As a spacecraft attitude measurement instrument, CCD star tracker has a lot of advantages. But it needs an all-sky autonomous star map identification algorithm to support its operation.
CCD星跟踪器作为飞行器的姿态测量仪器有许多优点，它必须有一种全天自主星图识别算法来支持其工作。
Grid algorithm is a preferable star field identification algorithm. But it need many stars in FOV (field of view). Thereby CCD star tracker must have large FOV or be sensitive to dim stars.
栅格算法是一种较优秀的星图识别算法，但它要求视场中有较多的恒星，从而要求星跟踪器有大的视场或高的星等灵敏度。
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