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Developing a Dual-Frequency  FM-CW Radar to Study Precipitation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],This work is supported: University of Colorado at Boulder CIRES Innovative Research Program With collaborations from  Paul Johnston and David Carter
Motivation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Technology & Methodology ,[object Object],[object Object],[object Object],[object Object],[object Object]
Presentation Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Hardware Layout
Antennas in my backyard (an understanding wife) C-band Antennas – 5.8 GHz X-band Antennas – 10.4 GHz Antennas are designed for point-to-point Internet service
Hardware Layout Costs for C-band Radar ~$US 6k
Simplified Tx and Rx Schematic
Timing Diagram: Frequency Chirp and Data Collection Trigger f 0 f 1 B = f 1  - f 0 Frequency Chirp Data Collection Trigger T delay T dwell T end T wait T IPP   T sweep   Sweep Trigger Data is being collected
Timing Equations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Range Equations ,[object Object],Target Tx Rx R
Range Equations ,[object Object],Target Tx Rx R f 0 f 1 B = f 1  - f 0 T sweep   Tx
Range Equations Target Tx Rx R f 0 f 1 B = f 1  - f 0 T sweep   Tx Rx For a linear FM signal, a hard target located at range  R  will generate a delayed version of the transmitted signal  t  = 2 R / c  seconds later.
Range Equations ,[object Object],Target Tx Rx R f 0 f 1 B = f 1  - f 0 T sweep   Tx Rx
Range Equations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Range Equations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],∆ R = 5 m ∆ f IF  = 3.9 kHz
Doppler Processing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Sample Observations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
21 Second Dwell during Rain Clutter Downward Motion 5 m resolution 300 m 0 m
21 Second Dwell during Rain Clutter Downward Motion 300 m 0 m
21 & 10.5 Second Dwells Time: 0-10.5 sec Time: 10.5-21 sec Time: 0-21 sec
5 second Dwells Time: 0-5 sec Time: 10-15 sec Time: 5-10 sec Time: 15-20 sec
21 Second Dwell, Mean Reflectivity & Doppler Velocity
21 Second Dwell processed into 1 second intervals 21 Seconds
C- and X-band Observations During Snow C-Band Radar X-Band Radar A snow event passed over my house on 13 November 2009 and was observed by both the C-band and X-band  radars. The X-band transmitted power was limited due to a bad amplifier which reduced its altitude coverage.
Key Design Elements ,[object Object],[object Object],[object Object],[object Object]
Concluding Remarks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Williams_FR1_TO4_5_2011_07_29v1.ppt

  • 1.
  • 2.
  • 3.
  • 4.
  • 6. Antennas in my backyard (an understanding wife) C-band Antennas – 5.8 GHz X-band Antennas – 10.4 GHz Antennas are designed for point-to-point Internet service
  • 7. Hardware Layout Costs for C-band Radar ~$US 6k
  • 8. Simplified Tx and Rx Schematic
  • 9. Timing Diagram: Frequency Chirp and Data Collection Trigger f 0 f 1 B = f 1 - f 0 Frequency Chirp Data Collection Trigger T delay T dwell T end T wait T IPP T sweep Sweep Trigger Data is being collected
  • 10.
  • 11.
  • 12.
  • 13. Range Equations Target Tx Rx R f 0 f 1 B = f 1 - f 0 T sweep Tx Rx For a linear FM signal, a hard target located at range R will generate a delayed version of the transmitted signal t = 2 R / c seconds later.
  • 14.
  • 15.
  • 16.
  • 17.
  • 18.
  • 19. 21 Second Dwell during Rain Clutter Downward Motion 5 m resolution 300 m 0 m
  • 20. 21 Second Dwell during Rain Clutter Downward Motion 300 m 0 m
  • 21. 21 & 10.5 Second Dwells Time: 0-10.5 sec Time: 10.5-21 sec Time: 0-21 sec
  • 22. 5 second Dwells Time: 0-5 sec Time: 10-15 sec Time: 5-10 sec Time: 15-20 sec
  • 23. 21 Second Dwell, Mean Reflectivity & Doppler Velocity
  • 24. 21 Second Dwell processed into 1 second intervals 21 Seconds
  • 25. C- and X-band Observations During Snow C-Band Radar X-Band Radar A snow event passed over my house on 13 November 2009 and was observed by both the C-band and X-band radars. The X-band transmitted power was limited due to a bad amplifier which reduced its altitude coverage.
  • 26.
  • 27.