利用相邻帧中恒星不变矩相等的特性，寻找三颗恒星作为参考恒星组；
It finds three stars as reference star group used the character that star moment invariants are equal in neighbor frames.
参考星：已知位置和/或星等的恒星，用于确定图片的底片常数和光度校准。
Reference Stars: Star with known position and/or magnitude, that are used to find the plate constants and photometric calibration of an image.
目标模拟器用来模拟作为卫星姿态敏感器的参考目标(太阳、地球和恒星等)的环境特性。
Target simulators are used to simulate the environment character of reference objects (the sun, the earth and stars) as satellite attitude sensors.
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