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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 5 — Mar. 10, 2014
  • pp: 6009–6024

Smearing model and restoration of star image under conditions of variable angular velocity and long exposure time

Ting Sun, Fei Xing, Zheng You, Xiaochu Wang, and Bin Li  »View Author Affiliations


Optics Express, Vol. 22, Issue 5, pp. 6009-6024 (2014)
http://dx.doi.org/10.1364/OE.22.006009


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Abstract

The star tracker is one of the most promising attitude measurement devices widely used in spacecraft for its high accuracy. High dynamic performance is becoming its major restriction, and requires immediate focus and promotion. A star image restoration approach based on the motion degradation model of variable angular velocity is proposed in this paper. This method can overcome the problem of energy dispersion and signal to noise ratio (SNR) decrease resulting from the smearing of the star spot, thus preventing failed extraction and decreased star centroid accuracy. Simulations and laboratory experiments are conducted to verify the proposed methods. The restoration results demonstrate that the described method can recover the star spot from a long motion trail to the shape of Gaussian distribution under the conditions of variable angular velocity and long exposure time. The energy of the star spot can be concentrated to ensure high SNR and high position accuracy. These features are crucial to the subsequent star extraction and the whole performance of the star tracker.

© 2014 Optical Society of America

OCIS Codes
(100.3020) Image processing : Image reconstruction-restoration
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(100.4145) Image processing : Motion, hyperspectral image processing
(120.6085) Instrumentation, measurement, and metrology : Space instrumentation

ToC Category:
Image Processing

History
Original Manuscript: January 21, 2014
Revised Manuscript: February 25, 2014
Manuscript Accepted: February 26, 2014
Published: March 6, 2014

Citation
Ting Sun, Fei Xing, Zheng You, Xiaochu Wang, and Bin Li, "Smearing model and restoration of star image under conditions of variable angular velocity and long exposure time," Opt. Express 22, 6009-6024 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-5-6009


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