基于自相关和混沌理论的微弱线谱检测  

Detection of Weak Sine Signals Based on Auto-correlation with Chaos Theory

作　　者：石敏[1,2] 徐袭[2] 

机构地区：[1]水声对抗技术重点实验室 [2]91388部队

出　　处：《船海工程》2012年第4期161-164,共4页Ship & Ocean Engineering

摘　　要：提出基于自相关和混沌理论相结合的微弱线谱检测方法,对微弱信号进行自相关处理并进行初步消噪,输入到处于临界状态的混沌系统中进行微弱线谱检测。该方法利用相轨迹内径确定混沌临界状态阈值及区分混沌与大周期状态。仿真结果表明该方法较单一的混沌检测方法具有更好的检测效果,可用于任意初相位微弱信号的检测,且利用内径判别法较以往混沌判断方法更简单直观。A method based on auto-correlation with chaos theory for detecting weak line-spectra was proposed.The auto-correlation process was applied to preliminarily de-noise,and the auto-correlation of weak signal was imported into chaos system under critical state for weak line-spectrum detection.The minimal radius of phase contrail for determining limited value of chaos critical state and differentiating chaos and big period state was used in the method.Simulation results showed that the proposed method is prior to using chaos detection method only and it is suitable to detect weak line-spectra with arbitrary phase.Furthermore,the minimal radius discriminance is simpler and more direct than other chaos judgement method.

关 键 词：自相关 混沌理论 微弱线谱检测 相轨迹内径 

分 类 号：U666.16[交通运输工程—船舶及航道工程] TN911.711[交通运输工程—船舶与海洋工程]