The simulation results indicate that the pseudo-range remaining errors will be increased with the distance between base-station and GPS user and in the case of low satellite elevation.
仿真结果表明用户和基准台之间距离增大和低卫星仰角都将使伪距残差增大，气象因素和高程对伪距残差也有影响。
It communicates with the base station via quad-band cellular signals or via satellite, allowing it to be deployed within a wide range of potentially hostile water, oil, gas and electricity networks.
这种系统通过四频蜂窝信号发生器或卫星与基站通讯，可以在一些潜在的不易操作的水、油、气和电力系统上广泛部署。
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