α噪声下自适应非线性耦合双稳随机共振弱信号检测

Adaptive coupled bistable stochastic resonance weak signal detection under α noise

在α噪声条件下,为实现微弱周期信号的检测,提出了以平均信噪比增益(A-SNRI)为衡量指标的自适应非线性耦合双稳随机共振系统。先通过调节α噪声参数,将此α噪声与待测信号输入非线性耦合双稳系统中,再通过自适应算法,得出最优系统参数以及耦合系数。实验结果表明,周期信号通过自适应非线性耦合双稳系统后发生了随机共振现象,其频谱图出现了陡峭的尖峰且信噪比增益效果提升明显,说明自适应非线性耦合双稳随机共振系统能够有效地检测出淹没在α噪声中的信号。

Under the α noise condition,average SNR gain is regarded as the measure index,an adaptive nonlinear coupled bistable stochastic resonance system is proposed to realize the weak periodic signal ’s coupled detection. By adjusting the optimal α noise parameter,the α noise and the signal to be measured are input to the nonlinear coupled bistable system. Then,the optimal system parameters and the coupled coefficient are obtained by the adaptive algorithm. The experimental results show that the periodic signal induces stochastic resonance in the adaptive nonlinear coupled bistable system,and its spectrum has a steep spike and the average SNR gain is improved obviously. It is shown that the adaptive nonlinear coupled bistable stochastic resonance system can detect the signal in the submerged α noise effectively.