Instrumentation, Measurement, and Metrology

Novel approach for laboratory calibration of star tracker

[+] Author Affiliations
Hai-bo Liu

National University of Defense Technology, College of Science, Institute of Engineering Physics, Changsha, Hunan 410073, China

Xiu-jian Li

National University of Defense Technology, College of Science, Institute of Engineering Physics, Changsha, Hunan 410073, China

Ji-chun Tan

National University of Defense Technology, College of Science, Institute of Engineering Physics, Changsha, Hunan 410073, China

Jian-kun Yang

National University of Defense Technology, College of Science, Institute of Engineering Physics, Changsha, Hunan 410073, China and National Laboratory of Space Intelligent Control, Beijing, China, 100190

Jun Yang

Xi’an Military Academy, Teaching and Research Section of Science and Culture Basis, Xi’an, Shanxi, 710108, China

De-zhi Su

National University of Defense Technology, College of Science, Institute of Engineering Physics, Changsha, Hunan 410073, China

Hui Jia

National University of Defense Technology, College of Science, Institute of Engineering Physics, Changsha, Hunan 410073, China

Opt. Eng. 49(7), 073601 (July 14, 2010). doi:10.1117/1.3462042
History: Received February 09, 2010; Revised May 10, 2010; Accepted May 18, 2010; Published July 14, 2010; Online July 14, 2010
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An autonomous star tracker is an opto-electronic instrument used to provide the absolute three-axis attitude of a spacecraft utilizing star observations. The precise calibration of the measurement model is crucial, as the performance of the star tracker is highly dependent on the star camera parameters. We focus on proposing a simple and available calibration approach for a star tracker with wide field of view. The star tracker measurement model is described, and a novel approach for laboratory calibration is put forward. This approach is based on a collimator, a two-dimensional adjustable plane mirror, and other ordinary instruments. The calibration procedure consists of two steps: (1) the principal point is estimated using autocollimation adjustment; and (2) the other camera parameters, mainly the principal distance and distortions, are estimated via least-squares iteration, taking into account the extrinsic parameters. To validate this proposed calibration method, simulations with synthetic data are used to quantify its performance considering the errors of the distortion model and calibration data. The theoretical analysis and simulation results indicate that the uncertainties of the measured star direction vectors are less than 4.0×105rad after calibration, and this can be further improved.

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© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Hai-bo Liu ; Xiu-jian Li ; Ji-chun Tan ; Jian-kun Yang ; Jun Yang, et al.
"Novel approach for laboratory calibration of star tracker", Opt. Eng. 49(7), 073601 (July 14, 2010). ; http://dx.doi.org/10.1117/1.3462042


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