Computer Science – Sound
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999adspr..23.1367w&link_type=abstract
Advances in Space Research, Volume 23, Issue 8, p. 1367-1375.
Computer Science
Sound
1
Scientific paper
The calibration of the imagers and sounders on GOES 8-10 is reviewed, with special attention to the specialized processing added to mitigate the effects of subtle instrument problems first discovered when the satellites were in orbit. These problems include an east-west scan-position variation of the reflectance of the scan mirrors of the instruments, caused by polarization by the scan mirrors' SiOx coatings; image striping of a few tenths of a Kelvin in the imager channels that use photo-conductive HgCdTe detectors, caused primarily by high 1/f noise in the detectors; and calibration errors in the shortwave channels of up to 1K near satellite midnight, caused by radiation from solar-heated components in the instruments' scan cavities. There is also a gradual long-term decrease in the responsivity of the imagers' visible channels. Despite the lack of an onboard calibration source for these channels, we have been able to use routine observations of stars to infer that the rate of decrease is approximately 8 and 5% per year for the GOES-8 and -9 imagers, respectively.
Baucom J. G.
Bremer James C.
Johnson Rongrong X.
Weinreb Michael P.
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