当接近地面时，飞机突然失去控制导航系统也停止工作。

As it neared the ground, it lost power. Its navigation system stopped working.

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在GPS地面车辆导航系统中，需要将GPS接收机收到的数据在电子地图中实时地显示出来。

In ground vehicle navigation system with GPS, it is necessary that data in GPS receivers be displayed on the digital road map in real time.

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通过对地面卫星信号覆盖区内的多普勒频率偏移及不确定性范围的计算，给出了卫星导航系统信号的多普勒频率偏移与接收机位置之间的关系。

By calculating the Doppler shift and its uncertainty in the signal covering area, the relation between Doppler shift and the position of the receiver is obtained.

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