Sentinel-5 on-ground calibration and characterisation
conference paper
The Sentinel-5/UVNS instrument (protoflight model) was characterised under flight-representative conditions between September 2023 and May 2024. This paper outlines the calibration approach and shows some first preliminary calibration key data (CKD) results. The Sentinel-5 instrument calibration and characterisation is the derivation of a data set of correction parameters, CKD, which will be used operationally to calibrate the in-orbit measurements. The calibration took place under thermal vacuum conditions at the Rutherford Appleton Laboratory (UK), while commanding of the instrument was performed remotely from Airbus Ottobrunn (Munich, D). This required nearly full automation of the ground support equipment (GSE), both the mechanical support of the instrument in the thermal vacuum chamber (TVC) on a 2-axis rotation system, and the optical GSE outside the TVC. Data processing of the calibration and characterisation measurements took place using a Quick Look Analysis Tool for initial data quality assessment. Definitive processing of the raw measurements and corresponding instrument and GSE telemetry is done iteratively: data are selected and pre-processed by the Level 1 Prototype Processor (L1bPP) to obtain (partially) calibrated data which are subsequently processed in the Calibration Analysis Tool (CAT) which produces the CKD. The CKD are then fed back into the L1bPP to apply the corrections in the pre-processing steps of the next type of characterisation measurements. The CAT processing follows in broad lines the correction steps as they are applied in the L1bPP and successively derives the necessary correction parameters and stores them in the CKD. The CKD contains: Detector chain parameters, spectral parameters, radiometric parameters, geometric parameters, and other parameters (in particular stray light).
Topics
TNO Identifier
1018566
ISSN
0277786X
Publisher
SPIE
Article nr.
1369926-1
Source title
ICSO 2024, International Conference on Space Optics, Antibes Juan-les-Pins, France, 21-25 October 2024
Editor(s)
Bernard, F.
Karafolas, N.
Kubik, P.
Minoglou, K.
Karafolas, N.
Kubik, P.
Minoglou, K.
Collation
14 p.