特别是对于各种空间飞行器的天文实时定位能提供一个精确而快速的参考坐标系统。
Especially, It can rapid by provide a precise reference coordinate system for the astronomical orientation of various space vehicles at real time.
本文详细地论述了与GPS导航定位系统一系列有关的参考系统：时间系统、坐标系统和力模型系统。
Firstly, a series of reference systems, related to GPS navigation positioning system, such as timing system, reference frame and force model system, are discussed in detail.
它被选为一个火星的地理坐标系统的中心参考点。
It was chosen as a central reference point for Mars' geographical coordinate system.
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