The Multi-viewing, Multi-spectral, Multi-polarisation Imager (3MI) is one of the payloads that will be on board of the MetOp-SG “Satellite A”, developed to provide information on atmospheric aerosols. 3MI is a space-based, wide field-of-view polarimeter that is designed to acquire sequential images of the same ground target, which are then combined with multiple spectral views in both un-polarized and polarized channels. This article presents the On-Ground calibration results on the 3MI PFM payload. The calibration request the measurement of a set of Key Data Parameters (KDP). These are needed in an instrument model. In the frame of 3MI calibration additionally to the geometrical, spectral and radiometric KDP, polarization and Stray Light are also considered. Because of 3MI wide FOV and polarization performance, dedicated Ground System Equipment GSE have been developed. Test results of the PFM calibration campaign are discussed and lessons learnt for the next campaign are proposed.
The Multi-directional, Multi-polarization, Multi-spectral Imager (3MI) is one of the payloads that will be on board of the MetOp-SG “Satellite A”, developed to provide information on atmospheric aerosols. 3MI is a space-based, wide field-of-view polarimeter that is designed to acquire sequential images of the same ground target, which are then combined with multiple spectral views in both un-polarized and polarized channels.
This article presents the on-ground calibration approach for the 3MI payload. The calibration methodology starts from the challenging high level specifications down to the specification of adequate Key Data Parameters (KDP) introduced in an instrument model. An error budget allows to evaluate the required accuracy on each KDP and, consequently, to specify the needed Ground System Equipments for the calibration. The paper will present the facility and the developed GSE used to measure these KDP. Preliminary test results of the EM calibration campaign are addressed
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.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.