Stray-light; correction algorithm; Space optics; optical design; post-processing; astronomical telescope; earth observation; European Space Agency; straylight
Abstract :
[en] 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.
Research Center/Unit :
CSL - Centre Spatial de Liège - ULiège STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Clermont, Lionel ; Université de Liège - ULiège > CSL (Centre Spatial de Liège)
Michel, Céline ; Université de Liège - ULiège > CSL (Centre Spatial de Liège)
Mazy, Emmanuel ; Université de Liège - ULiège > CSL (Centre Spatial de Liège)
Pachot, Charlotte; European Space Agency (ESA)
Daddi, Nicolo; Leonardo S.p.A, Airborne and Space Systems
Mastrandread, Carmine; Leonardo S.p.A, Airborne and Space Systems
Stockman, Yvan ; Université de Liège - ULiège > CSL (Centre Spatial de Liège)
Language :
English
Title :
Stray-light calibration and correction for the MetOp-SG 3MI mission
Publication date :
June 2018
Event name :
SPIE Astronomical Telescopes + Instrumentation
Event organizer :
SPIE
Event place :
Austin, Texas, United States
Event date :
from 10-06-2018 to 15-05-2018
Audience :
International
Main work title :
Proceedings Vol. 10704: Observatory Operations: Strategies, Processes, and Systems VII
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