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).
针对卫星精密定轨过程中观测资料存在粗差以及观测资料的合理定权问题，将抗差方差分量估计引入到卫星精密定轨中。
In this paper, the robust variance component estimation is introduced into the satellite orbit determination to resist the effects of outlying observations and to determine the weights.
低轨重力卫星轨道的精确确定是获得精密地球重力场模型的前提，而精密重力场模型又是获得高精度定轨结果的保证。
On the other hand, the precision gravity model is important guarantees for obtaining high precision orbiting results using the dynamic or reduced-dynamic orbit determination method.
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