Instrumentation, Techniques, and Measurement

High-accuracy star sensor calibration based on intrinsic and extrinsic parameter decoupling

[+] Author Affiliations
Kun Xiong, Xinguo Wei, Guangjun Zhang, Jie Jiang

Beijing University of Aeronautics and Astronautics (BUAA), Key Laboratory of Precision Opto-Mechatronics Technology, Ministry of Education, School of Instrumentation Science and Opto-Electronics Engineering, No. 37 Xueyuan Road, Beijing 100191, China

Opt. Eng. 54(3), 034112 (Mar 24, 2015). doi:10.1117/1.OE.54.3.034112
History: Received December 26, 2014; Accepted March 3, 2015
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Abstract.  The performance of star sensors largely depends on the accuracy of the model parameter estimation carried out through calibration. Measurement errors in the calibration data would cause estimated values to deviate from the actual values and couple with one another. Only the intrinsic parameters estimated through calibration are useful to star sensors. Thus, the coupling between estimated intrinsic and extrinsic parameters would affect star sensor accuracy. High-accuracy star sensors are significantly affected by such coupling between the aforementioned parameters. This study investigates the coupling between extrinsic and intrinsic parameters through calibration residual and starlight pointing error. A calibration method based on the decoupling of intrinsic and extrinsic parameters is then proposed. The proposed method uses the invariance of intrinsic parameters and estimates intrinsic parameters through simultaneous optimizations with distinct extrinsic parameters. In both the simulations and the experiment, the decoupling calibration effectively improves the accuracy of the intrinsic parameter estimation. Using the same calibration data, the intrinsic parameters’ estimation precision of a high-accuracy star sensor increased by a range from 50.83 to 86.47%.

© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Kun Xiong ; Xinguo Wei ; Guangjun Zhang and Jie Jiang
"High-accuracy star sensor calibration based on intrinsic and extrinsic parameter decoupling", Opt. Eng. 54(3), 034112 (Mar 24, 2015). ; http://dx.doi.org/10.1117/1.OE.54.3.034112


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