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Spectral identification & suppression of ground clutter contributions for phased array radar

9A.4. Spectral identification of ground clutter. Spectral identification & suppression of ground clutter contributions for phased array radar. Svetlana Bachmann, Dusan Zrnic, and Chris Curtis CIMMS, University of Oklahoma NSSL/OAR/NOAA, Norman, Oklahoma. Doppler Spectrum. Power, dB.

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Spectral identification & suppression of ground clutter contributions for phased array radar

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  1. 9A.4 Spectral identification of ground clutter Spectral identification & suppression of ground clutter contributions for phased array radar Svetlana Bachmann, Dusan Zrnic, and Chris Curtis CIMMS, University of Oklahoma NSSL/OAR/NOAA, Norman, Oklahoma

  2. Doppler Spectrum Power, dB –va–½va 0 ½vava Doppler velocity Ground clutter Weather Noise Each pixel on a radar display (one resolution volume) is obtained from many samples. For a large number of samples, a Doppler spectrum can be estimated. A Doppler spectrum is a distribution of echoes (from one resolution volume) in Doppler velocity.

  3. Doppler Spectrum Power, dB v –va–½va 0 ½vava Doppler velocity v Ground clutter Weather Noise

  4. Phase-based clutter identification Power, dB Power, dB –½va 0 ½va –½va 0 ½va Power, dB –va–½va 0 ½vava eo, radians Doppler velocity –½va 0 ½va Back in the Time Domain Sample Time

  5. Simulations eo, radians –½va 0 ½va 100 simulations: PRT = 0.8 ms, SNR = 20 dB, CSR = 40 dB, v = 2 m s–1, v = 10 m s–1 Pulse repetition time Signal to noise ratio Clutter to signal ratio Spectral width of weather • eois a • spectral density of • phase coherence • diff. phase between • spectral coefficient of • even- and odd-indexed • time series Phase eo is close to 0 at Doppler bins with ground clutter Power, dB Velocity, m s–1 eo, radians

  6. Simulations - zoom in Power, dB eo, radians Doppler velocity, m s–1 100 simulations: PRT = 0.8 ms, SNR = 40 dB, CSR = 40 dB, v = 2 m s–1 1.5 1.0 0.5 0 -0.5 -1.0 -1.5

  7. Simulations – with & without clutter PRT = 0.8 ms, SNR = 40 dB, v = 2 m s–1, v = -5:5 m s–1 CSR = -40 dB CSR = 0dB Original Notched Original Notched Simulation Velocity, m s–1 velocity, m s–1 velocity, m s–1 Velocity, m s–1 Power, dB

  8. Radar data Power,dB Range, km velocity, m s–1 velocity, m s–1 collected by Dave Priegnitz Sept. 25, 2007, 13:49:59 UTC

  9. Radar data Power,dB Range, km velocity, m s–1 velocity, m s–1 July 26, 2007, 13:32:29 UTC

  10. 9A.4 Phase-based Spectral identification& suppression of ground cluttercontributions for phased array radar Thank you!Questions?

  11. More examples Sept.19, 2007, 13:46:46 UTC Sept.25, 2007, 15:14:52 UTC July 30, 2007, 15:50:10 UTC Power, dB

  12. How does this technique compare to NEXRAD spectral GCF? OLD NEW

  13. How does this technique compare to NEXRAD spectral GCF? NEW OLD

  14. How does this technique compare to NEXRAD spectral GCF? NEW OLD

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