two-way satellite time transfer 卫星双向时间比对
ship-shore two-way satellite time transfer 岸船卫星双向时间比对
satellite two-way time transfer 卫星双向时间传递
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）。
Time transfer by laser pulses is based on the propagation of light pulses between satellite and ground clocks or between remote clocks on THC Earth.
激光时间传递是通过激光脉冲在空间的传播来实现地面与卫星时钟或地球上远距离两地时钟的同步。
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。
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