2FSK扩频系统中多普勒频移容限扩展的一种方法  

A method of Doppler shift tolerance extension in 2FSK spread spectrum communication system

作　　者：薛敏彪[1] 王坤[1] 党群[1] 

机构地区：[1]西北工业大学365所,陕西西安710065

出　　处：《电子设计工程》2012年第7期121-123,共3页Electronic Design Engineering

基　　金：国土资源部公益性行业资助项目(201011020-2)

摘　　要：在高动态扩频通信系统中,多普勒频移会导致匹配滤波器输出相关峰值降低而影响伪码的捕获。在分析相关峰所受多普勒频移影响的基础上,提出了一种扩展2FSK扩频通信系统的多普勒频移容限的方法,即适当缩短相关累加时间,伪码捕获和数据解调时采用相关累加与非相关累加相结合的方法。该方法可有效降低FSK扩频系统中相关峰对多普勒频移的敏感性,使多普勒频移容限得到较好的扩展。In the high dynamic spread spectrum communication system,the Doppler shift can decrease the correlation peak from the matched filter and influence the acquisition of PN code.On the basis of analyzing the impact of Doppler shift on the correlation peak,a method to extend Doppler shift tolerance in 2FSK spread spectrum communication system is proposed,that properly shorten the time of coherent integration,and combine coherent integration with incoherent integration together in PN code acquisition and data demodulation.This program is effective in reducing the correlation peak＇s sensitivity to Doppler shift,and the Doppler shift tolerance is effectively extended.

关 键 词：相关累加 非相关累加 多普勒频移 2FSK 

分 类 号：TN914[电子电信—通信与信息系统]