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。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 ;介绍了导航星的选取规则、导航星库的存储内容及采用球矩阵存储和读取导航星库的方法 ;用 1 2 0 MHz主频的微机模拟分析了门限和位置噪声对识别及识别时间的影响。在门限取 0 .0 5°,位置噪声 (单轴 )δ=0 .0 2°以下时 ,在任一区域的识别率达 1 0 0 % ,识别时间平均少于 0 .2 s。
The current method for measuring satellite attitude with star sen sor has the highest measuring accuracy and its key problem is to identify stella r map.A match identification method only using the observed star position inform ation and the cluster match with the star diagonal destance between the observe d star map and the guide star catalog.The star identification process is explain ed by graph theory.The selecting rule for guide star,the storing content of the guide star catalog,spherical matrix storing and the method for reading guide sta r catalog are presented.The influence of threshold and position noise on identifi cation and identification time are simulated with 120MHz main frequency microcom puter.When the threshold is 0.05° and position noise (single axis) δ is l ess than 0.02°,the identification efficiency is as high as 100% in any region,t he even identificaiton time is less than 0.2s.
出处
《光电工程》
CAS
CSCD
2000年第5期5-10,共6页
Opto-Electronic Engineering
