| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D100222.1 | GRW/WACR/M1 - Interference/False signal | grwwacrM1.b1, grwwacrspeccmaskxpolM1.a0, grwwacrspeccmaskcopolM1.a0 |
| D100402.3 | GRW/WACR/M1 - Coherence Filter Contamination | grwwacrM1.b1 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/25/2009 | 0945 | 10/03/2009 | 1200 |
| Subject: | GRW/WACR/M1 - Interference/False signal |
| DataStreams: | grwwacrM1.b1, grwwacrspeccmaskxpolM1.a0, grwwacrspeccmaskcopolM1.a0 |
| Description: | Interference occurred between the WACR/SWACR beginning 9:45 GMT on 09/25. This effect was not as noticeable on DQ plots until ~10 GMT on 09/27 at which time the interference was quite pronounced as vertical bands in the reflectivity and velocity plots. The interference was slightly noticeable in the spectral width plots as well. Interference resulted from the SWACR using the same frequency as the WACR. Interference was alleviated by changing the pulse repetition frequency (prf) from 10 kHz to 9.9 kHz. Some minor contamination still existed during the presence of highly reflective clouds/precipitation. The Doppler velocity was not affected as much by the interference. A cloud mask based on the Doppler velocity will remove most of this contamination in the reflectivity and spectra width measurements. |
| Measurements: | grwwacrspeccmaskcopolM1.a0:
grwwacrM1.b1:
grwwacrspeccmaskxpolM1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/09/2009 | 1600 | 04/02/2010 | 1200 |
| Subject: | GRW/WACR/M1 - Coherence Filter Contamination |
| DataStreams: | grwwacrM1.b1 |
| Description: | The coherence filter (software) that was added to the WACR under BCR-01500 was causing occasional contamination to WACR data. This was exhibited in the first 2000 m of range by streaking in the data over a period of time. It didn't occur often and when it did, it is quite obvious looking at the plots. On 4/2/2010 at 12:00 UTC, the coherence filter was modified to preclude working on signals with a SNR greater than 60 dB. The vendor thinks this will solve the problem. |
| Measurements: | grwwacrM1.b1:
|