基于变尺度频移带通随机共振的多频微弱信号检测方法

摘要

Aiming at the detection problem of the multi-frequency signal under noise background,a novel method based on re-scaling frequency-shifted band-pass stochastic resonance (RFBSR) is proposed.Different frequency bands of the signal are processed by re-scaling sub-sampling compression,so as to make each frequency band meet the conditions of stochastic resonance.Further the weak signal frequency components are enhanced through stochastic resonance system.Before the enhanced components of the signals are synthesized,they are processed through band-pass filter only leaving the enhanced sections of the signal,to achieve the detection of multi-frequency weak signals.The results of analysis of the simulation and actual signals show that the proposed method is a simple way to detect multi-frequency weak signals,and can effectively improve the signal-to-noise ratio and has a good prospect of engineering application.%针对噪声背景下多频微弱信号检测难题,提出一种基于变尺度频移带通随机共振的多频微弱信号检测方法.首先对信号不同频段进行频率变尺度二次采样压缩处理,使每个频段满足随机共振条件.再经过随机共振系统使多个微弱信号频率成分分别得到增强,各段增强信号在合成前对各个频段的共振输出进行带通滤波处理,只保留增强段的信号成分.最后将得到的分段加强信号进行合成,实现多频微弱信号的检测.仿真和实际信号分析结果表明,所提方法简单易行,很好地实现了多频微弱信号的检测,能有效提高信噪比,具有良好的工程应用前景.