el elevation transmitter
转台俯仰角度 Turntable Pitching Angle
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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。
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.
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