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星模拟器是一种在地面上模拟星空，以便对飞行器的姿态识别系统－星敏感器进行功能测试的实验装置．星模拟器必须根据卫星在轨的位置，实时生成对应部分的天空星图，这就有一个坐标变换的问题．证明了对恒星方位来说，从地心天文坐标系到姿态坐标系的转换无需顾及坐标平移所带来的误差，即姿态坐标系可移至地心，只需考虑旋转变换．最后推导出实用的坐标变换公式，并据此完成了星场的实时星图编制
Star simulator is an experimental device that simulates the sky on the ground for function testing of the aircraft attitude recognition system - the star sensor. Star simulator must be based on satellite orbit position, the corresponding part of the real-time generation of the sky map, there is a problem of coordinate transformation. It is proved that the transformation from geocentric coordinate system to the attitude coordinate system does not need to take into account the error caused by coordinate translation for the stellar azimuth. That is, the attitude coordinate system can be moved to the geocentric center, and only the rotation transformation needs to be considered. Finally, a practical coordinate transformation formula is deduced, and a real-time star map of star field is completed accordingly