摘要
在扩频通信中,伪随机码的捕获是系统的核心和关键技术。在高动态多普勒存在的条件下,传统的伪码捕获方法捕获时间较长。本文详细介绍了一种基于部分匹配滤波(Partial matched filtering,PMF)与快速傅里叶变换(Fast Fourier transform,FFT)相结合的伪码快速捕获方法,使其对多普勒频移的使用范围大大提高,缩短了伪码捕获时间。最后用Matlab进行了仿真,验证了该方法的正确性和有效性。
Fast PN code acquisition is a key technique in spread spectrum communication system. Traditional PN code acquisition algorithm costs comparatively long time in highly dynamic Doppler shift situation. An algorithm based on partial matched filtering (PMF) and fast Fourier transform(FFT) is analyzed. The method enhances the usable range of Doppler shift and shortens the time of PN code acquisition. The simulation by using Matlab verifies that the algorithm is correct and effective.
出处
《数据采集与处理》
CSCD
北大核心
2008年第B09期101-104,共4页
Journal of Data Acquisition and Processing
关键词
捕获
多普勒频移
部分匹配滤波
快速傅里叶变换
acquisition
Doppler shift
partial matched filtering
fast Fourier transform