根据卫星星历和时间数据计算卫星在天球坐标系中的坐标。

Based on satellite ephemeris and time data of the satellite coordinates of the celestial coordinate system.

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卫星精密定轨中，需要计算天球坐标系(CRF)到地球固联坐标系(TRF)之间的转换。

For precise satellite orbit determination, the transformation should be done between the Celestial Reference Frame (CRF) and the Terrestrial Reference Frame (TRF).

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首先提出在直角坐标系下将天球球面均匀地分成486个分区的方法——“内接正方体法”，实现导航星的快速检索。

With 486 partitions, an equal partition method of celestial sphere without overlap is firstly presented to speed up guide star indexing.

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首先提出在直角坐标系下将天球球面均匀地分成486个分区的方法——“内接正方体法”，实现导航星的快速检索。

With 486 partitions, an equal partition method of celestial sphere without overlap is firstly presented to speed up guide star indexing.

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