基于Van der Pol―Duffing振子和互相关的微弱信号检测研究

Research on Weak Signal Detection Based on Van der Pol-Duffing Oscillator and Cross Correlation

传统的信号检测方法在背景噪声较强的情况下一般会失效,混沌振子由于对初始值及参数具有敏感性从而可以很好地检测到微弱信号。首先简述了应用Van der Pol―Duffing振子和互相关方法检测微弱正弦信号的原理,然后应用二者联合的方法进行微弱信号检测。该方法综合了互相关检测对噪声的抑制优势和Van der Pol―Duffing振子对微弱信号提取的优势。仿真实例表明,该方法能有效地检测出淹没在强噪声中的微弱正弦信号,且其信噪比门限比只用混沌振子方法更低,抗噪性更强。

The traditional signal detection method is generally ineffective in the case of strong background noise.The chaotic oscillator is sensitive to the initial value and the parameter to detect the weak signal well.Firstly,the principle of using Van der Pol-Duffing oscillator and cross correlation method to detect weak sinusoidal signal is briefly introduced,and then a method for weak signal detection is proposed.This method combines the advantages of cross correlation detection for noise suppression and Van der Pol-Duffing oscillator for weak signal extraction.The simulation results show that the proposed method can effectively detect the weak sinusoidal signal submerged in strong noise,and its SNR threshold is lower than that of chaotic oscillator.