Application of Stochastic Resonance for Detecting Weak Periodic Signals

Based on the stochastic resonance(SR) theory,taking a nonlinear bi-stable system as research object,the method of weak signal detection based on SR was discussed for the weak singles need to be detected in a strong background noise.This method was applied to detect the weak frequency component signals in the strong noise background.The theoretical analysis and numerical simulation indicated that this method is simple,robust and reliable.The result showed that the weak sinusoid signal of lower signal-to-noise ratio can be effectively extracted from heavy noise when the data length is short.