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Multichannel Sense-and-Avoid Radar for Small UAVs

Multichannel Sense-and-Avoid Radar for Small UAVs. Acknowledgements. Funding sources NASA – Leading Edge Aeronautical Research for NASA (LEARN) Madison & Lila Self Graduate Fellowship, KU Researchers Dr. Christopher Allen (PI) – Electrical Engineering Professor at KU

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Multichannel Sense-and-Avoid Radar for Small UAVs

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  1. Multichannel Sense-and-Avoid Radar for Small UAVs

  2. Acknowledgements Funding sources NASA – Leading Edge Aeronautical Research for NASA (LEARN) Madison & Lila Self Graduate Fellowship, KU Researchers Dr. Christopher Allen (PI) – Electrical Engineering Professor at KU Dr. Mark Ewing – Aerospace Engineering Professor at KU Dr. ShahriarKeshmiri – Aerospace Engineering Professor at KU Graduate students Lei Shi, Mike Zakharov, Francisco Florencio, NahalNiakan, Robert Knight On-campus technical support Instrumentation Design Lab (IDL): Dr. Ken Ratzlaff, Robert Young

  3. Project Background

  4. System Specifications Platform – 40%-scale Yak-54 RC aircraft Sensor requirements • detection range 300 to 800 m • range accuracy 10 m • range-rate resolution 1 m/s • Doppler accuracy 10 Hz • update rate 10 Hz • field of view: azimuth – 360°elevation – 15° • angular accuracy 3°

  5. FPGA processing example results Emulated target signal 108 dB power 512.7 Hz Doppler 305.9 kHz beat freq 3-D graphic output Loopback setup with leakage using 800-m fiber delay line (584 m range), Input signal power -112 dBm, 500-Hz double-sideband modulation, output plot truncated in range and Doppler. Leakage Noise floor 85 dB Carrier Loopback anomaly

  6. Implementation – Radar Block Diagram • Radar-ready ICs: FMCW synthesizer & multichannel ADC • FPGA • RF subassembly • Antenna arrays

  7. Implementation – Digital System

  8. Implementation – RF subassembly Low Noise Amplifiers (LNA) SAW filter (surface acoustic wave) Splitters Mixers • One transmit channel • Transmit power ~ 0.5 W • Five receive channels • Receiver noise figure 3.5 dB • Receiver gain 64 dB • Weight approx 50 lbs • Size approx 1 m2 Low Pass Filters (High pass filters not shown) Power Amplifier

  9. Current Project Status • Radar prototype is being flight tested on Cessna Aircraft

  10. 502 Project – TX/RX Miniaturization • Miniaturize the radar to fly on the 40% Yak-54 UAV. • System target weight ~ 4 lbs • System target size ~ 8”x8”x8” (exact values are TBD) • Miniaturization will necessitate custom printed circuit assembly and possibly migration to a higher microwave frequency.

  11. 502 Project – Skills to be Developed/Used • High Frequency Circuit Design and Construction • PCB layout – Eagle CAD preferred • PCB construction using (small) surface mount components (SMCs) • RF chain characterization – oscilloscopes, network analyzers, etc. • Trouble shooting • MATLAB (maybe)

  12. You should consider this project if you… • Need to reinforce fundamental EE skills for industry or graduate school • Are interested in Radar systems • Want to participate in cutting-edge research • Like to make Aerospace Engineers happy • Haven’t had enough of working with Dr. Allen or myself

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