适用于星敏感器的星跟踪算法研究

Research on Star Tracking Algorithm Suitable for Star Sensor

为了解决全天球识别中星像坐标提取速度慢的问题,提高空间飞行器姿态确定的实时性,提出了一种新的星跟踪算法。该算法根据星敏感器在一次全天球识别后能够获得一定先验信息的特点,利用星敏感器在上一时刻采集的星图中已识别观测星的信息来获取星敏感器下一时刻采集的星图中待识别观测星的信息。仿真结果表明该算法不但提高了星像坐标提取的速度,也由此提高了星敏感器的姿态更新率,从而避免了由于全天球识别导致的误匹配。

A novel star tracking algorithm is presented to solve the problem of obtaining location of star slowly in the course of Lost-in-Space case, as well as reducing the time spent in calculating the attitude of spacecraft. The knowledge of recognized stars in previous star image could be used to obtain the knowledge of observed star in current star image with the star tracking algorithm based on the fact that the sufficient attitude knowledge including location of recognized stars in star image could be obtained by star sensor after Lost-in-Space case. The simulation results show that the algorithm in this paper not only reduces the time spent in obtaining location of star to improve update rate of attitude, but also avoids fault star identification with Lost-in-Space case.