频移随机共振在信号检测中的应用

Detecting high frequency weak signal using frequency shifting stochastic resonance

基于傅立叶变换的频移特性,探讨双稳态系统中的高频随机共振现象.仿真结果表明,将输入信号的大频率移动到一个小频率后,双稳态系统的输出功率谱在此频率处的值得到明显增强.在一个较大的频率范围内检测强噪声背景下的弱信号的能力大大增强.

The phenomenon of stochastic resonance in a nonlinear bistable system stimulated by a high frequency periodic signal was investigated,based on the frequency shifting characteristic of Fourier transform.The simulation results showed that after shifting the input frequency to a small one,the output power spectrum peaks of the bistable system were strongly enhanced at this frequency.The ability of detecting weak signal overwhelmed in strong noise within a rather broad frequency range was improved in this way.