硬X射线调制望远镜卫星甚高精度星敏感器设计与在轨验证

Design and In-orbit Verification of Very High Accuracy Star Sensor Onboard HXMT Satellite

针对硬X射线调制望远镜(HXMT)卫星的高精度姿态测量需求,研制了一种基于定制CCD图像传感器的甚高精度星敏感器。文章介绍了甚高精度星敏感器的总体设计,包括结构设计、电子学设计、光学设计、软件和算法设计等方面,并进行了甚高精度星敏感器的地面观星试验和在轨验证,结果表明:甚高精度星敏感器惯性姿态测量精度可达到亚角秒级,相比市场上常规星敏感器的测量精度3″～10″有了进一步的提高。

A customized CCD based star sensor with very high accuracy is developed to meet the demand of the HXMT(hard X-ray modulation telescope)satellite.Design descriptions of this new star sensor are proposed,including mechanics,electronics,optics and baffle,software and algorithms,etc.Results of ground sky night observation verification and inflight performance are represented.The new proposed star sensor achieves sub-arcsec measuring accuracy,which is much higher than 3~10 arc-sec(3σ)of other star sensors extensively used on satellites.