摘要
采用星敏感器测卫星姿态是现行方法中精度最高的，其关键是星图识别。本文阐述了只采用观测星的位置信息，利用观测星图与导航星表的星对角距进行聚类匹配，根据观测星图的连通性进行匹配识别的方法，用图论理论解释了星识别过程；用１２０Ｍ主频的微机模拟分析了门限和位置噪声对识别时间的影响。在门限取０．０５°，位置噪声（单轴）δ＝０．０２°以下时，在任一区域识别率达１００％，识别时间平均少于０．２ ｓ。
The most accurate instrument for satellite attitude determination is star tracker now, in which the key problem is the identification of star map. In this paper, cluster match is performed only with the observed star position information and using the star angular distance between observed star map and guide star catalog, then match identification is made with respect to the connection of the observed star map, at last, utilizing the computer (main frequency 120M) simulation the effects of threshold and position noise on identification and identification time are analyzed. When the threshold is 0. 05°,position noise δ is less than 0. 02°, in any areas, the identification efficiency is 100%, and the average identification time is less than 0. 2s.
出处
《光学精密工程》
EI
CAS
CSCD
2000年第3期217-220,共4页
Optics and Precision Engineering
关键词
星敏感器
星识别
连通性
聚类
star tracker
star identification
connection
cluster
