Data Quality Reports for Session: 185302 User: sbenson Completed: 05/01/2017


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected Data Quality Metric
D100402.3GRW/WACR/M1 - Coherence Filter ContaminationgrwwacrM1.b1Suspect
D100729.5GRW/WACR/M1 - Reprocessed: Reflectivity and Height OffsetsgrwwacrM1.b1Does not affect quality
D101007.2GRW/WACR/M1 - Missing datagrwwacrM1.b1Missing
D120301.1GRW/WACR/M1 - Transmit power drop outsgrwwacrM1.b1Incorrect


DQRID : D100402.3
Start DateStart TimeEnd DateEnd Time Data Quality Metric
06/09/2009160004/02/20101200Suspect
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:
  • North latitude(lat)
  • PowerHotLoad
  • Temp_Computer_Enclosure
  • Temp_Antenna_Bottom
  • SignalToNoiseRatio
  • heights
  • PowerAmbientLoad
  • Temp_LNA
  • Temp_Modulator_Control
  • Polarization
  • PowerTransmitDriver
  • Temp_Hot
  • MMCR Spectral Width(SpectralWidth)
  • txpower
  • Temp_ambient
  • Noise
  • Temp_Outside
  • Temp_Future
  • base_time
  • Altitude above mean sea level(alt)
  • time
  • time_offset
  • wacr_status
  • Temp_Chiller
  • East longitude(lon)
  • Reflectivity(Reflectivity)
  • Temp_Antenna_Top
  • Temp_Chiller_Supply
  • Temp_modulator
  • Temp_EIKA
  • MMCR Mean Doppler Velocity(MeanDopplerVelocity)
  • Temp_Chiller_Return


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DQRID : D100729.5
Start DateStart TimeEnd DateEnd Time Data Quality Metric
05/14/2009000001/06/20110800Does not affect quality
Subject:
GRW/WACR/M1 - Reprocessed: Reflectivity and Height Offsets
DataStreams:grwwacrM1.b1
Description:
The instrument vendor informed us of a range (height) offset of 13 m and provided updated 
reflectivity calibration.  All values reported for 'Reflectivity' were approximately 3 dB 
too low.   In addition, the Reflectivity in the first and fourth range gates (starting 
from the surface) needed to be further corrected by an additional 2.7 and -0.9 dB, 
respectively. The 'height' field values were 13.33 m too low.  The data were reprocessed to 
correct these problems.

The grwwacrM1.b1 data were reprocessed and archived in October 2010.  The 
grwwacrspeccmaskcopolM1.a0 and grwwacrspeccmaskxpolM1.a0 data were reprocessed and archived in January 
2012.
Measurements:grwwacrM1.b1:
  • Reflectivity(Reflectivity)
  • heights


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DQRID : D101007.2
Start DateStart TimeEnd DateEnd Time Data Quality Metric
09/01/2010210009/24/20101930Missing
Subject:
GRW/WACR/M1 - Missing data
DataStreams:grwwacrM1.b1
Description:
Data are missing and unrecoverable.
Measurements:grwwacrM1.b1:
  • North latitude(lat)
  • PowerHotLoad
  • Temp_Computer_Enclosure
  • Temp_Antenna_Bottom
  • SignalToNoiseRatio
  • heights
  • PowerAmbientLoad
  • Temp_LNA
  • Temp_Modulator_Control
  • Polarization
  • PowerTransmitDriver
  • Temp_Hot
  • MMCR Spectral Width(SpectralWidth)
  • txpower
  • Temp_ambient
  • Noise
  • Temp_Outside
  • Temp_Future
  • base_time
  • Altitude above mean sea level(alt)
  • time
  • time_offset
  • wacr_status
  • Temp_Chiller
  • East longitude(lon)
  • Reflectivity(Reflectivity)
  • Temp_Antenna_Top
  • Temp_Chiller_Supply
  • Temp_modulator
  • Temp_EIKA
  • MMCR Mean Doppler Velocity(MeanDopplerVelocity)
  • Temp_Chiller_Return


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DQRID : D120301.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
07/27/2009162710/19/20101237Incorrect
Subject:
GRW/WACR/M1 - Transmit power drop outs
DataStreams:grwwacrM1.b1
Description:
At approximately 16:27 GMT on 20090727, txpower began intermittently dropping out and 
reporting slightly negative values.  This issue continued intermittently through 20090807 
when it stopped occurring.  The problem resumed 20091006 and continued to occur on a daily 
basis until the monitor detector was replaced 20101019.

The transmit power as measured by the detector after replacement was approximately 1.3 dB 
less than when it failed.  Reflectivity measurements have a +0/-1.3 dBZ of additional 
uncertainty for this period of time.
Measurements:grwwacrM1.b1:
  • txpower
  • Reflectivity(Reflectivity)


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