【摘要】 传统的微弱信号检测方法在信噪比较低时检测效果并不理想,利用混沌振子检测微弱信号具有灵敏度高、抗噪性强的特点,信噪比门限也比传统方法检测到的低得多,基于此对Duffing振子和Van der Pol-Duffing振子进行了耦合,建立了非线性微弱信号检测系统,并通过分岔图和二分法确定了临界点阈值,提高了阈值的求解速度和精度,最后分别对单微弱正弦信号和混合微弱正弦信号进行了检测,检测系统取得了较好的效果。更多还原

【Abstract】 The traditional weak signal detection method is not ideal when the signal-to-noise ratio is low.Using the chaotic oscillator to detect the weak signal has the characteristics of high sensitivity and strong anti-noise,and the SNR threshold is lower than that of the traditional method.Based on this,the Duffing oscillator and the Van der Pol-Duffing oscillator are coupled to establish a nonlinear weak signal detection system.The critical point threshold is determined by bifurcation and dichotomy to improve the speed and accuracy of the threshold.The single weak sinusoidal signal and mixed weak sinusoidal signal were detected.The system obtained good results.更多还原