快速可靠的星图识别算法是星敏感器确定姿态的关键部分。综合当前多种星图识别算法,设计了实用快速的全天星图识别算法。根据星敏感器视场筛选导航星,构建最小星库;选择星对角距为识别特征,根据多星结构重复性选择星形识别算法;考虑误差,将星对角距离散化成数组,特征匹配无需搜索,直接查找表定位。实验证明本算法是一种速度快(首次捕获＜1 s)、存储空间小(＜1 MByte)、识别正确率高(＞99.99%)、抗假目标干扰强的全天星图识别算法,方便在嵌入式芯片上运行。

Rapid and reliable star recognition algorithm is the key element of star sensor's attitude determination. In this paper, a new practical and rapid all-sky star recognition algorithm combining with kinds of present star recongnition algorithms is designed. According to star sensor's FOV, guide stars are selected and minimum star catalog is built. The angular separation of star patterns is selected as recognition characteristics and the star shape recognition algorithm is selected by structure repeation of multiple stars. Considering of errors, the angular separation of star patterns are discreted as several groups, thus characteristic matching can directly seek the catalog instead of searching it. Experiment results show that this new algorithm is an advanced all-sky star recognition algorithm with advantages such as high speed, low storage room, high recognition accuracy and anti false target, etc. It is easy to operate in embedded chips.