1. SENIOR PROJECTS LABORATORY ECE 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. Specs 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

6. Sidelobes 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. http://en.wikipedia.org

7. Configuration LAP3000 RADAR RECEIVER

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

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

10. Schedule

11. Action Items ACTIONWHODUEDONE Pick Parts and SpecificationsMichael/Rafael/Micah1-Mar X PurchaseMicah/Michael/Rafael2-MarX Measure BackscatterKari/Micah/Michael/Rafael4-MarX Measure Signal StrengthKari/Micah/Michael/Rafael4-MarX Measure Power loss in 100 ft. SMARafael/Micah/Michael/Kari10-MarX Prepare MaterialsKari10-MarX Organize ScheduleMicah/Kari10-MarX Construct CircuitRafael14-AprX

12. Cost Comparison Analysis Cost Allowance$3000.00 Initial Target$2500.00 Initial Cost Estimate$2200.00 Final Cost$2239.65

13. Schedule Comparison Analysis Estimated Work Hours Actual Work Hours Difference%Expended Kari186173-1393% Rafael243234-996% Micah216168-4878% Michael22524621109% Total Hours870821-4994%

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