Data Quality Reports for Session: 116451 User: sherman Completed: 12/15/2008

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D080324.1SGP/MMCR/C1 - Sensitivity ShiftsgpmmcrmomC1.b1
D080421.2SGP/MMCR/C1 - Polarization Mode ProblemsgpmmcrmomC1.b1, sgpmmcrspecmomC1.a0


DQRID : D080324.1
Start DateStart TimeEnd DateEnd Time
02/21/2008193002/26/20081500
Subject:
SGP/MMCR/C1 - Sensitivity Shift
DataStreams:sgpmmcrmomC1.b1
Description:
There was a sensitivity shift on the MMCR during this period of time.  Cycling the power 
cleared the problem. Do not use data.
Measurements:sgpmmcrmomC1.b1:
  • Peak tranmitted power, averaged over the course of the hour(PeakTransmittedPowerAvg)
  • Receiver Gain(RxGain)
  • Range Corrected Calibrated Power(RangeCorrectedPower)
  • Receiver 290K Level(Rx290KLevel)
  • Number of Gate Heights(NumHeights)
  • Receiver Cal Check Level(CalCheckLevel)
  • Average Noise Level (S/N<0)(AvgNoiseLevel)
  • Delay to First Range Gate(StartGateDelay)
  • Number of Points in FFT(NumFFT)
  • Receiver Cal Check Time Stamp(CalCheckTime)
  • Mean Noise Level(NoiseLevel)
  • MMCR Mean Doppler Velocity(MeanDopplerVelocity)
  • Inter-Pulse Period(InterPulsePeriod)
  • DC Filtering ON-OFF Status(DCFilterONOFF)
  • radar mode char identifier(ModeDescription)
  • Receiver Cal Time Stamp(RxCalTimeStamp)
  • base time(base_time)
  • Windowing ON-OFF Status(WindowingONOFF)
  • MMCR Spectral Width(SpectralWidth)
  • Pulse Width(PulseWidth)
  • Number of Code Bits(NumCodeBits)
  • Power (uncalibrated)(Power)
  • RadarWaveLength(m) / [4 * InterPulsePeriod(s) * NumCoherentIntegrations](NyquistVelocity)
  • Receiver Sky Noise(SkyNoiseLevel)
  • Number of Receiver(NumReceivers)
  • lat(lat)
  • Minimum detectable reflectivity(MinimumDetectableReflectivity)
  • Gate Spacing(GateSpacing)
  • Operating Set for this Record(ModeNum)
  • Circular Depolarization Ratio(CircularDepolarizationRatio)
  • Receiver Mode(ReceiverMode)
  • Signal to Noise Ratio(SignalToNoiseRatio)
  • MMCR Reflectivity(Reflectivity)
  • Data Quality Status(DataQualityStatus)
  • Time offset of tweaks from base_time(time_offset)
  • Array of heights for each power(heights)
  • Number of Spectral Averages(NumSpectralAverages)
  • TWT Status Code, details forthcoming from MMCR vendor(TWTStatusCode)
  • Max. height of clutter removal(ClutterHeight)
  • Current Receiver Number(ReceiverNumber)
  • Number of Coherent Integrations(NumCoherentIntegrations)
  • time(time)
  • Time associated with hourly averaged values(TimeAvg)
  • lon(lon)
  • Dummy altitude for Zeb(alt)
  • Radar Constant(RadarConstant)

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DQRID : D080421.2
Start DateStart TimeEnd DateEnd Time
04/17/2008140004/23/20081445
Subject:
SGP/MMCR/C1 - Polarization Mode Problem
DataStreams:sgpmmcrmomC1.b1, sgpmmcrspecmomC1.a0
Description:
The cross-polarization and co-polarization modes (6 and 5) were measuring 
cross-polarization only.  This means that one of the control signals was not hooked up correctly.  The 
signals were rerouted on 4/23/2008.

The General Mode (mode 3) is a co-polarization channel and worked during this time period. 
 The reason why we don't use the general mode all of the time is that the co-pol and 
cross-pol modes are temporally closer and make a better estimation of linear depolarization 
ratio.
Measurements:sgpmmcrmomC1.b1:
  • MMCR Mean Doppler Velocity(MeanDopplerVelocity)
  • Signal to Noise Ratio(SignalToNoiseRatio)
  • MMCR Reflectivity(Reflectivity)
  • MMCR Spectral Width(SpectralWidth)
sgpmmcrspecmomC1.a0:
  • MMCR Mean Doppler Velocity(MeanDopplerVelocity)
  • MMCR Spectral Width(SpectralWidth)
  • MMCR Reflectivity(Reflectivity)

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