基于混合系统的微弱信号参数提取方法  

The Method of weak signal parameters extraction based on hybrid system

作　　者：张瑜[1] 贺秋瑞[1] 

机构地区：[1]河南师范大学物理与信息工程学院,河南新乡453007

出　　处：《舰船科学技术》2013年第2期13-16,67,共5页Ship Science and Technology

基　　金：国家自然科学基金(61077037)

摘　　要：针对强噪声背景下微弱正弦信号的幅值、频率、相位的提取,构建了锁相环和混沌振子组成的混合检测系统。把待测信号作为混沌振子的内置策动力,在周期状态下测得信号的频率。用锁相环锁定待测信号的相位。最后再次把信号输入到混沌系统,利用混沌振子对周期信号的敏感性和对噪声的免疫性来提取信号的幅值。仿真结果表明:该系统可实现对微弱正弦信号的频率、相位以及幅值进行有效提取,精度较高,抗噪性能好且操作简便易行。To extract the weak sine signal amplitude, frequency,phase from strong noise, a hybrid detection system of weak signal based on phase locked loop and chaotic oscillator was built. Take the measured signal as the internal motive power of chaotic oscillator, getting the frequency of the signal in the cycle state. Locking the phase by phase locked loop. At last, putting the signal into the chaotic system again, using periodic signal sensitivity and noise immunity of the chaotic oscillator to extract the amplitude of the signal. Simulation results show that：the system can extract the weak sine signal frequency, phase, amplitude effectively at the same time, its precision is higher, and noise immunity is good, the system is simple and easily operative.

关 键 词：微弱正弦信号 锁相环 混沌振子 混合检测系统 

分 类 号：TP911[自动化与计算机技术]