Due to the strong spatial inhomogeneity and temporal variability of atmosphere, especially water vapor , accurate modeling of path delay in GPS signals is necessary for high -accuracy position.
由于大气分布不均和不断的变化，尤其是大气中的水汽影响，使建立无线电信号路径延迟的精确模型在GPS高精度定位中非常必要。
The beam deflection method was employed to determine the temporal response and position sensitive properties of the PSD.
采用光束偏转法对其时间响应特性和位置敏感特性进行测定。
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