基于Duffing振子的DSSS信号载波检测方法

Carrier Detection Method of DSSS Signals Based on Duffing Oscillator

基于Duffing混沌振子检测微弱信号方法,提出一种DSSS/BPSK信号载波检测的新方法。该方法先介绍了Duffing振子检测微弱信号的技术,接着利用Duffing振子对小周期信号的敏感性和对噪声的免疫力,对DSSS/BPSK信号进行非线性平方变换能够检测出淹没在强噪声背景中的正弦信号。仿真结果表明,该方法能够在信噪比很低的情况下检测出DSSS/BPSK信号,而且性能良好。

In this paper, carrier detection scheme of DSSS/BPSK signals based on Duffing chaotic oscillator is presented. Technique of Duffing oscillator weak signal detection is introduced first. Then by making use of Duffing oscillator＇s sensibility to small periodic signals and immunity against noise, the sine signal is detected which derives from square transform of DSSS/BPSK signals and is submerged in strong noise. The results of simulation show that DSSS/BPSK signals can be detected by the presented method here under lower SNR and the performance is good.