To reach it, we must make following corrections: tide correction, time synchronism and GPS antenna offset.

文中分析了水位改正、时间同步改正和天线偏移改正的物理意义和数学模型。

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A new code acquisition method based on phase difference correction of FFT is presented to solve the problem of long code acquisition time in high dynamic DSSS receivers having large frequency offset.

针对大频偏下高动态直扩接收机伪码捕获时间长的问题，提出了一种新的基于FFT相位精确估计频偏的改进方法。

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