快速傅立叶变换方法实现快速卷积，比较好用-fast Fourier transform method to achieve rapid convolution, better quality

基于采样率变换和循环卷积的GPS信号快速捕获。提出了一种适用于GPS软件接收机的C/A码和多普勒频移的快速捕获算法。该算法结合了采样变换FFT和时域卷积两种方法，提高了捕获速度和多普勒频移的精度。-Based on the sampling rate conversion and fast circular convolution of the GPS signal capture. Presents a GPS receiver software for C/A code and Dopple

计算并显示滤波器的ambiguity function，分析滤波器的时间频域特性，使用卷积矩阵运算速度快-Calculates and displays the filter ambiguity function, time-frequency domain analysis filter characteristics, the use of fast convolution matrix operations