| 引用本文: | 刘海波,王文学,陈圣义,等.利用星角距不变性标定星敏感器内部参数.[J].国防科技大学学报,2014,36(6):48-52.[点击复制] |
| LIU Haibo,WANG Wenxue,CHEN Shengyi,et al.Star tracker ground calibration based on the invariant of interstar angles[J].Journal of National University of Defense Technology,2014,36(6):48-52[点击复制] |
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| 利用星角距不变性标定星敏感器内部参数 |
| 刘海波1, 王文学2, 陈圣义1, 苏昂1, 张小虎1 |
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(1. 国防科技大学 航天科学与工程学院，湖南 长沙 410073;2. 中国人民解放军63861部队，吉林 白城 137001)
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| 摘要: |
| 提出了一种恒星角距不变的星敏感器内部参数的地面标定方法。较常见的星角距的标定方法不同的是，该方法利用对在0°附近的角度变化较敏感的恒星角距的正弦值建立观测方程；采用两步法分别估计焦距、主点和高阶畸变系数，并采用迭代优化的方法，获得最优估计值。为了确保标定精度，对观测时刻的导航星进行了视位置的修正。实验结果表明，采用星角距的正弦值建立观测方程，估计精度较高，采用考虑高阶畸变的改进正弦法标定后的星角距误差的均方根值为2.2×10-5rad。 |
| 关键词: 星敏感器 标定 星角距 畸变 恒星视位置 |
| DOI：10.11887/j.cn.201406009 |
| 投稿日期：2014-04-02 |
| 基金项目:航天支撑技术基金资助项目（HTZC-2012-NUDT-009）；国家自然科学基金资助项目（11272347） |
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| Star tracker ground calibration based on the invariant of interstar angles |
| LIU Haibo1, WANG Wenxue2, CHEN Shengyi1, SU Ang1, ZHANG Xiaohu1 |
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(1.College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China;2.The PLA Unit 63861, Baicheng 137001, China)
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| Abstract: |
| A calibration approach based on the invariant of interstar angles was put forward for star trackers. Compared with common approaches, the sine of interstar angle which provides greater sensitivity for the angle changes closed to 0° was adopted to construct the observation equation instead of its cosine. In the calibration procedure, the two-step approach was proposed to estimate the principal point, focal length, and distortion parameters. The iterative optimization was also proposed to get the optimal estimations. In order to improve the accuracy of calibration, the apparent position of star at the observing time was modified. The experimental results indicate that the sine method is more accurate; and the deviation root-mean-square of the measured interstar angle is 2.2×10-5 rad after calibrated. |
| Keywords: star tracker calibration interstar angle distortions apparent position of star |
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