Detection of Multi-frequency Weak Signals Based on Re-scaling Frequency-shifted Band-pass Stochastic Resonance
SHI Pei-ming1,DING Xue-juan1,HAN Dong-ying2
1. Institute of Electrical Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China;
2. Institute of Vehicles and Energy, Yanshan University,Qinhuangdao, Hebei 066004, China
Abstract：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.
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2013, Vol. 34 
