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

The duffing 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 duffing 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.