Williams_FR1_TO4_5_2011_07_29v1.ppt

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]

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]

Williams_FR1_TO4_5_2011_07_29v1.ppt

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Williams_FR1_TO4_5_2011_07_29v1.ppt