基于混沌系统的水下目标辐射噪声线谱检测

英文篇名：Detection of underwater target radiated noise line-spectra based on chaos system
中文刊名：舰船科学技术
英文刊名：Ship Science and Technology
作者：石敏 ; 徐袭
英文作者：SHI Min1 ; 2 ; XU Xi2(1.Science and Technology on Underwater Acoustic Antagonizing Laboratory ; Zhanjiang 524022 ; China ; 2.No.91388 Unit of PLA ; Zhanjiang 524022 ; China)
中文关键词：混沌系统 ; 辐射噪声 ; 微弱信号检测 ; 内径
英文关键词：chaos system ; radiated noise ; weak signal detection ; minimal radius
出版日期：2013-05-15
机构：水声对抗技术重点实验室;中国人民解放军91388部队;
年：2013
期：05
出版单位：舰船科学技术

摘要

针对水下目标辐射噪声具有频率低和强宽带背景噪声的特点,研究基于混沌理论的微弱信号检测方法。首先,根据混沌系统相轨迹内径随内置信号幅度变化的关系曲线确定任一频率下的混沌临界状态阈值。然后,在处于临界状态的混沌系统中注入待测的水下目标辐射噪声信号,依据频率-内径图进行待测信号检测。仿真结果表明该方法能实现微弱线谱检测,且较以往的混沌状态判据方法更简单直观。
Underwater target radiated noise possesses the feature of low frequency and strong broad band background noise.A method based on chaos theory for detecting weak signal is studied in the paper.Firstly,the limited value of chaos critical state under any frequency is determined by relationship curve between the minimal radius of phase contrail and amplitude of inner signal.Then underwater target radiated noise is injected into chaos system which is under critical state.Detecting the testing signal based on frequency-minimal radius figure.Simulation result show that the proposed method can realize weak line-spectrum detection and is simpler and directly than other chaos judgement method.

引文

[1]GAO X,YU J B.Chaos in the fractional order periodicallyforced complex duffing's oscillators[J].Chaos SolitonFract,2005,24:1097-1104.
    [2]李月,杨宝俊,袁野,等.混沌振子检测系统的弱有效地震信号检测能力[J].科学通报,2006,51(14):1710-1716.
    [3]楼天良.基于混沌理论的微弱线谱信号检测研究[J].舰船科学技术,2009,31(1):96-99.
    [4]郑思仪,郭红霞,李亚安,等.一种用duffing振子检测舰船辐射噪声线谱的新方法[J].科学通报,2007,52(3):258-263.
    [5]陈伟根,张嵩,杜林,等.基于互相关与混沌检测相结合的光声信号检测方法[J].电力自动化设备,2008,28(3):22-26.CHEN Wei-gen,ZHANG Song,DU Lin,et al.Photoacousticsignal measuring based on cross-correlation analysis andchaotic detection[J].Electric Power AutomationEquipment,2008,28(3):22-26.
    [6]陈伟根,云玉新,杜林,等.基于互相关和李雅普诺夫指数的微弱正弦信号混沌检测[J].电子系统自动化,2008,32(18):44-48.
    [7]侯楚林,熊萍,王德石.基于互相关与混沌理论相结合的水下目标信号检测[J].鱼雷技术,2006,14(5):17-19.HOU Chu-lin,XIONG Ping,WANG De-shi.Detection ofunderwater target signals by combining cross-correlationwith chaos theroy[J].Torpedo Technology,2006,14(5):17-19.