微弱正弦信号的一种新的混沌检测系统  

The Detection of Weak Sine Signals Using Special Chaotic System

作　　者：李月[1] 祁放[1] 张铭[1] 杨宝俊[1] 

机构地区：[1]吉林大学,长春130012

出　　处：《仪器仪表学报》2004年第z1期19-20,共2页Chinese Journal of Scientific Instrument

摘　　要：用特定的Duffing-Holmes方程实现了强噪声背景下弱正弦信号的有效检测。并用梅尔尼科夫函数给出系统出现混沌状态的阈值。仿真实验表明该混沌系统对微弱正弦信号非常敏感,对任意零均值噪声均具有极强的抑制能力,系统信噪比工作门限可达到-90dB。The sine signal under strong noise background is successfully detected with a special chaotic system which is formed of the modified Duffing-Holmes equation.Chaotic threshold in chaos-based detection system is analytically determined by the Melnikov method.Simulation experiences show that the chaotic system is sensitive enough to correspond to weak sine signal and it can effectively restrain the strong noise.The system has a stable working-detection limit of-90dB.

关 键 词：特定混沌系统 Duffing-Homes方程 正弦信号 信号检测 信噪比 

分 类 号：TH7-55[机械工程—仪器科学与技术]