DQRID : D020117.22
Start DateStart TimeEnd DateEnd Time
07/20/2001164209/26/20011458
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Subject:
SGP/MWR/E14 - Incorrect azimuth value reported
DataStreams:sgpmwrtipE14.a1
Description:
On 7/18/01, the hard disk of the MWR laptop failed. The hard disk was replaced
and reconfigured with the Core PC Configuration on 7/20. Unfortunately, the MWR
configuration file that I supplied had a tip azimuth angle set incorrectly to 0
degrees instead of 270.

Site Operations compensated for the configuration file error by physically
reorienting the azimuth drive so that a "0 degree" command actually oriented
the MWR to 270 degrees which is the desired azimuth for tip mode. Therefore,
the tip data, except the reported azimuth values, were not affected because
the instrument was scanning properly at 270 degrees.

The LOS azimuth angle in the configurations file was set correctly to 270
degrees but because of the physical reorientation of the instrument it
should have been reported as 180.

This condition ended on 9/26/01 by physically correcting the orientation of
the azimuth drive to 0 degrees and by correcting the tip azimuth angle in the
configuration file to 270 degrees.

During this period, field actaz in sgpmwrtipE14 should be 270 instead of 0
and the global attribute azimuth in sgpmwrlosE14 header should be 180 instead
of 270.
Suggestions: 
Scientific data are not affected; correct for error in reported azimuth if
necessary for your analysis.
Measurements:sgpmwrtipE14.a1:
  • Actual Azimuth(actaz)
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