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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
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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)
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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
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Project Statement Project Statement Develop RF front end to receive RF signal and sample with DAQ
From FFT of sampled data, generate RF characteristics
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Top Level Block DiagramTop Level Block Diagram
00 01 10 11
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CharacteristicsCharacteristics
RF frequency (RF frequency (ffRFRF))
Pulse Width (PW)Pulse Width (PW)
Pulse Repetition Rate (PRR)Pulse Repetition Rate (PRR)
fRF
PW
1/PRR
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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
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Finding RF Characteristics via FFTFinding RF Characteristics via FFT
(1)
(2)
(3)
w(t)
p(t)
s(t)=w(t) p(t)
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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
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Finding RF Characteristics via FFTFinding RF Characteristics via FFTCHARACTERISTICS
1
2
3
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Finding RF Characteristics via FFTFinding RF Characteristics via FFTCHARACTERISTICS
1
2
3
PRR=
= 0
= 1= PW1
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RF signalRF signal
SimulinkSimulink
PW = 0.1 sfRF=33.3 Hz
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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
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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”
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Fast Fourier Fast Fourier Transform (FFT)Transform (FFT)
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fIF = 33.33 Hz
1/PW = 0.1 s
PRR = 0.5 s
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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
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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