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Proceedings Paper

Study on the faint star extraction technology with MEMS gyro aided APS star tracker
Author(s): Fei Xing; Borui Zhao; Ting Sun; Wei Xu; Zheng You
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Paper Abstract

Star tracker is the most accurate attitude sensor for satellite. Generally speaking, the higher the accuracy, the fainter the star can be sensed by the star tracker. How to extract the faint star from a star image is becoming a critical technology in dynamic condition for star tracker, especially using the APS (Active Pixels Sensor) detector. A novel APS star tracker with MEMS Gyroscope aided system was proposed in this paper that could extremely improve the detection effect and capability for the faint stars. During the exposure time of star tracker, the trajectory of star projection on the detector maybe occupy more than ten pixels due to the satellite rotation. In this situation, the signal-to-noise ratio will decline sharply, and the traditional star extraction method for faint star will take no effect. As a result, the accuracy of star tracker would decline sharply, even more, couldn’t work. Using the MEMS Gyroscope, the track of star projection can be predicated and measured, on the basis of which the deconvolution algorithm could be taken to recover the faint star signal. The accuracy of the star projection centroid could be improved obviously, and the dynamic performance of the star tracker would be improved by a magnitude. Meanwhile, the MEMS gyroscope has not less volume, mass and power consumption, which make it more suitable for the application of APS star tracker.

Paper Details

Date Published: 16 August 2013
PDF: 11 pages
Proc. SPIE 8912, International Symposium on Photoelectronic Detection and Imaging 2013: Low-Light-Level Technology and Applications, 891211 (16 August 2013); doi: 10.1117/12.2034305
Show Author Affiliations
Fei Xing, Tsinghua Univ. (China)
Borui Zhao, Tsinghua Univ. (China)
Ting Sun, Tsinghua Univ. (China)
Wei Xu, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Zheng You, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 8912:
International Symposium on Photoelectronic Detection and Imaging 2013: Low-Light-Level Technology and Applications
Benkang Chang; Hui Guo, Editor(s)

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