一种基于自相关估计的水声直扩信号检测方法  

Detection method of acoustic direct-sequence spread-spectrum signal based on autocorrelation estimation

作　　者：王晓燕[1] 方世良[1] 朱志峰[1] 

机构地区：[1]东南大学水声信号处理教育部重点实验室,南京210096

出　　处：《东南大学学报（自然科学版）》2010年第2期248-252,共5页Journal of Southeast University：Natural Science Edition

摘　　要：利用直接序列扩频信号的自相关特性,提出了一种直扩信号相关峰累积检测方法.理论上分析了直扩信号的自相关特性,可知在伪码周期整数倍处可能会出现峰值,利用这些相关峰及其倍数关系可以对直扩信号进行判别.但由于信元信号与噪声的影响,这一系列相关峰并非连续稳定出现.在低载噪比时,一些自相关峰淹没在噪声中,直接对其检测比较困难.利用相关峰出现的周期关系,设计了相关峰累积检测器.该检测器不仅可以实现自动检验,而且可适用于低载噪比情况,具有实际应用价值.计算机仿真结果和海试数据都验证了该方法的可行性与实用性.A detection method of correlation peak cumulant is proposed based on the characteristics of direct sequence spread spectrum（DSSS） signal autocorrelation.Spectrum peaks may be obtained at the integral periods of pseudo code due to the characteristics of DSSS signal autocorrelation.These correlation peaks and their multiple relationships can be used to recognize DSSS signals.However the correlation peaks cannot be achieved steadily due to the affection of source signals and noise.With low carrier to noise ratio,some peaks are covered by the noise level and difficult to be detected.The detector of correlation peak cumulant is designed by utilizing the periodic relationships of correlation peaks.This detector,which is capable of automatic implement and suitable for low carrier to noise ratios,has practical application values.Computer simulation results and ocean test data verify the practicability and feasibility of the detection method.

关 键 词：非合作 自相关估计 直接序列扩频信号 

分 类 号：TN911.23[电子电信—通信与信息系统] TB566[电子电信—信息与通信工程]