闪电辐射源多脉冲匹配定位方法  

Multiple Pulses Matching Method for Lightning Radiation Sources

作　　者：王彦辉 闵应昌 刘亚栎 刘银萍[1,2] WANG Yan-hui;MIN Ying-chang;LIU Ya-li;LIU Yin-ping(Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China;College of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China;Laboratory of Plateau Atmospheric Physics, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China)

机构地区：[1]南京信息工程大学气象灾害预报预警与评估协同创新中心,南京210044 [2]南京信息工程大学大气物理学院,南京210044 [3]中国科学院西北生态环境资源研究院高原大气物理研究室,兰州730000

出　　处：《科学技术与工程》2021年第27期11490-11498,共9页Science Technology and Engineering

基　　金：国家重点研发计划(2017YFC150150);国家自然科学基金(41675006,91537209,41875002)。

摘　　要：为匹配出更多的闪电辐射源脉冲,定位出更多的闪电辐射源位置,得到清晰的闪电发展通道,提出了一种闪电辐射源多脉冲匹配定位方法。该方法利用经验模态分解(empirical mode decomposition,EMD)方法对原始的闪电电场信号进行分解,再将分解得到的部分分量合成,将合成后的信号进行归一化并提取脉冲,依据滑动窗口内四个脉冲序列的高度比例特征和间隔特征实现相同辐射源脉冲的匹配。结果表明,利用EMD方法对闪电电场信号进行分解再部分合成,去除了原始信号中的直流分量、单调分量和低频周期分量,使信号波形更干净平稳;依据四个脉冲序列的高度比例特征和间隔特征对各测站间相同闪电辐射源的脉冲进行匹配,基于辐射源脉冲的到达时间差定位出辐射源的三维位置,可以清晰地描绘出闪电通道的发展过程。从整体定位效果来看,本文提出的闪电辐射源多脉冲匹配定位方法效果优于传统的单脉冲匹配方法。In order to match more lightning pulses of same radiation sources,locate more lightning radiation sources positions and get clear lightning channels,a lightning radiation multiple pulses matching and locating method was proposed.Empirical mode decomposition(EMD)was used to decompose the original signal of lightning electric field,and then some decomposed parts was synthesized.The synthesized signal was normalized and the pulses was extracted.According to the height proportion characteristics and interval cha-racteristics of the four pulses sequences in a sliding window,the matching of the same radiation pulses was realized.The results show that the EMD method is used to decompose and synthesize the signal of lightning electric field,and the direct current component,monotone component and low-frequency periodic component in the original signal are removed,so that the signal waveform is more clean and stable.According to the height proportion characteristics and interval characteristics of the four pulses sequence,the pulses of same lightning radiation sources among the stations is matched,and the time difference of arrival of the radiation pulses is determined.The three-dimensional locating of the radiation sources can clearly depict the development process of lightning channels.From the overall locating effect,the multiple pulses matching method proposed is better than the traditional single pulse matching method.

关 键 词：雷电探测 三维定位 闪电辐射源 经验模态分解 脉冲匹配 

分 类 号：P427.3[天文地球—大气科学及气象学]