Facet-based star acquisition method

Sheng Zheng; YuLong Tian; Jinwen Tian; Jian Liu

doi:10.1117/1.1794705

1 November 2004 Facet-based star acquisition method

Sheng Zheng, YuLong Tian, Jinwen Tian, Jian Liu

Author Affiliations +

Optical Engineering, Vol. 43, Issue 11, (November 2004). https://doi.org/10.1117/1.1794705

Abstract

Star acquisition is one of the most time-consuming routines in star-tracker operation. In the star image, a star point spread function (PSF) represents a near-Gaussian distribution. The star extraction consists in finding the highest-intensity pixel among the PSFs, collecting the adjacent pixels, and then calculating the star centroids in the star image plane. The candidate highest-intensity pixels are the maximum extremum points of the underlying intensity function of a digital star image. To extract star from the star image, the cubic facet model is applied to fit the underlying intensity surface in star acquisition procedure. A new extraction approach, using surface-fitting methods to approximate locally the image intensity function, and then using the partial derivatives of the fitted surface to make decisions regarding the maximum extremum points, is proposed. A number of experiments are carried out on simulated star images. The experimental results demonstrate that the proposed method is efficient and robust.

©(2004) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Sheng Zheng, YuLong Tian, Jinwen Tian, and Jian Liu "Facet-based star acquisition method," Optical Engineering 43(11), (1 November 2004). https://doi.org/10.1117/1.1794705

Published: 1 November 2004

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