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449 MHz Modular Profiler

449 MHz Modular Profiler. Design Review 24 February 2011. William Brown. Design Review. Bill : Overview of performance at first deployment Sandra : Project Plan Progress Brad : Engineering LDMOS amplifier Circulators Antenna Charlie : discussion of data system progress.

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449 MHz Modular Profiler

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  1. 449 MHz Modular Profiler Design Review 24 February 2011 William Brown

  2. Design Review Bill : Overview of performance at first deployment Sandra : Project Plan Progress Brad : Engineering LDMOS amplifier Circulators Antenna Charlie : discussion of data system progress

  3. 449 Profiler : first deployment 915 MHz Wind Profiler 449 MHz Wind Profiler • PCAPS (Persistent Cold Pool Study) • Salt Lake, Utah, Dec 2010 - Feb 2011 • Two wind profiler radars : • 915 MHz wind profiler • 449 MHz wind profiler (3 modules)

  4. 449 SiteSVWRF SVWRF RAS 2 Pump Station South Valley Water Reclamation Facility 915MHz profiler + RASS 449MHz profiler Approx 1.2 km from sounding site 915 Wind Profiler with RASS Trailer/Container (2) Met. tower 50’ 449 Wind Profiler

  5. Photos

  6. 2 Jan 2011 449 MHz PCAPS Winds 915 MHz • Plot shows southerlies in trapped cold air pool, westerlies aloft • 449 Profiler sees on average ~1 km higher than 915 profiler • 449 sees the flow aloft and the mixing with cold pool not seen by 915

  7. Comparison with 915 • Winds recovery rates vs hgt • Consensus average pass rates • 449 MHz 150m pulse 4-bit code • 915 low 100m pulse 4-bit code • 915 high 250m pulse 2-bit code • At 75% rate • 449 1.2 km higher than 915 low • 449 0.5 km higher than 915 high • 449 lowest gate ~600m 449 915 High 915 Low

  8. Piraq vs Pentek PIRAQ PENTEK 449 915 High 915 Low

  9. Time Series SNR Comparison 449 915 SNR Max Wind Hgt Delta Sigma LDMOS

  10. SNR Comparison with 915 Winds consensus SNRs All data LDMOS & Delta Sig

  11. SNR comparison with 9152 Amps LDMOS Precipitation Consensus Winds SNRs Shows amps consistent Agreeing within ~ 3 dB Delta Sigma

  12. Winds RecoveryLDMOS & Delta Sigma Very similar winds rates

  13. Winds Comparison with 915 Good agreement Median Abs. Deviation Speed 1.8 m/s Direction 5 degrees

  14. 449 Time SeriesWinds Comparison 915 Delta Sigma LDMOS SNR Wind Speed Direction

  15. Winds LDMOS & Delta Sigma Similar winds agreement During Delta-Sigma test lots of precip

  16. Speed Comparison as function of SNR & Spectral Width Better agreement for stronger SNR Better agreement for narrower Doppler spectral width

  17. Comparison with radiosondes 915 Speed 915 Dirn Soundings 1.2 km south of profilers Similar agreement with sondes 449 Speed 449 Dirn

  18. Summary • 449 MHz profiler getting good altitude coverage • Winds agree well with both 915 MHz profiler and with radiosondes • Big improvement going from PIRAQ to Pentek • LDMOS amp performance similar to Delta Sigma amp • Algorithms could be improved to get better agreement

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