±.

Dimensionsin Inches

Spin Molor

6 9

* Optional 3 Phase M olol

Ground

10

1 " o

12 o

GEC AVI()NICS

GI-G6-317Y RATE INTEGRATING GYRO

PERFORMANCE CHARACTERISTICS

DRIFT SPIN MOTOR G-In sensitive 40' / hr Excitat ion 30v RMS, 400 Hz

Slabi lily (1 Sigma) 10' / hr Waveform Sine or Square G-Sensitive, per axis 30' / hr/ g Power, Starting 5 watts, max

vector sum 40' / hr/g Running 4 watts, max

Stabili ty (1 Sigma) 8 ' / hr/ g Phases 1, 2 or 3

G2-Sensitive 2' / hr/ g' Sync Time, Room Tempera ture 30 sec, max (2 or

Random 2' / hr 3-Phase Operation) Angular Momentum 32,000 gm-cm2/ sec

PICK-OFF GYRO TRANSFER FUNCTION Excitation 8v RMS, 4800 Hz At Room Temperature 19v RM S/rad ± 20% Load 10K ohms Variat ion from Room Temperature Phase Shift o ± 10 degrees o to + 200" Current 12.5 ma, typica l - 50 to O' F

DAMPING COEFFICIENT TORQUER Torquing Rate, (2 sec ON, CHARACTERISTIC TIME

20 sec OFF) 200' / sec Torquing Rate, Continuous 105' /sec ENVIRONMENTS Sca le Factor 1.25°/ sec/ ma ± 20% Tempera ture, Storage Scale Factor Tempe rature Operating

Coefficient 0.025%I'F Random Vibration Linear ity 0.03"/ sec or 0.25% Shock

of readi ng Linear Acceleration Resistance 108 ohms Slew Rate Capability

OUTLINE

SI" Sp,n Motor T~","

= "R' T2

" , , , , IYl l?: , llll~~ -tlHt~-+ IA

GyfO Tllfmr.:J!S

GEC AVIONICS GEC Avionics Limited Airport Works Rochesler Kent ME t 2XX Telephone : Medway (0634) 44 400 Telex 96333/4

Guidance Systems Division

o to + 15% Plus 20%, Minus 50%

32,000 dyna-cm/ rad/sec

1.0 msec (nominal)

- 65 to + 250"F -50 to + 200' F 30g RM S, 20 • 2000 Hz 1 OOg, 11 msec, Sawtooth 50g 20 rad/sec

Th is document gives only a general descript ion of the product(sl and shall nOI form part of any contract. From time to time changes may be made in Ihe ploduct!s) or in the conditions of supply.

429A