This paper introduces the distribution of GPS control net of hydro-junction, and analyzes on the precision design of GPS control net.

介绍了水利枢纽GPS平面控制网的布设，分析了GPS控制网的精度设计。

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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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