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Centroid error compensation method for a star tracker under complex dynamic conditions.

Tan, Wenfeng and Qin, Shiqiao and Myers, R. M. and Morris, T. J. and Jiang, Guangwen and Zhao, Yingwei and Wang, Xingshu and Ma, Liheng and Dai, Dongkai (2017) 'Centroid error compensation method for a star tracker under complex dynamic conditions.', Optics express., 25 (26). pp. 33559-33574.

Abstract

The traditional approach of a star tracker for reducing the dynamic error concentrates on a single frame of star images. Through correlating adjacent star images together with their angular relations sensed by a gyroscope unit (GU), the attitude-correlated frames (ACF) approach expands the view from one single frame to frame sequences. However, the star centroid is shifted from the star true position at the center time of the exposure period under complex dynamic conditions, which is called the complex motion induced error (CMIE) in this paper. The CMIE has a large effect on the performance of the ACF approach. This paper presents a method to compensate the CMIE through reconstructing the star trajectory with the angular velocity of the star tracker sensed by a GU, which achieves effective compensation of the CMIE crossing the boresight direction. Since the observation sensitivity to the CMIE along the boresight direction is low, the attitudes from two different fields of view (FOVs) are combined to improve its compensation accuracy. Then the ACF approach is applied to the obtained results where the CMIE has already been compensated completely. Simulations under shipboard dynamic conditions and experiments under oscillating conditions indicate that the proposed method is effective in improving the performance of the ACF approach and reducing the dynamic error of a star tracker under complex dynamic conditions.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1364/OE.25.033559
Publisher statement:© 2017 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
Date accepted:19 December 2017
Date deposited:19 March 2018
Date of first online publication:22 December 2017
Date first made open access:No date available

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