DQRs for Session: 133688 User:dhuangCompleted: 03-07-2011

Data Quality Reports for Session: 133688 User: dhuang Completed: 03/07/2011

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	sgpmmcrmomC1.00, 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
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
01/13/2007	1900	01/13/2007	2359
01/14/2007	0330	01/14/2007	1400
01/15/2007	0300	01/15/2007	1500

Subject:	SGP/MMCR/C1 - TWTA Faulting
DataStreams:	sgpmmcrmomC1.00, sgpmmcrmomC1.b1, sgpmmcrspecmomC1.a0
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 GateSpacing TimeAvg RxCalTimeStamp NumHeights PeakTransmittedPowerAvg DataQualityStatus ModeDescription ModeNum SkyNoiseLevel CalCheckTime time_offset heights Power RangeCorrectedPower NoiseLevel AvgNoiseLevel CalCheckLevel alt Cloud, reflectivity, at altitude(Reflectivity) MinimumDetectableReflectivity NumReceivers NumCodeBits NumCoherentIntegrations TWTStatusCode MMCR Spectral Width(SpectralWidth) lon CircularDepolarizationRatio time NumFFT ReceiverNumber NumSpectralAverages base_time ClutterHeight 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 NumReceivers Elevation PulseWidth ReceiverMode GateSpacing lat WindowingONOFF DataQualityStatus RxCalTimeStamp RadarConstant StartGateDelay CalibrationConstant Rx290KLevel NoiseLevel ModeDescription Azimuth NumCoherentIntegrations Heights Power ClutterHeight MMCR Mean Doppler Velocity(MeanDopplerVelocity) SkyNoiseLevel DCFilterONOFF NumFFT alt CircularDepolarizationRatio MMCR Spectral Width(SpectralWidth) SignalToNoiseRatio CalCheckLevel AvgNoiseLevel NumSpectralAverages RxGain lon base_time Cloud, reflectivity, at altitude(Reflectivity) Cloud, doppler spectrum, at altitude, 8-mm radar(Spectra) NumHeights

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