Solar contamination effects on the radiometric calibration of the advanced very high resolution radiometer

Changyong Cao; Michael P. Weinreb

doi:10.1117/12.494213

15 November 2000 Solar contamination effects on the radiometric calibration of the advanced very high resolution radiometer

Changyong Cao, Michael P. Weinreb

Author Affiliations +

Proceedings Volume 4135, Earth Observing Systems V; (2000) https://doi.org/10.1117/12.494213
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

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.

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Changyong Cao and Michael P. Weinreb "Solar contamination effects on the radiometric calibration of the advanced very high resolution radiometer", Proc. SPIE 4135, Earth Observing Systems V, (15 November 2000); https://doi.org/10.1117/12.494213

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