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

作　　者：龚国辉[1] 李思昆[1] 

机构地区：[1]国防科技大学计算机学院,湖南长沙410073

出　　处：《通信学报》2005年第7期76-81,共6页Journal on Communications

基　　金：国家自然科学基金资助项目(90207019);国家"863"计划课题资助项目(2002AA1Z1480)

摘　　要：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.

关 键 词：信息处理技术 C/A码相位测量 快速傅立叶变换:循环卷积:辅助式GPS接收机 

分 类 号：TN96[电子电信—信号与信息处理]