摘要
分析了Duffing振子的混沌特性,给出了确定系统混沌阈值的Melnikov方法.在阐述了基于相平面变化进行微弱信号检测原理后,在混沌检测中噪声对系统状态的影响也进行了研究.仿真结果表明,Duffing振子对与参考信号频率差较小的周期信号敏感,对白噪声和频差较大的周期干扰信号具有免疫力,该振子应用于实际微弱信号的检测具有可行性.
The chaotic character of Dulling oscillator is analyzed, and the Melnikov method of determining chaotic threshold of Dulling oscillators is discussed. The principle of weak signal detection based on the change of phase trace is described, and the influence of noise to the system status in the chaos detection process is also studied. Simulation experiments show that the oscillator is sensitive to the small signal having the tiny frequency difference with the referential signal and immune against the random noise and interference signal having larger frequency difference with the referential signal. The application of the oscillator to weak signal detection is feasible.
出处
《电子器件》
CAS
2007年第4期1380-1383,共4页
Chinese Journal of Electron Devices
基金
国家自然科学基金重大项目资助(50539140)
面上项目资助(50579022)
中国博士后科学基金资助(2006039251)
