To overcome this fault, concept of main star is introduced, and in the process of star field identification, information of star view magnitude is used.
为了克服这一缺点，引入主星的概念，并在星图识别过程中加入星等信息。
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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