11

Electronic Warfare Digital Radar Electronic Warfare Digital Radar ReceiverReceiver

By:

Peter Petrany & Michael Gahl

Advisors:

Dr. Huggins, Dr. Ahn

& Mr. Jim Jensen

Bradley University Peoria, IL

Department of Electrical and Computer Engineering

22

OutlineOutlineBackground/TheoryBackground/TheoryProject StatementProject StatementTop level Block DiagramTop level Block DiagramRF Front end (with PLL)RF Front end (with PLL)FFT to find RF signal characteristicsFFT to find RF signal characteristicsSimulink Simulation Simulink Simulation Division of Labor (schedule)Division of Labor (schedule)

33

BackgroundBackgroundWhat is an EWDigRec?What is an EWDigRec?

Receives unknown RF signalReceives unknown RF signal

Determines characteristicsDetermines characteristics

What are the Applications?What are the Applications?

National DefenseNational Defense JammingJamming Spoofing Spoofing

44

Project Statement Project Statement Develop RF front end to receive RF signal and sample with DAQ

From FFT of sampled data, generate RF characteristics

55

Top Level Block DiagramTop Level Block Diagram

00 01 10 11

66

CharacteristicsCharacteristics

RF frequency (RF frequency (ffRFRF))

Pulse Width (PW)Pulse Width (PW)

Pulse Repetition Rate (PRR)Pulse Repetition Rate (PRR)

fRF

PW

1/PRR

77

Sub Level Block DiagramSub Level Block Diagram

88

Sub Level Block DiagramSub Level Block DiagramIF

LNA- receives RF signalLNA- receives RF signalPLL- produces LO frequencyPLL- produces LO frequencyMixer- downconverts RF signalMixer- downconverts RF signal IF- sampled by DAQIF- sampled by DAQ

99

Locating FFTLocating FFT

1MHz 5MHzIF Range

1010

Sub Level Block DiagramSub Level Block Diagram

1111

Sub Level Block DiagramSub Level Block Diagram

DAQ- samples IF signalDAQ- samples IF signal DSP- performs FFT and extracts DSP- performs FFT and extracts RF characteristics RF characteristics

Monitor- displays RF characteristics Monitor- displays RF characteristics and signal detection and signal detection

1212

Finding RF Characteristics via FFTFinding RF Characteristics via FFT

(1)

(2)

(3)

w(t)

p(t)

s(t)=w(t) p(t)

1313

Finding RF Characteristics via FFTFinding RF Characteristics via FFT

Time Domain

Time Domain

Frequency Domain

Frequency Domain

1414

Finding RF Characteristics via FFTFinding RF Characteristics via FFT

1515

Finding RF Characteristics via FFTFinding RF Characteristics via FFTCHARACTERISTICS

1

2

3

1616

Finding RF Characteristics via FFTFinding RF Characteristics via FFTCHARACTERISTICS

1

2

3

PRR=

= 0

= 1= PW1

1717

RF signalRF signal

SimulinkSimulink

PW = 0.1 sfRF=33.3 Hz

1919

fRF = 33.33 Hz

PW = 0.1 s

PRR = 0.5 s

2020

FlowchartFlowchartADC Samples

FFT

Calculate RF Signal

Characteristics

Is signal detected?

Display fRF, PW, PRR

Increment LO

Specify CNTRL

Yes

No

2121

FlowchartFlowchartADC Samples

FFT

Calculate RF Signal

Characteristics

Is signal detected?

Display fRF, PW, PRR

Increment LO

Specify CNTRL

Yes

No

Decision

Signal has been detected

No signal detected

Is maximum peak ≥

threshold?

Is |fIF + f01| = | fIF - f02 |

?

Display Characteristics

No

Yes

Yes

No

Increment LO

Display “No Signal Detected”

2222

Fast Fourier Fast Fourier Transform (FFT)Transform (FFT)

2323

fIF = 33.33 Hz

1/PW = 0.1 s

PRR = 0.5 s

2424

Schedule of LaborSchedule of LaborSchedule

Week Task Project Member

Winter BreakResearch & order parts: DAQ, LNA, Mixer, PLL componentsResearch PLL

BothMichael

Week 1Jan 24 – 28

Learn to operate the signal generator (sig. gen.) & spectrum analyzer Both

Week 2 – 3Jan 31 – Feb 11

Learn operation of DAQ board & begin testing w/ computer & sig. gen.Begin building & testing RF front end w/ sig. gen. (excluding PLL)

PeterMichael

Week 4 – 5 Feb 14 – 25

Continue writing & modifying MATLAB simulation w/ noiseBuild & test PLL

PeterMichael

Week 6 – 8Feb 28 – Mar 11

Mar 21 - 25

Research & implement DSP techniques into MATLAB simulationContinue building & testing PLL, integrate into RF front end

PeterMichael

Week 9 – 10Mar 28 – Apr 8

Implement Processing Control Commands into MATLAB codeImplement tunable portion of PLL (programmable divider)

PeterMichael

Week 11Apr 11 – 15

Integrate RF front end w/ software side Both

Week 12 – 13 Apr 18 – 29

Prepare for final report, student Expo, & presentation Both

Week 14May 3

Presentation Both

2525

QuestionsQuestions

Bradley University Peoria, IL

Department of Electrical and Computer Engineering

By:

Peter Petrany & Michael Gahl

Electronic Warfare Digital Radar Electronic Warfare Digital Radar ReceiverReceiver