Data Quality Reports for Session: 132289 User: maclion Completed: 01/11/2011


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D060803.1NSA/MMCR/C1 - Sensitivity Loss, Calibration WrongnsammcrmomC1.00, nsammcrmomC1.b1, nsammcrspecmomC1.a0
D061211.1NSA/MMCR/C1 - MMCR TWTA FailurensammcrmomC1.00, nsammcrmomC1.b1, nsammcrspecmomC1.a0
D070716.4NSA/MMCR/C1 - Antenna Feed CorrosionnsammcrmomC1.b1, nsammcrspecmomC1.a0


DQRID : D060803.1
Start DateStart TimeEnd DateEnd Time
08/01/2005000002/01/20072359
Subject:
NSA/MMCR/C1 - Sensitivity Loss, Calibration Wrong
DataStreams:nsammcrmomC1.00, nsammcrmomC1.b1, nsammcrspecmomC1.a0
Description:
Jay Mace compared data from CLOUDSAT to the MMCR and found significant discrepancies.  It 
appears that the MMCR has a sensitivity problem and is underreporting reflectivity by ~20 
dBZ.  A comparison with the MPL shows that this might be a gradual degradation, i.e. 
there are no apparent shifts identifying when this might have occured.
Measurements:nsammcrmomC1.b1:
  • TimeAvg
  • DataQualityStatus
  • StartGateDelay
  • NumSpectralAverages
  • SkyNoiseLevel
  • RangeCorrectedPower
  • base_time
  • time_offset
  • RadarConstant
  • InterPulsePeriod
  • lat
  • alt
  • MMCR Mean Doppler Velocity(MeanDopplerVelocity)
  • NumCodeBits
  • PeakTransmittedPowerAvg
  • NyquistVelocity
  • ReceiverNumber
  • MMCR Spectral Width(SpectralWidth)
  • Cloud, reflectivity, at altitude(Reflectivity)
  • NumHeights
  • heights
  • TWTStatusCode
  • Power
  • NumFFT
  • ReceiverMode
  • AvgNoiseLevel
  • RxGain
  • NoiseLevel
  • SignalToNoiseRatio
  • Rx290KLevel
  • ClutterHeight
  • DCFilterONOFF
  • CalCheckTime
  • WindowingONOFF
  • lon
  • ModeDescription
  • time
  • RxCalTimeStamp
  • CalCheckLevel
  • NumReceivers
  • CircularDepolarizationRatio
  • NumCoherentIntegrations
  • ModeNum
  • PulseWidth
  • MinimumDetectableReflectivity
  • GateSpacing

nsammcrspecmomC1.a0:
  • NumSpectralAverages
  • MMCR Mean Doppler Velocity(MeanDopplerVelocity)
  • StartGateDelay
  • Elevation
  • CircularDepolarizationRatio
  • InterPulsePeriod
  • NumFFT
  • NumCodeBits
  • MinimumDetectableReflectivity
  • time_offset
  • Power
  • Heights
  • NumReceivers
  • NoiseLevel
  • ModeDescription
  • SkyNoiseLevel
  • ModeNum
  • lon
  • RxCalTimeStamp
  • Rx290KLevel
  • CalCheckLevel
  • DataQualityStatus
  • alt
  • base_time
  • CalibrationConstant
  • RadarConstant
  • SignalToNoiseRatio
  • ReceiverNumber
  • CalCheckTime
  • NumHeights
  • ReceiverMode
  • NyquistVelocity
  • AvgNoiseLevel
  • MMCR Spectral Width(SpectralWidth)
  • Azimuth
  • WindowingONOFF
  • ClutterHeight
  • PulseWidth
  • Cloud, doppler spectrum, at altitude, 8-mm radar(Spectra)
  • NumCoherentIntegrations
  • RxGain
  • RangeCorrectedPower
  • Cloud, reflectivity, at altitude(Reflectivity)
  • DCFilterONOFF
  • GateSpacing
  • lat

nsammcrmomC1.00:
  • AVHRR satellite images for Darwin from BOM (RAW)(raw)


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DQRID : D061211.1
Start DateStart TimeEnd DateEnd Time
11/05/2005010002/01/20072359
Subject:
NSA/MMCR/C1 - MMCR TWTA Failure
DataStreams:nsammcrmomC1.00, nsammcrmomC1.b1, nsammcrspecmomC1.a0
Description:
The TWTA is no longer transmitting.
Measurements:nsammcrmomC1.b1:
  • TimeAvg
  • DataQualityStatus
  • StartGateDelay
  • NumSpectralAverages
  • SkyNoiseLevel
  • RangeCorrectedPower
  • base_time
  • time_offset
  • RadarConstant
  • InterPulsePeriod
  • lat
  • alt
  • MMCR Mean Doppler Velocity(MeanDopplerVelocity)
  • NumCodeBits
  • PeakTransmittedPowerAvg
  • NyquistVelocity
  • ReceiverNumber
  • MMCR Spectral Width(SpectralWidth)
  • Cloud, reflectivity, at altitude(Reflectivity)
  • NumHeights
  • heights
  • TWTStatusCode
  • Power
  • NumFFT
  • ReceiverMode
  • AvgNoiseLevel
  • RxGain
  • NoiseLevel
  • SignalToNoiseRatio
  • Rx290KLevel
  • ClutterHeight
  • DCFilterONOFF
  • CalCheckTime
  • WindowingONOFF
  • lon
  • ModeDescription
  • time
  • RxCalTimeStamp
  • CalCheckLevel
  • NumReceivers
  • CircularDepolarizationRatio
  • NumCoherentIntegrations
  • ModeNum
  • PulseWidth
  • MinimumDetectableReflectivity
  • GateSpacing

nsammcrspecmomC1.a0:
  • NumSpectralAverages
  • MMCR Mean Doppler Velocity(MeanDopplerVelocity)
  • StartGateDelay
  • Elevation
  • CircularDepolarizationRatio
  • InterPulsePeriod
  • NumFFT
  • NumCodeBits
  • MinimumDetectableReflectivity
  • time_offset
  • Power
  • Heights
  • NumReceivers
  • NoiseLevel
  • ModeDescription
  • SkyNoiseLevel
  • ModeNum
  • lon
  • RxCalTimeStamp
  • Rx290KLevel
  • CalCheckLevel
  • DataQualityStatus
  • alt
  • base_time
  • CalibrationConstant
  • RadarConstant
  • SignalToNoiseRatio
  • ReceiverNumber
  • CalCheckTime
  • NumHeights
  • ReceiverMode
  • NyquistVelocity
  • AvgNoiseLevel
  • MMCR Spectral Width(SpectralWidth)
  • Azimuth
  • WindowingONOFF
  • ClutterHeight
  • PulseWidth
  • Cloud, doppler spectrum, at altitude, 8-mm radar(Spectra)
  • NumCoherentIntegrations
  • RxGain
  • RangeCorrectedPower
  • Cloud, reflectivity, at altitude(Reflectivity)
  • DCFilterONOFF
  • GateSpacing
  • lat

nsammcrmomC1.00:
  • AVHRR satellite images for Darwin from BOM (RAW)(raw)


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DQRID : D070716.4
Start DateStart TimeEnd DateEnd Time
01/01/2006000010/17/20070200
Subject:
NSA/MMCR/C1 - Antenna Feed Corrosion
DataStreams:nsammcrmomC1.b1, nsammcrspecmomC1.a0
Description:
During a trip to Barrow, I inspected the feed under the antenna and noticed an extreme 
amount of corrosion that has resulted in the flexible waveguide connected to the feed to be 
pushed off at an angle with corrosion in between.  I attempted to remove and clean but 
the corrosion has effectively welded the two pieces together.

This didn't happen overnight and the start date is a guess.  The last inspection of the 
antenna probably took place in April 2004 when we did the C40 DSP upgrade.  I don't know 
how much the reflectivity is affected by this corrosion.  It may be possible to get an idea 
once we replace the antenna by making some intercomparison measurements.

The feed was temporarily repaired on 10/16/2007 until the new antenna was installed.  The 
measured loss before and after the repair was 5.1 dB.  This means that the MMCR was 
under-reporting reflectivity by 10.2 dB just before it was repaired.  That said, there is no 
way of ascertaining what the rate of corrosion was and how the loss changed during the 
period of this DQR.  One can assume that the 5.1 dB loss was the worst that it was.
Measurements:nsammcrmomC1.b1:
  • Power
  • RadarConstant
  • Cloud, reflectivity, at altitude(Reflectivity)
  • RangeCorrectedPower

nsammcrspecmomC1.a0:
  • RangeCorrectedPower
  • Cloud, reflectivity, at altitude(Reflectivity)
  • RadarConstant
  • SignalToNoiseRatio
  • Power


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