摘要
针对进出港口的舰船噪声低,难以检测的问题,采用了混沌振子检测理论,将其应用在舰船弱信号检测中.采用参数抑制法,同时设计了微弱信号的混沌检测系统.通过仿真计算,结果表明该系统能有效地提高检测的信噪比.文中还给出了一种简便判断系统是否处在混沌态的方法.
The Duffing oscillator is designed to detect weak signal under strong noise by means of the chaos theory. It is pointed out that Dulling equation expresses amplitude and frequency sensitive property when system transits from chaotic to great periodic motion and that frequency sensitive property fits for extraction of weak frequency variation through simulation. At the same time, simulation model, frame diagram and simulation result are given. The experiment results show this is a time-domain signal processing method which has a lower signal to noise ratio limit. Therefore, the model is useful to the simulation and evaluation for weak signal detection.
出处
《武汉理工大学学报（交通科学与工程版）》
2009年第1期161-164,共4页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
国防基金项目资助(批准号:51444060101JB1108)
关键词
混沌
信号检测
线谱
chaos
signal detection
line-spectrum
