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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 17 — Aug. 26, 2013
  • pp: 20096–20110

Motion-blurred star acquisition method of the star tracker under high dynamic conditions

Ting Sun, Fei Xing, Zheng You, and Minsong Wei  »View Author Affiliations


Optics Express, Vol. 21, Issue 17, pp. 20096-20110 (2013)
http://dx.doi.org/10.1364/OE.21.020096


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Abstract

The star tracker is one of the most promising attitude measurement devices used in spacecraft due to its extremely high accuracy. However, high dynamic performance is still one of its constraints. Smearing appears, making it more difficult to distinguish the energy dispersive star point from the noise. An effective star acquisition approach for motion-blurred star image is proposed in this work. The correlation filter and mathematical morphology algorithm is combined to enhance the signal energy and evaluate slowly varying background noise. The star point can be separated from most types of noise in this manner, making extraction and recognition easier. Partial image differentiation is then utilized to obtain the motion parameters from only one image of the star tracker based on the above process. Considering the motion model, the reference window is adopted to perform centroid determination. Star acquisition results of real on-orbit star images and laboratory validation experiments demonstrate that the method described in this work is effective and the dynamic performance of the star tracker could be improved along with more identified stars and guaranteed position accuracy of the star point.

© 2013 OSA

OCIS Codes
(100.2960) Image processing : Image analysis
(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:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: July 22, 2013
Revised Manuscript: August 4, 2013
Manuscript Accepted: August 9, 2013
Published: August 19, 2013

Citation
Ting Sun, Fei Xing, Zheng You, and Minsong Wei, "Motion-blurred star acquisition method of the star tracker under high dynamic conditions," Opt. Express 21, 20096-20110 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-17-20096


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