Detection of the Weak Periodic Signal Base on the Stochastic Resonance of Frequency Modulation

The method of modulated stochastic resonance is proposed to realize the weak periodic signal distinguished from the strong noise in case of big parameter.Combining the modulation technology with the stochastic resonance theory,the weak signal detection in the heavy noise background by using random resonance technology is studied.From the spectrum analysis of signal in frequency modulation,the results indicate the stochastic resonance is easily generated when the low frequency signal acts on the bistable system.The method makes the characteristics of weak fault signal to be obvious and easily to capture.