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Proceedings Paper • Open Access

Sentinel-5: monitoring and correction of charge transfer inefficiency using the instrument spectral response function of the spectrometer
Author(s): C. Keim; T. Gühne

Paper Abstract

Performance requirements result that todays’ imaging spectrometers as Sentinel-5 make use of array CCDs to simultaneously measure the entire spectrum of several adjacent spatial samples. Due to radiation doses accumulated during the mission lifetime, defects acting as traps for charges are generated in the silicon matrix. The charges captured therein result in a drop of charge transfer efficiency i.e. an increase of charge transfer inefficiency (CTI). CTI leads to a faint signal trail for each pixel in the opposite direction to the read out. In spectrographs this results into a smear out of the spectral content, leading to an error in the retrieved trace gas concentrations. However, similar to astronomical and imaging applications, the spectrum can be corrected in the post processing. In this paper an alternative approach is discussed, which incorporates the impact of CTI in the spectral response function (ISRF) of the instrument that consequently allows for monitoring of CTI evolution and correction of its impact.

Paper Details

Date Published: 25 September 2017
PDF: 9 pages
Proc. SPIE 10562, International Conference on Space Optics — ICSO 2016, 105624G (25 September 2017); doi: 10.1117/12.2296046
Show Author Affiliations
C. Keim, Airbus Defence and Space (Germany)
T. Gühne, Airbus Defence and Space (Germany)

Published in SPIE Proceedings Vol. 10562:
International Conference on Space Optics — ICSO 2016
Bruno Cugny; Nikos Karafolas; Zoran Sodnik, Editor(s)

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