But Contaldi says that GPS synchronization is not nearly that accurate, because GPS satellite signals are themselves subject to gravitational time dilation.

然而卡洛·康泰迪说，用GPS人造卫星来同步时钟，远远达不到这个准确度，这是因为GPS人造卫星的信号本身也受到重力时间膨胀效应的影响。

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The long distance, high precision time synchronization is very important for SDH communication net, control of electric power system and satellite navigation system, etc.

远距离、高精度的时间同步对SDH通信网、电力系统调控和卫星导航系统等有着极其重要的意义。

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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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