基于Duffing振子的微弱FSK信号解调

The Demodulation of weak FSK Signal Based on Duffing Oscillator

基于Duffing振子的信号检测方法由于对微弱信号的检测效果好而受到广泛关注。现有的方法都依赖于对系统状态的准确判断,但目前并没有一种快速准确的系统状态判断方法。本文将Duffing振子应用于FSK信号的解调,通过比较Duffing振子输出序列的方差值,达到解调FSK信号的目的。实验表明该方法能有效检测FSK信号,并且检测效果优于传统的非相干检测方法。

The method of detecting weak signal based on Duffing oscillator is widely concerned due to its low SNR detection limit.However,it depends on identify the change of phase diagram,and there isn＇t an efficient method to achieve it.In this paper,a new method is proposed to demodulate FSK signal based on Duffing oscillator.It distinguishes two frequencies through the comparison of variance of Duffing oscillator output series,the experiment proves it could detect FSK signal efficiently and is superior to the traditional methods.