System design and circuit implementation of stochastic resonance for underwater weak signals detection

In the field of weak signal detection, the nonlinear stochastic resonance system has been proved as an efficient approach for its property of transferring the energy of noise to periodic signals, which can be used for a variety of oceanic fields such as underwater acoustic communication, passive sonar detection, seismic wave detection, and etc. In this paper, a circuit system of large parameter stochastic resonance is designed and implemented with frequency shift normalized scale transformation, aiming to realize an enhancement of weak periodic signals. The circuit system based on stochastic resonance deals with continuous signals and can effectively overcome the problems as divergence may appears in numerical simulations. The analog circuit stochastic resonance system. A hardware analog circuit system with DSP as the control core is designed to realize rapid stochastic resonance detection of the weak signal of the higher frequency underwater, raise the frequency range of the detectable signal. Analog circuit system results show that the system circuit can achieve higher frequency signal stochastic resonance so as to effectively improve the system output.