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Proceedings Paper

Solar contamination effects on the radiometric calibration of the advanced very high resolution radiometer
Author(s): Changyong Cao; Michael P. Weinreb
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Paper Abstract

A study of the solar contamination in the radiometric calibration for the NOAA -14, and –15 Advanced Very High Resolution Radiometers (AVHRR) is presented. The solar contamination results in a disagreement between the sensormeasured radiometric output of the onboard blackbody vs. its bulk temperature measured by the platinum resistance thermometers. The sunshield installed on the latest version of the instrument on NOAA-15 may have alleviated but not eliminated the problem. The anomaly can still contribute errors on the order of half a degree in the 3 .7 µm infrared channel. Analysis of the time scale and the spectral characteristics of the radiometric anomaly suggest that the extraneous radiation is a combination of solar radiation and background radiation by an object other than the blackbody. Stray light in earth scenes is also found where the anomaly in the radiometric calibration occurs. The radiometric intensity and spectral characteristics of the stray light are analyzed in order to trace the source of the extraneous radiation. It is found that the effects occur as the spacecraft moves out of the shadow of the earth at a low sun elevation. The intensity of the effect appears to be related to the solar zenith and azimuth angles at the spacecraft.

Paper Details

Date Published: 15 November 2000
PDF: 10 pages
Proc. SPIE 4135, Earth Observing Systems V, (15 November 2000); doi: 10.1117/12.494213
Show Author Affiliations
Changyong Cao, National Oceanic and Atmospheric Administration (United States)
Michael P. Weinreb, National Oceanic and Atmospheric Administration (United States)


Published in SPIE Proceedings Vol. 4135:
Earth Observing Systems V
William L. Barnes, Editor(s)

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