Experience and results of long-term in-orbit sun calibration of the Modular Optoelectronic Scanner (MOS) on the Indian IRS-P3 mission

Horst H. Schwarzer; Karl-Heinz Suemnich; Andreas Neumann; Thomas Walzel; Gerhard Zimmermann

doi:10.1117/12.333643

21 December 1998 Experience and results of long-term in-orbit sun calibration of the Modular Optoelectronic Scanner (MOS) on the Indian IRS-P3 mission

Horst H. Schwarzer, Karl-Heinz Suemnich, Andreas Neumann, Thomas Walzel, Gerhard Zimmermann

Author Affiliations +

Proceedings Volume 3498, Sensors, Systems, and Next-Generation Satellites II; (1998) https://doi.org/10.1117/12.333643
Event: Remote Sensing, 1998, Barcelona, Spain

Abstract

The Modular Optoelectronic Scanner MOS was developed at the Institute of Space Sensor Technology/Berlin of the German Aerospace Center (DLR) and specially designed for observations of medium scale effects of the system surface-atmosphere. MOS consists of the two VIS/NIR imaging spectrometers MOS-A and MOS-B and the SWIR camera MOS-C. It was launched on March 21, 1996 on board the Indian Remote Sensing Satellite IRS-P3 together with the Indian Wide Field Scanner WIFS and an X-ray instrument. Two different in-orbit calibration devices are integrated into the MOS equipment: (1) the internal calibration system based on two minilamps and (2) the sun calibration based on spectralon diffusers for absolute radiometric recalibration and long-term stability check of the sensitivity. Thus it is possible to determine the actual relative calibration data with an accuracy of about 0.5%. The interpretation of the calibration data of the MOS-IRS mission in orbit for two years shows that all detector elements really are working normally. The behavior of the sensitivity of all elements of a CCD-line is nearly identical. Altogether, the sensitivity of the MOS-A channels remains constant in an interval of plus or minus 0.7%, increases by different amounts for the MOS-B channels up to 6% and decreases for MOS-C about 1%. The results of the in-orbit calibrations are the basis for a consistent interpretation of the remote sensing measurements of the environment.

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Horst H. Schwarzer, Karl-Heinz Suemnich, Andreas Neumann, Thomas Walzel, and Gerhard Zimmermann "Experience and results of long-term in-orbit sun calibration of the Modular Optoelectronic Scanner (MOS) on the Indian IRS-P3 mission", Proc. SPIE 3498, Sensors, Systems, and Next-Generation Satellites II, (21 December 1998); https://doi.org/10.1117/12.333643

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KEYWORDS

Calibration

Sun

Molybdenum

Diffusers

Stray light

Optoelectronics

Scanners

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