This method overcomes the limitations, imposed by low visibility, that are frequent with landmark navigation, and is also suitable for long - distance-range navigation.
它避免了利用地标导航因能见度带来的限制，并可应用于远程导航。
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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