Abstract
During the commissioning of the Sentinel-3B satellite, a single lunar observation was performed to assess the possible use of the moon for characterization and validation of onboard instruments. The observation was carried out in stable orientation after a roll maneuver, allowing the moon to be imaged by the Earth view of instruments. Data acquired by the Ocean Land Color Instrument (OLCI) allowed inflight verification of stray-light correction (SLC) performed by the Mission Performance Centre (MPC), and assessment of radiometric behavior of instrument in comparison with lunar irradiance models performed in cooperation between European Space Research and Technology Centre (ESTEC) and European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT). This paper describes the results of those activities along with the proposed update of stray-light correction developed with the use of lunar data.
Highlights
The Sentinel-3 (S3) mission is a part of the Copernicus Space Component (CSC)—the European Commission’s Earth Observation program
S3 payloads include Ocean and Land Colour Instrument (OLCI), Sea and Land Surface Temperature Radiometer (SLSTR), Synthetic Aperture Radar Altimeter (SRAL) and MicroWave Radiometer (MWR) along with instruments used for orbit determination
The GIRO model [10] has been developed by EUMETSAT in collaboration with United States Geological Survey (USGS)
Summary
The Sentinel-3 (S3) mission is a part of the Copernicus Space Component (CSC)—the European Commission’s Earth Observation program. During the S3B commissioning phase (summer 2018) a single lunar observation was performed to study the viability of collected data for calibration of instruments and to verify the possibility of routine moon observations for S3C and S3D satellites [2]: By nature, the moon presents several advantages for postlaunch characterizing and monitoring of the radiometric performances of space-borne instruments aboard spacecraft in the Earth’s orbit It is a relatively bright object against a very dark and cold background, which allows, for instance, an assessment and potential adjustments of stray-light corrections as performed by the on-ground image processing chains, e.g., [3]. In the case of a wide field of view imaging spectrometer, such as the OLCI, in some observation scenarios (cloud-free ocean pixels close to clouds or land covered by vegetation), stray-light might significantly contribute to radiances This issue is addressed with stray-light correction performed during Level-1 processing. Moon observation has proven to be a great opportunity to assess stray-light correction on-orbit
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