一种新的弱信号频率的提取方法

本文详细分析了Duffing混沌振子的阵发混沌机理及其间歇混沌现象的相关特性.基于混沌现象发生随模型参数变化的间歇性,提出了一种强背景中微弱信号频率的测量方法,并着重对白噪声或其它信号频率背景下微弱正弦信号频率的测量进行实验,给出了实验结果.结果表明,这种方法具有简单、有效、易于实现,精度高等特点.

New Measurement Method for Frequency of Weak Signal

The paper expounds the intermittent chaos theory of the Duffing oscillator and its character of intermittent chaos at first, and then a measurement method of frequency of weak signal is presented based on intermittent chaos resulting from minute change of system parameters. The paper places emphasis on analysing the computer simulation by taking the weak sinusoidal periodic signal in strong noise as an example. The result of experiments show that above method has many merits such as simple, effective, easy to be applied, less error etc compared with other detection methods.