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Proceedings Paper • Open Access

SEDHI: a new generation of detection electronics for earth observation satellites
Author(s): Didier Dantes; Claude Neveu; Jean-Marc Biffi; Christophe Devilliers; Serge Andre

Paper Abstract

Future earth observation optical systems will be more and more demanding in terms of ground sampling distance, swath width, number of spectral bands, duty cycle. Existing architectures of focal planes and video processing electronics are hardly compatible with these new requirements: electronic functions are split in several units, and video processing is limited to frequencies around 5 MHz in order to fulfil the radiometric requirements expected for high performance image quality systems. This frequency limitation induces a high number of video chains operated in parallel to process the huge amount of pixels at focal plane output, and leads to unacceptable mass and power consumption budgets.

Furthermore, splitting the detection electronics functions into several units (at least one for the focal plane and proximity electronics, and one for the video processing functions) does not optimise the production costs : specific development efforts must be performed on critical analogue electronics at each equipment level and operations of assembly, integration and tests are duplicated at equipment and subsystem levels.

Alcatel Space Industries has proposed to CNES a new concept of highly integrated detection electronics (SEDHI), and is developing for CNES a breadboard which will allow to confirm its potentialities.

This paper presents the trade-off study which have been performed before selection of this new concept and summarises the main advantages and drawbacks of each possible architecture. The electrical, mechanical and thermal aspects of the SEDHI concept are described, including the basic technologies : ASIC for phase shift of detector clocks, ASIC for video processing, hybrids, microchip module... The adaptability to a large amount of missions and optical instruments is also discussed.

Paper Details

Date Published: 21 November 2017
PDF: 12 pages
Proc. SPIE 10569, International Conference on Space Optics — ICSO 2000, 105690J (21 November 2017); doi: 10.1117/12.2307937
Show Author Affiliations
Didier Dantes, Alcatel Space Industries (France)
Claude Neveu, Alcatel Space Industries (France)
Jean-Marc Biffi, Ctr. National d'Études Spatiales (France)
Christophe Devilliers, Alcatel Space Industries (France)
Serge Andre, Alcatel Space Industries (France)

Published in SPIE Proceedings Vol. 10569:
International Conference on Space Optics — ICSO 2000
Georges Otrio, Editor(s)

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