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SENIOR PROJECTS LABORATORY ECE 4773

SENIOR PROJECTS LABORATORY ECE 4773. Team 5B: Side Lobe Canceller. Micah Nelson Rafael Mendoza Kari Gammons Michael Lee. PROJECT Sidelobe Canceller for a 915 MHz Atmospheric Radar MENTOR(S) Dr. Bob Palmer Dr. Tian Yu Chad Kidder OBJECTIVE

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SENIOR PROJECTS LABORATORY ECE 4773

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  1. SENIOR PROJECTS LABORATORYECE 4773 Team 5B: Side Lobe Canceller Micah Nelson Rafael Mendoza Kari Gammons Michael Lee

  2. PROJECT • Sidelobe Canceller for a 915 MHz Atmospheric Radar • MENTOR(S) • Dr. Bob Palmer • Dr. Tian Yu • Chad Kidder • OBJECTIVE • Research, design, and build a sidelobe canceller, SLC, which will receive interference, known as clutter, caused by sidelobes from the LAP-3000 RADAR system

  3. Design Approach • Design was developed to be compatible with the LAP-3000 radar • Design of receiver based on the LAP-3000 receiver design

  4. Vaisala LAP-3000 RADAR • Lower Atmosphere Doppler Wind Profiler • Used for weather applications Clutter Screen is Absent

  5. Measurement height Min = 100 m for wind Min = 100 m for temp Max = 2 to 5 km for winds Max = 1 to 2 km for Temp Min Vertical Resolution 60 m for wind 60 m for temp Radar Frequency 915 MHz Specs

  6. Side lobes are part of the radiation pattern from the radar that are not the main beam. The power of the side lobes is normally much less than the power of the main beam of the radar. Sidelobes http://en.wikipedia.org

  7. Configuration RECEIVER LAP3000 RADAR RECEIVER RECEIVER RECEIVER

  8. System Block Diagram 15’ ANTENNA 915 MHz 10 dBm 36 V DC 2 A 855 MHz Receiver Box + + 855 MHz _ _ IF 60 MHz 60 MHz 100’ Inside Structure Indoor Box DC 60 MHz AC I Q I Q Baseband

  9. Receiver Block Diagram AMP 60 MHz 915 MHz MIXER BANDPASS FILTER BANDPASS FILTER LIMITER PREAMP Recommended AMP 855 MHz 60 MHz QUADRATURE DETECTOR LOCAL OSCILLATOR IF/Detector Dual Matched Bessel Filters LOWPASS FILTER LOWPASS FILTER I Q Baseband

  10. Schedule

  11. Action Items

  12. Cost Comparison Analysis

  13. Schedule Comparison Analysis

  14. Recommendations • Baseband may be amplified as needed • Digital accounting for difference in magnitude of I and Q output signals may be done • A limiter may need to be added to the design immediately after the antenna for added protection • System gain can be reduced to remedy Intermodulation that may occur at higher dBm ranges such as signals greater than -40 dBm • Variable attenuators may have better results for future use as a replacement for fixed attenuators

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