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Proceedings Paper

Suppression of sun interference in the star sensor baffling stray light by total internal reflection
Author(s): Hiroyuki Kawano; Haruhiko Shimoji; Shoji Yoshikawa; Katsumasa Miyatake; Kazumori Hama; Shuji Nakamura
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Paper Abstract

We have developed a star sensor as an experimental device onboard the SERVIS-1 satellite launched in October 2003. The in-orbit data have verified its fundamental performance. One of the advantages of our star sensor is that the baffle has a small length of 120 mm instead of 182 mm in the conventional two-stage baffle design. The key concepts for light shielding are total internal reflection phenomena inside a nearly half sphere (NHS) lens and scattering light control by gloss black paint. However, undesirable background noise by the sun outside of the field of view (FOV) was observed in the corner of the FOV in the orbital experiment. Ray trace simulations revealed that slight scattering light on the specular baffle wall entered the NHS lens and reached the corner of the image sensor through the multi-reflection path inside the lens. It was found that the stray light path can be shielded effectively if the diameter of the aperture under the NHS lens was reduced. We redesigned the baffle and evaluated the light shielding ability with our sun interference test facility on the ground, and confirmed that the stray light was reduced below the acceptable level. As a result, the light shielding technique which we have proposed was proved to be effective for a small-size baffle. The redesigned star sensor is planned to be installed as a main attitude sensor for the SERVIS-2 satellite scheduled to be launched in February 2008.

Paper Details

Date Published: 14 October 2005
PDF: 10 pages
Proc. SPIE 5962, Optical Design and Engineering II, 59621R (14 October 2005); doi: 10.1117/12.625050
Show Author Affiliations
Hiroyuki Kawano, Mitsubishi Electric Corp. (Japan)
Haruhiko Shimoji, Mitsubishi Electric Corp. (Japan)
Shoji Yoshikawa, Mitsubishi Electric Corp. (Japan)
Katsumasa Miyatake, Mitsubishi Electric Corp. (Japan)
Kazumori Hama, USEF (Japan)
Shuji Nakamura, USEF (Japan)

Published in SPIE Proceedings Vol. 5962:
Optical Design and Engineering II
Laurent Mazuray; Rolf Wartmann, Editor(s)

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