一种同时估计直扩信号伪码周期及码片速率的方法  

An Approach to Estimate The Pseudo-code Period and Chip Rate of Direct Sequence Spread Spectrum Signals Simultaneously

作　　者：张天骐[1] 李雪松[1] 代少升[1] 杨柳飞[1] 

机构地区：[1]重庆邮电大学,重庆400065

出　　处：《舰船电子对抗》2008年第3期77-83,98,共8页Shipboard Electronic Countermeasure

基　　金：国家自然科学基金-中物院NSAF联合基金项目(10776040);国家自然科学基金项目(60602057);重庆市科委自然科学基金项目(CSTC:2006BB2373);重庆市教委自然科学基金项目(KJ060509;KJ080517);重庆邮电大学自然科学基金项目(A2006-04;A2006-86)

摘　　要：在直扩(DSSS)通信的非合作无线电侦测、通信管理和管制等领域中,首要任务就是必须检测与估计到DSSS信号及有关参数,包括DSSS信号的伪码周期、码片速率等。由于DSSS信号的功率谱密度通常很低,往往被噪声淹没,致使常规的信号检测与估计方法无法直接应用。针对DSSS信号检测及其伪码周期、码片速率估计问题,综合了有关DSSS信号处理的相关处理方法,提出了可以同时检测DSSS信号并估计其伪码周期、码片速率参数的自相关方法。理论分析和实验表明所提出的方法在较低信噪比的环境下完全能对DSSS信号及其参数做出有效的检测与估计。The first task in the fields of non-cooperative radio surveillance, communication management and control of direct sequence spread spectrum（DSSS） communication is to detect and estimate the DSSS signals and the related parameters, which includes pseudo-code period, chip rate, etc. Because the power spectrum density of DSSS signal is often too low to be covered by noises,so that the normal methods of signals detection and estimation could not be applied directly. Aiming at the problem of detection of DSSS signals, pseudo-code period and chip rate estimation, this paper synthesizes the correlation methods of DSSS signals processing, proposes the auto-correction method which can detect the DSSS signals and estimate the parameters of pseudo-code period and chip rate simultaneously. Theory analysis and experiment results show that the proposed methods can effectively detect and estimate the DSSS signals and their parameters under the low signal noise ratio environment.

关 键 词：直扩信号 功率谱密度 自相关 

分 类 号：TN915[电子电信—通信与信息系统]