FFT与循环卷积相结合的GPS信号C/A码相位测量算法

GPS signal C/A code phase measurement using FFT and circular convolution

提出了一种将FFT与循环卷积相结合的算法,可以快速高精度测量GPS信号的C/A码相位。算法的主要思想是在较低的采样频率下用FFT法对GPS信号C/A码相位进行粗测,然后用循环卷积法在更高的采样频率下根据粗测结果进行细测,从而以较低的计算量实现对GPS信号的C/A码相位高精度测量。该算法主要应用于辅助式卫星定位接收机的开发和高精度扩频测距等领域。

A method combining FFT and circular convolution proposed could resolve this problem. The method calculated the coarse C/A code phase under low sampling rate using FFT firstly, then increased the sampling rate and calculated the fine C/A code phase using circular convolution, so as to accurately measure the GPS signal C/A code phase with lower computational burden. The method is applicable to assisted SPS receivers and high precision DSSS range acquisition.