基于Duffing振子的微弱信号检测方法及其电路的实现

摘要

在介绍了Duffing振子用于微弱信号检测原理和方法的基础上,根据系统的状态方程,设计制作了基于Duffing振子的微弱信号检测电路,并且分别用20HZ和60HZ频率的正弦信号对电路进行了控制试验.利用混沌系统相变对周期小信号的敏感性和对噪声具有免疫力的特点,用此电路实现了在强噪声背景下的微弱正弦信号的检测.研究工作对应用硬件电路实现对工程中常见中低频信号在强噪声背景下的检测做了有益的探索.%In this paper, the principle and application of weak signal detection based on Duffing oscillator is analyzed. Then, we design the circuit of weak signal detection based on Duffing oscillator according to the system state equation. And the control test of the circuit that the sinusoidal signal frequency is 20Hz and 60Hz is researched. Finally, use the circuit to realize the weak sinusoidal signal detection under strong noise background by the phase relationship characteristic of sensitive to sinusoidal signal and immunity to noise. This study is a useful exploration in using hardware circuit to detect low-frequency signal under strong noise background.