论文部分内容阅读
导航星表构建是星敏感器设计阶段的重要工作。对于小视场,受限于恒星分布规律,易出现导航星表“空洞”问题。为解决小视场条件下均匀完备导航星表构建问题,对基于球面螺旋基准点的导航星表构建方法进行了改进:摒弃了原方法通过改变球面螺旋基准点数量和位置重新构建导航星表的思路,转而通过增选部分恒星来达到减少星表“空洞”的目的。设立了描述恒星消除星表“空洞”能力的权值,并以该权值递减顺序开展恒星增选;同时,设计了增选恒星距离阈值条件以保持增选后导航星表的均匀性。仿真表明,在4°圆形视场条件下,相对于原方法,文中方法得到的导航星表,总星数减少708颗,均匀性指标提高约44%,而星表“空洞”变化较小,显示了较好的性能。
Navigation satellite table construction is the star sensor design phase of the important work. For a small field of view, subject to the laws of the distribution of stars, prone to navigation table “hole ” problem. In order to solve the problem of building a uniform and complete navigation catalog in a small field of view, the method of building a navigation catalog based on a spherical reference point is improved: the idea of reconstructing the navigation catalog by changing the number and position of the spherical reference points , Instead by adding some of the stars to reduce the catalog “hole ” purpose. Set up to describe the stellar elimination of stellar table “hole ” capacity weights, and in order of decreasing weight star stellar selection; the same time, the design of the stellar stellar distance threshold conditions in order to maintain the consistency of the navigation board . The simulation results show that under the 4 ° circular field of view, compared with the original method, the total number of stars reduced by 708 stars and the uniformity index increased by about 44%, while that of the star table “void ” Smaller, shows better performance.