基于Duffing振子的BPSK载波信号检测方法研究  

BPSK carrier signal detection based on Duffing oscillator

作　　者：吴勇峰[1] 张世平[1] 孙金玮[1] 李智[1] 

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,哈尔滨150001

出　　处：《高技术通讯》2011年第9期979-984,共6页Chinese High Technology Letters

基　　金：863计划（2007AA06Z228）资助项目.

摘　　要：针对低压配电网具有噪声干扰强、信号衰减大等问题，提出了用Duffing振子来检测BPSK载波信号的新方法。Duffing振子对微弱信号敏感，信号的不同相位将引起系统在混沌态与大尺度周期态之间的相变，该方法就是利用载波信号的相位引起的Duffing振子的相变，通过对该相变的判别来检测载波信号的相位信息。同时还分析了Duffing振子系统解x与系统解y之间的变化规律，并在此基础上提出一种用系统解的差值分布来判别相变的算法，相对其他相变判别方式该算法计算量小更适合工程应用。数值仿真和实验测试的数据表明，该方法在低信噪比条件下可以取得良好的检测效果。Considering the strong noise interference and the great signal attenuation in low voltage networks, the Duffing oscillator method for BPSK carrier signal detection is proposed. The Duffing oscillator is very sensitive to weak signals, and a different phase of signal will induce the Duffing oscillator system＇ s phase transition between the chaotic state and the large-scale periodic state. The method uses the identification of the Diffing oscillator＇ s phase transition induced by the carrier signal＇ s phase variation to detect the carrier signal＇ s phase information. At the same time, on the basis of analyzing the variation rules of the system solution x and y of the Duffing oscillator, a kind of algorithm for identification of phase transition using the difference distribution of the system solutions is presented, which needs less computation than other methods and is more suitable for engineering applications. The numerical simulation and experimental test show that this method can achieve the good detection effect in a low SNR environment.

关 键 词：DUFFING振子 相变 差值分布 BPSK 标准差 

分 类 号：TN911.23[电子电信—通信与信息系统]