DQRID : D170224.7
Start DateStart TimeEnd DateEnd Time Data Quality Metric
08/11/2004000001/04/20111500Does not affect quality
more
Subject:
SGP/MMCR/C1 - Precipitation Mode Reflectivity Incorrect
DataStreams:sgpmmcrspecmomC1.a0, sgpmmcrspeccmaskcopolC1.a0, sgpmmcrspeccmaskprC1.a0, sgpmmcrmomC1.b1,
sgpmmcrC1.00, sgpmmcrspeccmaskxpolC1.a0
Description:
The MMCR's precipitation mode is achieved by switching in one of two rf switches thereby 
intending to add approximately 25 dB of attenuation.  This prevents the receiver and 
computer ADC from saturating. It now appears that the amount of attenuation actually being 
applied varied, and is not accurately known.  The precipitation mode reflectivities values 
may not be quantitatively accurate.

Most of the time a bit more than the intended 25 dB of attenuation was actually being 
applied.  Mode 4 reflectivities are consistently less than Mode 3 reflectivities (by anywhere 
from a few to 10 dBZ).
Suggestions: 
The reflectivity values should not be used in a quantitative manner.
Measurements:sgpmmcrmomC1.b1:
  • MinimumDetectableReflectivity
  • Reflectivity
more
sgpmmcrspecmomC1.a0:
  • Reflectivity
  • MinimumDetectableReflectivity
more
sgpmmcrspeccmaskprC1.a0:
  • Documentation not available
more
sgpmmcrspeccmaskxpolC1.a0:
  • Documentation not available
more
sgpmmcrspeccmaskcopolC1.a0:
  • Documentation not available
more
sgpmmcrC1.00:
  • Raw data stream - documentation not supported
more

Close this window