Data Quality Reports for Session: 132612 User: matthias1j Completed: 01/14/2011


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D100222.1GRW/WACR/M1 - Interference/False signalgrwwacrM1.b1, grwwacrspeccmaskxpolM1.a0, grwwacrspeccmaskcopolM1.a0
D100402.3GRW/WACR/M1 - Coherence Filter ContaminationgrwwacrM1.b1


DQRID : D100222.1
Start DateStart TimeEnd DateEnd Time
09/25/2009094510/03/20091200
Subject:
GRW/WACR/M1 - Interference/False signal
DataStreams:grwwacrM1.b1, grwwacrspeccmaskxpolM1.a0, grwwacrspeccmaskcopolM1.a0
Description:
Interference occurred between the WACR/SWACR beginning 9:45 GMT on 09/25.  This effect was 
not as noticeable on DQ plots until ~10 GMT on 09/27 at which time the interference was 
quite pronounced as vertical bands in the reflectivity and velocity plots.  The 
interference was slightly noticeable in the spectral width plots as well.  

Interference resulted from the SWACR using the same frequency as the WACR.  Interference 
was alleviated by changing the pulse repetition frequency (prf) from 10 kHz to 9.9 kHz.  
Some minor contamination still existed during the presence of highly reflective 
clouds/precipitation.

The Doppler velocity was not affected as much by the interference.  A cloud mask based on 
the Doppler velocity will remove most of this contamination in the reflectivity and 
spectra width measurements.
Measurements:grwwacrspeccmaskcopolM1.a0:
  • Cloud, reflectivity, at altitude(Reflectivity)
  • Cloud, doppler spectrum, at altitude, 8-mm radar(Spectra)
  • SignalToNoiseRatio
  • MMCR Spectral Width(SpectralWidth)

grwwacrM1.b1:
  • MMCR Spectral Width(SpectralWidth)
  • Cloud, reflectivity, at altitude(Reflectivity)
  • SignalToNoiseRatio

grwwacrspeccmaskxpolM1.a0:
  • Cloud, doppler spectrum, at altitude, 8-mm radar(Spectra)
  • Cloud, reflectivity, at altitude(Reflectivity)
  • SignalToNoiseRatio
  • MMCR Spectral Width(SpectralWidth)


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DQRID : D100402.3
Start DateStart TimeEnd DateEnd Time
06/09/2009160004/02/20101200
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.
Measurements:grwwacrM1.b1:
  • lat
  • PowerHotLoad
  • Temp_Computer_Enclosure
  • Temp_Antenna_Bottom
  • SignalToNoiseRatio
  • heights
  • PowerAmbientLoad
  • Temp_LNA
  • Temp_Modulator_Control
  • Polarization
  • PowerTransmitDriver
  • Temp_Hot
  • txpower
  • Temp_ambient
  • MMCR Spectral Width(SpectralWidth)
  • Noise
  • Temp_Outside
  • Temp_Future
  • base_time
  • alt
  • time
  • time_offset
  • wacr_status
  • Temp_Chiller
  • lon
  • Cloud, reflectivity, at altitude(Reflectivity)
  • Temp_Antenna_Top
  • Temp_Chiller_Supply
  • Temp_modulator
  • Temp_EIKA
  • MMCR Mean Doppler Velocity(MeanDopplerVelocity)
  • Temp_Chiller_Return


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