微弱瞬态电磁辐射信号的双耦合Duffing振子自适应检测方法  

Method for Detecting Weak Transient Electromagnetic Radiation Signal Based on Adaptive Double Coupled Duffing Oscillators

作　　者：张悦[1] 刘尚合[1] 胡小锋[1] 樊高辉[1] 

机构地区：[1]军械工程学院静电与电磁防护研究所,石家庄050003

出　　处：《高电压技术》2016年第6期2009-2016,共8页High Voltage Engineering

基　　金：国家自然科学基金(61172035)~~

摘　　要：以研究瞬态电磁辐射信号的远距离探测手段为目的,得到了适用于高频瞬态信号的改进双耦合Duffing振子自适应检测算法。首先分析了双耦合Duffing系统对瞬态放电信号的检测性能,发现该系统对高频信号的检测灵敏度较差,且背景噪声会影响系统的同步效果,导致目标信号误判。基于此对系统算法进行了改进,引入了信号变尺度处理和自适应调节驱动力幅值的算法,利用仿真以及实验验证了该系统的可行性。仿真及实验结果表明,在微弱窄带信号及高斯噪声的干扰下,检测算法能将信噪比<–20 d B的放电信号检测出来;且当信噪比>–20 d B时,系统的检测概率能>90%,检测信噪比<–20 d B时,系统的虚警概率控制为<1%,能够满足工程应用中对检测概率的需求。可见改进算法能够克服双耦合Duffing振子模型存在的弱点,通过待检信号展宽及自动调节驱动力幅值,得到最佳系统检测态,将淹没在背景噪声中的瞬态电磁辐射信号检测出来,为进一步远距离探测的工程应用提供了理论指导。To investigate the remote detection method of transient electromagnetic signals, the detection method based on adaptive double coupled Duffing oscillators is improved, which is applied to high frequency transient signals. At first, the detection performance of double coupled Duffing oscillators is analyzed. It is found that the system detection sensitivity is weak for high frequency signals and the background noises will disturb the synchronization which leads to mistake in estimating the target signal. Hence, the arithmetic is improved based on the scale transformation and adjusting amplitude of driving force adaptively. The simulation and experiment are conducted to verify the feasibility of the improved arithmetic. The results show that the discharge signal can be detected from the interference of weak narrow-band noise and Gaussian noise with the signal noise ratio（SNR） being –20 d B. When the SNR is greater than –20 d B, the detection probability can reach 90%. And when the SNR is less than –20 d B, the false alarm probability can be controlled within 1%. It is demonstrated that the shortages of double coupled Duffing oscillators can be overcome. By expending the target signal and adjusting amplitude of driving force, the transient electromagnetic signals can be detected from background noises. The research may provide guidance to further study the engineering application of remote detection.

关 键 词：瞬态电磁辐射 微弱信号 混沌 双耦合Duffing振子 自适应检测 变尺度 

分 类 号：TM83[电气工程—高电压与绝缘技术]