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Sensors 2018, 18(12), 4259; https://doi.org/10.3390/s18124259

A Stellar Imaging Error Correction Method Based on an Ellipsoid Model: Taking Ziyuan 3-02 Satellite Data Analysis as an Example

College of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
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Received: 29 September 2018 / Revised: 30 November 2018 / Accepted: 30 November 2018 / Published: 4 December 2018
(This article belongs to the Section Remote Sensors)
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Abstract

Stellar point image coordinates are one of the important observations needed for high-precision space attitude measurement with a star sensor. High-coupling imaging errors occur under dynamic imaging conditions. Using the results of preliminary star point extraction from star sensor imaging data combined with a superimposed time series, we analyze the relative motion and trajectory based on the star point image, establish an image error ellipsoid fitting model based on the elliptical orbit of a satellite platform, and achieve geometric error correction of a star sensors’ image star point using multi-parameter screening of the ambiguous solutions of intersection of the elliptic equations. The simulation data showed that the accuracy of the correction error of this method reached 89.8%, and every star point coordinate required 0.259 s to calculate, on average. In addition, it was applied to real data from the satellite Ziyuan 3-02 to carry out the correction of the star points. The experiment shows that the mean of attitude quaternion errors for all its components was reduced by 52.3%. Our results show that the estimation parameters of dynamic imaging errors can effectively compensate for the star point image observation value and improve the accuracy of attitude calculation. View Full-Text
Keywords: star sensor; stellar point imaging error; dynamic frame overlay; ellipsoid model; image star point compensation star sensor; stellar point imaging error; dynamic frame overlay; ellipsoid model; image star point compensation
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Wang, B.; Zhou, W.; Gao, Y.; Sheng, Q. A Stellar Imaging Error Correction Method Based on an Ellipsoid Model: Taking Ziyuan 3-02 Satellite Data Analysis as an Example. Sensors 2018, 18, 4259.

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