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Proceedings Paper

Experience in in-flight calibration of MOS for three years
Author(s): Karl-Heinz Suemnich; Horst H. Schwarzer
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Paper Abstract

Long term orbit missions have the general problem of checking the instrument parameters in order to provide data with a high and equal reliability during the whole mission. Different methods of end-to-end or only partly recalibrations have been used in the past. The behavior of the first pushbroom imaging spectrometer in orbit, the Modular Optoelectronic Scanner MOS, has been observed during 3 years operation in orbit. Two procedures are used to check periodically some parameters: internal calibration with 2 minilamps in each module and external calibration with the sun irradiance onto a white diffuser in front of the entrance optic. The results show different developments of the parameters in the modules: increase of the dark current has not stopped up to now; the sensitivity of MOS-A channels remains constant in the frame of plus or minus 0.5%, while the MOS-B channels reach a constant level after a long period of increasing now. No wavelength shift could be observed. The PRNU of the CCD lines remains inside a plus or minus 1% interval. Spectral variations in the channel sensitivity of MOS-B can be observed and corrected with an uncertainty of plus or minus 0.5%. In general, the in- flight calibration methods allow to characterize the instrument parameters during the mission with an uncertainty of plus or minus 0.5%.

Paper Details

Date Published: 28 December 1999
PDF: 4 pages
Proc. SPIE 3870, Sensors, Systems, and Next-Generation Satellites III, (28 December 1999); doi: 10.1117/12.373204
Show Author Affiliations
Karl-Heinz Suemnich, DLR (Germany)
Horst H. Schwarzer, DLR (Germany)


Published in SPIE Proceedings Vol. 3870:
Sensors, Systems, and Next-Generation Satellites III
Hiroyuki Fujisada; Joan B. Lurie, Editor(s)

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