DQRID : D080218.2
Start DateStart TimeEnd DateEnd Time
12/01/2007010002/14/20080200
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Subject:
NSA/MMCR/C1/C2 - Wrong Polarization
DataStreams:nsammcrmomC1.00, nsammcrspecmomC1.a0, nsammcrmomC1.b1
Description:
The new antenna was mistakingly set to transmit/receive in circular polarization instead 
of linear polarization.  The result is that reflectivities are much lower than they should 
be.  Since we only measure on polarization channel, there is no way to apply a 
correction to go from circular to linear polarization.
Suggestions: 
Do not use the data.
Measurements:nsammcrmomC1.b1:
  • Data Quality Status(DataQualityStatus)
  • Minimum detectable reflectivity(MinimumDetectableReflectivity)
  • Average Noise Level (S/N<0)(AvgNoiseLevel)
  • Number of Points in FFT(NumFFT)
  • TWT Status Code, details forthcoming from MMCR vendor(TWTStatusCode)
  • Number of Range Gates(NumHeights)
  • Circular Depolarization Ratio(CircularDepolarizationRatio)
  • Operating Set for this Record(ModeNum)
  • Pulse Width(PulseWidth)
  • Receiver Cal Check Level(CalCheckLevel)
  • Windowing ON-OFF Status(WindowingONOFF)
  • Radar Constant(RadarConstant)
  • Receiver Mode(ReceiverMode)
  • -180.0 - +180.0(alt)
  • base time in epoch(base_time)
  • North Latitude(lat)
  • Reflectivity(Reflectivity)
  • radar mode char identifier(ModeDescription)
  • Inter-Pulse Period(InterPulsePeriod)
  • lon(lon)
  • Current Receiver Number(ReceiverNumber)
  • DC Filtering ON-OFF Status(DCFilterONOFF)
  • Receiver Gain(RxGain)
  • Range Corrected Calibrated Power(RangeCorrectedPower)
  • Gate Spacing(GateSpacing)
  • Delay to First Range Gate(StartGateDelay)
  • Number of Spectral Averages(NumSpectralAverages)
  • Peak tranmitted power, averaged over the course of the hour(PeakTransmittedPowerAvg)
  • Receiver 290K Level(Rx290KLevel)
  • MMCR Spectral Width(SpectralWidth)
  • Number of Coherent Integrations(NumCoherentIntegrations)
  • Mean Noise Level(NoiseLevel)
  • Time associated with hourly averaged values(TimeAvg)
  • Power (uncalibrated)(Power)
  • Time offset from base_time(time_offset)
  • Max. height of clutter removal(ClutterHeight)
  • Receiver Sky Noise(SkyNoiseLevel)
  • Number of Receiver(NumReceivers)
  • RadarWaveLength(m) / [4 * InterPulsePeriod(s) * NumCoherentIntegrations](NyquistVelocity)
  • Range Heights (center of radar sample volume)(heights)
  • time_in_seconds_since_volume_start(time)
  • Signal to Noise Ratio(SignalToNoiseRatio)
  • MMCR Mean Doppler Velocity(MeanDopplerVelocity)
  • Receiver Cal Time Stamp(RxCalTimeStamp)
  • Receiver Cal Check Time Stamp(CalCheckTime)
  • Number of Code Bits(NumCodeBits)
more
nsammcrspecmomC1.a0:
  • Data Quality Status(DataQualityStatus)
  • Max. height of clutter removal(ClutterHeight)
  • Receiver 290K Level(Rx290KLevel)
  • Delay to First Range Gate(StartGateDelay)
  • Radar Constant(RadarConstant)
  • Receiver Cal Check Level(CalCheckLevel)
  • Number of Spectral Averages(NumSpectralAverages)
  • Range Corrected Calibrated Power(RangeCorrectedPower)
  • Signal to Noise Ratio(SignalToNoiseRatio)
  • Average Noise Level (S/N<0)(AvgNoiseLevel)
  • Number of Code Bits(NumCodeBits)
  • Power (uncalibrated)(Power)
  • Elevation(Elevation)
  • radar mode char identifier(ModeDescription)
  • Mean Noise Level(NoiseLevel)
  • Circular Depolarization Ratio(CircularDepolarizationRatio)
  • base time in epoch(base_time)
  • Windowing ON-OFF Status(WindowingONOFF)
  • Operating Set for this Record(ModeNum)
  • Inter-Pulse Period(InterPulsePeriod)
  • First Order Estimate of Spectral Count Calibration(CalibrationConstant)
  • Receiver Cal Time Stamp(RxCalTimeStamp)
  • Gate Spacing(GateSpacing)
  • Reflectivity(Reflectivity)
  • Number of Coherent Integrations(NumCoherentIntegrations)
  • Number of Points in FFT(NumFFT)
  • Receiver Gain(RxGain)
  • Minimum detectable reflectivity(MinimumDetectableReflectivity)
  • Range Heights (center of radar sample volume)(Heights)
  • Time offset from base_time(time_offset)
  • RadarWaveLength(m) / [4 * InterPulsePeriod(s) * NumCoherentIntegrations](NyquistVelocity)
  • Number of Range Gates(NumHeights)
  • MMCR Spectral Width(SpectralWidth)
  • Pulse Width(PulseWidth)
  • lon(lon)
  • DC Filtering ON-OFF Status(DCFilterONOFF)
  • Receiver Sky Noise(SkyNoiseLevel)
  • Receiver Mode(ReceiverMode)
  • MMCR Mean Doppler Velocity(MeanDopplerVelocity)
  • North Latitude(lat)
  • -180.0 - +180.0(alt)
  • Receiver Cal Check Time Stamp(CalCheckTime)
  • Number of Receiver(NumReceivers)
  • Current Receiver Number(ReceiverNumber)
  • Azimuth(Azimuth)
  • Spectra(Spectra)
more
nsammcrmomC1.00:
  • (Raw data stream - documentation not supported)
more

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