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Proceedings Paper

On-orbit performance of MODIS solar diffuser stability monitor
Author(s): Xiaoxiong (Jack) Xiong; Amit Angal; Taeyoung Choi; Junqiang Sun; Eric Johnson
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Paper Abstract

MODIS reflective solar bands (RSB) calibration is provided by an on-board solar diffuser (SD). On-orbit changes in the SD bi-directional reflectance factor (BRF) are tracked by a solar diffuser stability monitor (SDSM). The SDSM consists of a solar integration sphere (SIS) with nine detectors covering wavelengths from 0.41 to 0.94 μm. It functions as a ratioing radiometer, making alternate observations of the sunlight through a fixed attenuation screen and the sunlight diffusely reflected from the SD during each scheduled SD/SDSM calibration event. Since launch, Terra and Aqua MODIS SD/SDSM systems have been operated regularly to support the RSB on-orbit calibration. This paper provides an overview of MODIS SDSM design functions, its operation and calibration strategies, and on-orbit performance. Changes in SDSM detector responses over time and their potential impact on tracking SD on-orbit degradation are examined. Also presented in this paper are lessons learned from MODIS SD/SDSM calibration system and improvements made to the VIIRS SD/SDSM system, including preliminary comparisons of MODIS and VIIRS SDSM on-orbit performance.

Paper Details

Date Published: 15 October 2012
PDF: 9 pages
Proc. SPIE 8510, Earth Observing Systems XVII, 85100H (15 October 2012); doi: 10.1117/12.930963
Show Author Affiliations
Xiaoxiong (Jack) Xiong, NASA Goddard Space Flight Ctr. (United States)
Amit Angal, Science Systems and Applications, Inc. (United States)
Taeyoung Choi, Sigma Space Corp. (United States)
Junqiang Sun, Sigma Space Corp. (United States)
Eric Johnson, Raytheon Space & Airborne Systems (United States)


Published in SPIE Proceedings Vol. 8510:
Earth Observing Systems XVII
James J. Butler; Xiaoxiong Xiong; Xingfa Gu, Editor(s)

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