There are two primary methods of time dissemination around the world: two-way satellite time transfer_(TWSTT) and common-view Global Position System_(GPS) time transfer.
现行的高精度远距离时间传递方式主要有GPS共视法和双向卫星时间传递技术（TWSTT）。
With the demand of time synchronization between ground stations of satellite navigation system, the traditional time transfer methods are summarized systematically.
针对卫星导航系统站间时间同步的需求，系统地总结了传统的时间传递方法。
One of the important factors affecting the accuracy of two-way satellite time and frequency transfer (TWSTFT) is the satellite motion.
影响双向卫星时间频率比对(TWSTFT)准确度的一个重要因素是卫星的运动。
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