电讯技术2017，Vol.57Issue(6)：678-684,7.DOI:10.3969/j.issn.1001-893x.2017.06.011
改进高阶Vanderpol振子在微弱信号检测中的应用
Application of Improved Higher Order Vanderpol Oscillator in Weak Signal Detection
摘要
Abstract
The signal will be submerged by strong noise in the high precision weak photoelectric signal detection system.A novel approach for quantitative detection of weak sine signal based on Vanderpol oscillator is proposed to solve this problem.The new method improves the reliability of weak signal detection by refining the high order generalized Vanderpol oscillator with higher sensitivity and stronger noise immunity.At the same time,quantitative judgment of the state of chaotic system is achieved with Lyapunov index and higher precision extraction of the signal parameters is realized by combining Lyapunov index with 90 degrees phase shift compensation.Simulation result shows that the improved Vanderpol oscillator has faster computing speed than the traditional one.The improved Vanderpol oscillator can obtain 37 dB signal-tonoise ratio(SNR) gain and 60 dB detection threshold gain compared with the traditional Duffing oscillator in the range of 5％ amplitude detection error.The detection based on 90° phase shift compensation can control the relative error within 2％ compared with the amplitude and phase detection based on phase trajectory mutation when the SNR is reduced.Therefore the high sensitive and precise detection of weak signal 's amplitude and phase is realized.关键词
电力系统/微弱信号检测/混沌系统/Vanderpol振子/移相补偿/Lyapunov指数Key words
power system/weak signal detection/chaotic system/Vanderpol oscillator/phase shift compensation/Lyapunov index分类
信息技术与安全科学引用本文复制引用
姜烁,徐艳春,刘宇龙,杜于飞..改进高阶Vanderpol振子在微弱信号检测中的应用[J].电讯技术,2017,57(6):678-684,7.基金项目
教育部留学回国人员科研启动基金(KJ2015QT007) （KJ2015QT007）
