调参级联随机共振系统加强策略

Strengthening strategy of parameter-tuning cascaded stochastic resonance

为了更好地实现微弱信号的检测,提高输出信号的信噪比,提出三级级联随机共振加强系统.研究阻尼系数和系统形状参数对级联系统发生随机共振现象的影响,通过分别调节每级主控参数(阻尼系数、跃迁宽度和跃迁阈值),使得级联随机共振系统的输出性能明显优于传统方法,证实了选取合适的系统参数,能够实现大参数微弱信号的检测;有针对性地对参数进行设置,可以控制系统输出,提高输出信噪比.仿真数据与实际应用表明,该方法简单可行,根据需求设置参数能够实现强噪声背景下微弱信号的检测.

The enhanced system of three level cascaded stochastic resonance was proposed in order to realize the detection of the weak signal and improve the signal to noise ratio of the output signal.Effect of stochastic resonance phenomenon of the cascade system with damping coefficient and system shape parameters was analyzed.The output performance of the cascaded stochastic resonance system is obviously better than that of the traditional method by adjusting the main control parameter（damping coefficient,transition width,transition threshold）of each level.The detection of weak signal of large parameters was realized through choosing appropriate parameters of the system.The system respond was controlled and the output signal noise ratio was improved by purposely setting parameters.Simulation data and practical application show that the method is simple and feasible,and can detect weak signal in strong noise background according to the demand.