一种基于恒星分布的星敏感器导航星库制作方法

Establishment of a Navigation Star Database Based on Star Distribution

为了进一步提升星敏感器的定姿精度,分析了恒星的空间几何分布对姿态精度的影响,提出了一种基于恒星分布的星敏感器导航星库制作方法。在分析对比了现有星库的基础上,选择了精度较高的依巴谷星库作为基础星库,并剔除了暗星和双星以精简星库。遍历全天球对每个视场的星库中的空间几何分布进行分析对比,删除定姿较差的3颗星。对星库进行遍历补偿,保证了星库中恒星分布的均匀性。实验结果表明,全天球轨道测试中,本文方法制作星库的全天识别率为100%,且星颗分布数10颗以上天区占到97.64%,具有良好的覆盖性,同时有效提升了姿态精度。

In order to further improve attitude precision of star sensors, the influence of star spatial geometric distribution to attitude precision is analyzed and a method of establishing a navigation star database based on star distribution is proposed. On the basis of analyzing the current star database, Hipparcos is selected as the basic star database, while, dark-star and double-star arc deleted in the star database, and then star spatial geometric distribution in every FOV（Field of View） is analyzed and compared while traversing all-sky, three stars which determine the worst attitude precision are deleted. Finally, Traversing compensationof star database is executed to ensure the uniformity of star distribution. The experimental results show that all-sky recognition rate is 100%by using the star database made by the proposed method in all celestial orbit tests, and the areas with more than 10 stars distribution r account for 97.64%. The porposed method is of good coverage, and can effectively improve the attitude accuracy.