基于滑动DFT和插值DFT算法的GPS信号载波跟踪方法

 在分析GPS接收机跟踪环路信号特征的基础上，将滑动离散傅里叶变换（DFT）算法和插值DFT频率估计算法相结合，提出一种在频域进行的载波跟踪方法。该方法首先根据捕获时得到的粗略载波频率估计值确定计算DFT值点的范围，然后利用滑动DFT算法计算这部分点的DFT值，最后利用插值DFT频率估计算法估计载波频率，进行跟踪环路中载波频率的更新。该方法计算复杂度低，便于实际应用。仿真结果显示，该方法能够对载波频率正确跟踪，验证了算法的可行性。

Carrier Tracking Method of GPS Signals Based on Sliding DFT and Interpolated DFT Algorithms

A frequency-domain carrier tracking method of GPS signals is proposed in this article. The sliding discrete Fourier transformation (DFT) algorithm and interpolated DFT algorithm are integrated to estimate carrier frequency according to the analysis of signals in the carrier tracking loop. The range of DFT points is first worked out based on the frequency estimated in the acquisition program. Then,DFT is performed on those points using the sliding DFT algorithm. Finally,carrier frequency is estimated based o...