摘要
根据非线性双稳系统在噪声和弱周期信号作用下对低频成分的敏感性,提出了基于随机共振的微弱多频信号检测方法.将待检测的未知频率信号与已知频率的载波信号在混频器经外差法作用后产生差频与和频两种频率成分,通过调节载波频率可使差频在零频率点附近变动,从而使得双稳系统的输出发生特征极为明显的变化,为频率检测提供可靠的检测依据.理论分析和数值仿真结果表明该方法是有效、可行的,具有良好的应用前景.
A detection method for weak multi-frequencies signal based on stochastic resonance is proposed , according to that the non-linear bistable system is sensitive to the low frequency when applied noise and weak periodic signal. By applying heterodyne method at the frequency mixer for the unknown frequency signal to be detected and the known frequency carrier signal, two kind of frequency components that are difference frequency and sum frequency will be generated, the difference frequency can vary near the zero frequency when adjusting the carrier frequency, and the output characteristic of bistable system varies obviously, so it is a reliable detection basis for frequency detection. The theoretical analysis and the numerical simulation result indicate that this method is effective, feasible ,and has good application prospect.
出处
《应用基础与工程科学学报》
EI
CSCD
2008年第1期86-91,共6页
Journal of Basic Science and Engineering
基金
国家自然科学基金项目资助(50675214)
关键词
随机共振
双稳系统
微弱信号
频率检测
stochastic resonance
bistable system
weak signal
frequency detection
作者简介
毛谦敏（1966-），男，副教授．
通讯作者：林敏（1962-），男，教授．E—mail：linm@cjlu．edu．cn．
