一种基于杜芬振子的微弱信号检测方法

A Method of Weak Signal Character Detection Based on Intermittent Chaos Moving

杜芬振子相变对与参考信号频差较小的周期弱信号具有敏感性,对白噪声和参考信号频差较大的周期干扰信号具有免疫力。在此基础上结合Labview和Matlab的接口技术提出了一种能在强噪声环境下检测弱信号的方法,该方法具有很好的信噪比,且在超声波弱信号检测得到了验证,具有良好的检测结果。

The dulling oscillator phase transform is sensitive to the weak signal having the tiny angular frequency difference with the referential signal, and immune against the random noise and the larger interference signal having larger angular frequency difference with the referential signal. A mehod using the dulling chaotic oscillator as the detection system is proposed based on the interface of Labview and Matlab, is able to estimate the frequency and amplitude of weak sinusoidal signals, and gains a good SNR. The weak ultrasonic signal included large noise is detected, the result shows that this method is effective and successful.