Stray-light calibration and correction for the MetOp-SG 3MI mission

L. Clermont; C. Michel; E. Mazy; C. Pachot; N. Daddi; C. Mastrandread; Y. Stockman

doi:10.1117/12.2314208

10 July 2018 Stray-light calibration and correction for the MetOp-SG 3MI mission

L. Clermont, C. Michel, E. Mazy, C. Pachot, N. Daddi, C. Mastrandread, Y. Stockman

Proceedings Volume 10704, Observatory Operations: Strategies, Processes, and Systems VII; 1070406 (2018) https://doi.org/10.1117/12.2314208
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

The MetOp-SG 3MI mission is part of the EUMETSAT Polar System Second Generation (EPS-SG), an Earth observation Program for Operational Meteorology from Low Earth Orbit. It consists of two multi-spectral cameras, one operating in VNIR and one in SWIR. With 13 spectral channels between 410nm and 2130nm, including polarized channels, the instrument covers a semi-field of view of 57°. Due to tight stray-light specifications, on-ground calibration and post-processing correction are required. This paper covers the stray-light correction and calibration methods. The correction is indeed based on the on-ground measurement of Spatial Point Source Transmittance (SPST) maps. Due to the limited amount of maps which can actually be calibrated within a reasonable amount of time, an interpolation method was developed to deduce the stray-light behavior in the whole field of view of the instrument. Furthermore, dynamic range decomposition was required during the acquisition of the maps to get a high signal to noise ratio. Ray-tracing data from the 3MI optical model were used to evaluate the performance of the correction algorithm, including the contribution of SPST maps interpolation and acquisition errors.

Conference Presentation

Citation Download Citation

L. Clermont, C. Michel, E. Mazy, C. Pachot, N. Daddi, C. Mastrandread, and Y. Stockman "Stray-light calibration and correction for the MetOp-SG 3MI mission", Proc. SPIE 10704, Observatory Operations: Strategies, Processes, and Systems VII, 1070406 (10 July 2018); https://doi.org/10.1117/12.2314208

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