DQRID : D100402.3
Start DateStart TimeEnd DateEnd Time Data Quality Metric
06/09/2009160004/02/20101200Suspect
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Subject:
GRW/WACR/M1 - Coherence Filter Contamination
DataStreams:grwwacrM1.b1
Description:
The coherence filter (software) that was added to the WACR under BCR-01500 was causing 
occasional contamination to WACR data.  This was exhibited in the first 2000 m of range by 
streaking in the data over a period of time. It didn't occur often and when it did, it is 
quite obvious looking at the plots.  

On 4/2/2010 at 12:00 UTC, the coherence filter was modified to preclude working on signals 
with a SNR greater than 60 dB.  The vendor thinks this will solve the problem.
Suggestions: 
Spectra data can probably be "easily" filtered to remove this artifact. Regenerating 

the Doppler moments from the filtered spectra will need to be done.
Measurements:grwwacrM1.b1:
  • Polarization
  • MeanDopplerVelocity
  • PowerAmbientLoad
  • Noise
  • Temp_Chiller_Supply
  • lat
  • Temp_Hot
  • wacr_status
  • time
  • Temp_Future
  • lon
  • PowerTransmitDriver
  • Temp_Computer_Enclosure
  • SignalToNoiseRatio
  • Temp_LNA
  • Temp_Outside
  • txpower
  • base_time
  • Temp_Chiller
  • Temp_Modulator_Control
  • heights
  • SpectralWidth
  • alt
  • Temp_Chiller_Return
  • Reflectivity
  • Temp_ambient
  • Temp_EIKA
  • PowerHotLoad
  • Temp_Antenna_Bottom
  • time_offset
  • Temp_modulator
  • Temp_Antenna_Top
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