DQRs for Session: 144658 User:hannes1dieCompleted: 09-06-2012

Data Quality Reports for Session: 144658 User: hannes1die Completed: 09/06/2012

TABLE OF CONTENTS

DQR ID	Subject	Data Streams Affected
D050714.4	SGP/MMCR/C1 - Poor cross polar isolation	sgpmmcrmomC1.b1
D061229.1	SGP/MMCR/C1 - TWTA Faulting	sgpmmcrmomC1.b1, sgpmmcrspecmomC1.a0, sgpmmcrmomC1.00
D080324.1	SGP/MMCR/C1 - Sensitivity Shift	sgpmmcrmomC1.b1
D080421.2	SGP/MMCR/C1 - Polarization Mode Problem	sgpmmcrmomC1.b1, sgpmmcrspecmomC1.a0

DQRID : D050714.4

Start Date	Start Time	End Date	End Time
08/15/2004	0000	08/27/2010	2100

Subject:	SGP/MMCR/C1 - Poor cross polar isolation
DataStreams:	sgpmmcrmomC1.b1
Description:	This last spring, Sergey Matrosov pointed out that the Circular Depolarization Ratio measurements on the SGP radar indicated the isolation between the co and cross channels was only about 15 dB. Typically isolation of 25-30 dB is expected for polarization measurements to be useful. We set about to see if we could identify the source of the poor isolation. Kevin Widener had purchased a custom built orthomode transducer and polarizer that hadn't gone through any previous testing and we decided to swap it out with an ETL unit that had shown good isolation in the past. Kevin performed the swap a couple of weeks back and this week the latest archive data was available to compare results between the OMTs. Results from two precipitating cloud conditions, where we looked below the melting layer, where we expect to find domination of spherical water droplets and therefore maximum values for cdr - the maximum isolation (CDR) appears to be about 17 dB. The results showed that the poor isolation is probably not due to the OMTs but rather to the antenna itself.
Measurements:	sgpmmcrmomC1.b1: CircularDepolarizationRatio

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DQRID : D061229.1

Start Date	Start Time	End Date	End Time
01/13/2007	1900	01/13/2007	2359
01/14/2007	0330	01/14/2007	1400
01/15/2007	0300	01/15/2007	1500
11/23/2006	1900	11/23/2006	2359
12/03/2006	0900	12/03/2006	2359
12/04/2006	1900	12/04/2006	2359
12/06/2006	0200	12/06/2006	2359
12/07/2006	1300	12/07/2006	1600
12/11/2006	0700	12/11/2006	2359
12/17/2006	0200	12/17/2006	2359
12/18/2006	0400	12/18/2006	2359
12/24/2006	0600	12/24/2006	2359
12/26/2006	0900	12/26/2006	1300
12/27/2006	1400	12/27/2006	1500
01/07/2007	1700	01/07/2007	1900
01/10/2007	1000	01/10/2007	1400
01/12/2007	1100	01/12/2007	1300
01/13/2007	0800	01/13/2007	1530

Subject:	SGP/MMCR/C1 - TWTA Faulting
DataStreams:	sgpmmcrmomC1.b1, sgpmmcrspecmomC1.a0, sgpmmcrmomC1.00
Description:	The MMCR transmitter (TWTA) has been having a low helix current fault. This results in the transmitter shutting down. However, the radar continues to collect data. The MMCR restarts the TWTA at 0000 each day, hence the 2359 end times for many of these intervals.
Measurements:	sgpmmcrmomC1.00: AVHRR satellite images for Darwin from BOM (RAW)(raw) sgpmmcrmomC1.b1: lat SignalToNoiseRatio RadarConstant RxCalTimeStamp GateSpacing TimeAvg NumHeights PeakTransmittedPowerAvg DataQualityStatus ModeNum ModeDescription SkyNoiseLevel CalCheckTime time_offset heights Power RangeCorrectedPower NoiseLevel AvgNoiseLevel CalCheckLevel alt Cloud, reflectivity, at altitude(Reflectivity) NumReceivers MinimumDetectableReflectivity NumCodeBits NumCoherentIntegrations TWTStatusCode MMCR Spectral Width(SpectralWidth) lon CircularDepolarizationRatio time ReceiverNumber NumFFT NumSpectralAverages ClutterHeight base_time PulseWidth RxGain InterPulsePeriod DCFilterONOFF ReceiverMode StartGateDelay Rx290KLevel NyquistVelocity MMCR Mean Doppler Velocity(MeanDopplerVelocity) WindowingONOFF sgpmmcrspecmomC1.a0: ReceiverNumber NyquistVelocity NumCodeBits CalCheckTime time_offset ModeNum InterPulsePeriod MinimumDetectableReflectivity RangeCorrectedPower Elevation NumReceivers PulseWidth ReceiverMode GateSpacing lat WindowingONOFF DataQualityStatus RxCalTimeStamp RadarConstant StartGateDelay CalibrationConstant NoiseLevel Rx290KLevel ModeDescription Azimuth NumCoherentIntegrations Heights Power ClutterHeight SkyNoiseLevel MMCR Mean Doppler Velocity(MeanDopplerVelocity) DCFilterONOFF NumFFT alt CircularDepolarizationRatio MMCR Spectral Width(SpectralWidth) SignalToNoiseRatio CalCheckLevel AvgNoiseLevel RxGain NumSpectralAverages lon base_time Cloud, doppler spectrum, at altitude, 8-mm radar(Spectra) Cloud, reflectivity, at altitude(Reflectivity) NumHeights

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DQRID : D080324.1

Start Date	Start Time	End Date	End Time
02/21/2008	1930	02/26/2008	1500

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: lat Cloud, reflectivity, at altitude(Reflectivity) MinimumDetectableReflectivity NumReceivers SignalToNoiseRatio NumCodeBits RadarConstant TimeAvg RxCalTimeStamp GateSpacing NumHeights PeakTransmittedPowerAvg DataQualityStatus NumCoherentIntegrations ModeNum ModeDescription SkyNoiseLevel TWTStatusCode MMCR Spectral Width(SpectralWidth) lon CircularDepolarizationRatio time ReceiverNumber NumFFT base_time ClutterHeight CalCheckTime NumSpectralAverages time_offset heights RxGain PulseWidth InterPulsePeriod DCFilterONOFF Power StartGateDelay ReceiverMode Rx290KLevel RangeCorrectedPower NoiseLevel NyquistVelocity AvgNoiseLevel CalCheckLevel WindowingONOFF MMCR Mean Doppler Velocity(MeanDopplerVelocity) alt

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DQRID : D080421.2

Start Date	Start Time	End Date	End Time
04/17/2008	1400	04/23/2008	1445

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: Cloud, reflectivity, at altitude(Reflectivity) SignalToNoiseRatio MMCR Spectral Width(SpectralWidth) MMCR Mean Doppler Velocity(MeanDopplerVelocity) sgpmmcrspecmomC1.a0: MMCR Mean Doppler Velocity(MeanDopplerVelocity) Cloud, reflectivity, at altitude(Reflectivity) MMCR Spectral Width(SpectralWidth)

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