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。
broad band the paper. relationship Underwater target radi background noise. A method ated noise based on Firstly, the limited value of chaos curve between the minimal radius underwater target radiated noise is injected into can realize weak line-spectrum detection and possesses the fe chaos theory for ature of detecting critical state under any fre low frequency and strong weak signal is studied in quency is determined by of phase contrail and amplitude of inner signal. Then chaos system which is under critical state. Detecting the figure. Simulation result show that the proposed method is simpler and directly than other chaos judgement method.
出处
《舰船科学技术》
北大核心
2013年第5期30-33,共4页
Ship Science and Technology
关键词
混沌系统
辐射噪声
微弱信号检测
内径
chaos system
radiated noise
weak signal detection
minimal radius
