高动态突发扩频通信中伪码和多普勒频移的快速捕获  

Fast Acquisition of PN Code and Doppler Shift in High Dynamic Burst Spread Spectrum Communication

作　　者：薛敏彪[1] 李勤芳[1] 党群[1] 

机构地区：[1]西北工业大学365研究所,陕西西安710065

出　　处：《现代电子技术》2011年第19期1-3,共3页Modern Electronics Technique

基　　金：陕西省2010年度工业攻关项目(2010K06-09)

摘　　要：在高动态突发扩频通信系统中,要求接收机在很短时间内实现伪码和多普勒频移的快速捕获。目标的高速运动使接收机基带信号中存在较大的多普勒频移。针对伪随机序列相关峰的多普勒频移敏感特性,分析了多普勒频移对伪码捕获和数据解调的影响,提出了采用单通道匹配滤波进行伪码捕获,采用三通道并行相关器搜索多普勒频移的接收机捕获方案。该方案可有效减少硬件资源消耗,同时缩短捕获时间。In the high dynamic burst spread spectrum communication system,it requires the receiver to achieve the fast acquisition of PN code and Doppler shift within a few symbol periods.There is a big Doppler shift in the receiver base-band signal due to the high-speed movement of the targets.Considering the correlation peak of random sequences is sensitive to the Doppler shift,the impact of Doppler shift on the PN code acquisition and data demodulation is analyzed,the receiver acquisition scheme of using a single-channel matched filter for PN code acquisition and adopting the three-channel parallel correlators to search the Doppler shift is proposed.This program is effective in reducing the consumption of hardware resources,while greatly reducing acquisition time.

关 键 词：扩频通信 多普勒频移 匹配滤波 并行多通道 

分 类 号：TN914-34[电子电信—通信与信息系统]