基于傅里叶变换的雷电磁频谱研究  

Research on lightning magnetic spectrum based on Fourier transform

作　　者：孙军民 SUN Junmin(School of New Energy,Longdong University,Qingyang 745000,China)

机构地区：[1]陇东学院新能源学院,甘肃庆阳745000

出　　处：《现代电子技术》2024年第24期13-17,共5页Modern Electronics Technique

基　　金：甘肃省青年科技基金项目(20JR10RA135);庆阳自然科学基金项目(QY2021A-F014);陇东学院博士基金项目(XYBYZK2407);陇东学院青年科技创新项目(XYZK2204);甘肃省自然科学基金项目(23JRRM0755)。

摘　　要：为了研究直击雷和感应雷的电磁频谱特性,采用Matlab仿真软件绘制出标准雷电流波形图,再通过快速傅里叶变换分析标准的雷电流波形的频谱特性,并提取出雷电流波形在相应频域的有害频率范围,最后从频谱图中提取雷电流的基波和高次谐波,取前5次谐波的幅值与相位还原谐波的函数表达式。通过分析有害谐波存在的频率范围和过滤有害谐波的科学方法,为雷电磁脉冲辐射防护措施的制定提供了参考依据。In order to study the magnetic spectrum characteristics of direct lightning and inductive lightning,the standard lightning current waveform is drawn by means of Matlab simulation software.The spectral characteristics of the standard lightning current waveform is analyzed by means of fast Fourier transform,and the harmful frequency range of the lightning current waveform in the corresponding frequency domain is extracted.The fundamental wave and high-order harmonics of the lightning current are extracted from the spectrum,and the amplitude and phase of the first 5 times harmonics are extracted to restore the function expression of the harmonics.The frequency range of harmful harmonics is analyzed and the scientific methods are used to filter them,which can provide a reference for the development of lightning magnetic pulse radiation protection measures.

关 键 词：雷电磁频谱 快速傅里叶变换 直击雷 感应雷 雷电流波形 谐波提取 

分 类 号：TN712.1-34[电子电信—电路与系统] O441.4[理学—电磁学]