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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Listen to me. James is a tracker.The hunt is his obsession. I read his mind.My reaction on the field set him off.

VOA: standard.other

The Blue Force Tracker uses satellite signals from friendly forces in the field to map their positions -- reducing the risk of so-called "friendly fire" incidents.

CNN: Technology links 101st on the battlefield