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Proceedings Paper

RTS effect detection in Sentinel-4 data
Author(s): Henrique Candeias; Xavier Gnata; Maximilian Harlander; Markus Hermsen; Rüdiger Hohn; Stefan Riedl; Michael Skegg; Christian Williges; Ralf Reulke
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Paper Abstract

The future ESA Earth Observation Sentinel-4/UVN is a high resolution spectrometer intended to fly on board a Meteosat Third Generation Sounder (MTG-S) platform, placed in a geostationary orbit. The main objective of this optical mission is to continuously monitor the air quality over Europe in near-real time. The Sentinel-4/UVN instrument operates in three wavelength bands: Ultraviolet (UV: 305-400 nm), Visible (VIS: 400- 500 nm) and Near-infrared (NIR: 750-775 nm). Two dedicated CCD detector have been developed to be used in the Focal Plane Subsystems (FPS), one for the combined UV and VIS band, the other covering the NIR band. Being a high resolution spectrometer with challenging radiometric accuracy requirements, both on spectral and spatial dimensions, an effect such the Random Telegraph Signal (RTS) can represent a relevant contribution for the complete system accuracy. In this work we analyze the RTS effect on data acquired during the FPS testing campaign with qualification models for the Sentinel-4/UVN detectors. This test campaign has been performed in late 2016. The strategy for the impact assessment of RTS is to measure the effect at room temperature and then to extrapolate the results to the at instrument operational temperature. This way, very-long lasting data acquisitions could be avoided since the RTS frequency is much lower at cryogenic temperatures. A reliable technique for RTS effect detection has been developed in order to characterize the signal levels amplitude and occurrence frequencies (flipping rate). We demonstrate the residual impact of the RTS on the global In-Orbit Sentinel-4/UVN instrument performance and products accuracy.

Paper Details

Date Published: 5 September 2017
PDF: 18 pages
Proc. SPIE 10402, Earth Observing Systems XXII, 104021B (5 September 2017); doi: 10.1117/12.2274310
Show Author Affiliations
Henrique Candeias, Airbus Defence and Space (Germany)
Xavier Gnata, Airbus Defence and Space (Germany)
Maximilian Harlander, Airbus Defence and Space (Germany)
Markus Hermsen, Airbus Defence and Space (Germany)
Rüdiger Hohn, Airbus Defence and Space (Germany)
Stefan Riedl, Airbus Defence and Space (Germany)
Michael Skegg, Airbus Defence and Space (Germany)
Christian Williges, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Ralf Reulke, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)


Published in SPIE Proceedings Vol. 10402:
Earth Observing Systems XXII
James J. Butler; Xiaoxiong (Jack) Xiong; Xingfa Gu, Editor(s)

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