摘要
所研制的闪电声源定位系统由四元正方形麦克风声阵列、雷声信号传输系统和信号采集、记录与显示设备等部分组成.结合一次地闪雷声实测数据,采用广义互相关时延估计法计算了雷声信号到达不同麦克风的时间差,依据声光差定距法获得了声源点与麦克风阵列的距离,实现了雷电声源点的三维定位和闪电放电通道的三维重构.通过与同步观测到的雷电电磁脉冲场及大气电场进行对比,表明系统的定位效果较好.
The lightning sound source localization system consists of four-element square microphone arrays,thunder signal transmission system,signal acquisition,recording and display device.Combined with measured thunder data,this paper applies the generalized cross correlation(GCC)time delay estimation(TDE)method to calculate time differences between signals arriving at different microphones,obtains distance between the sound source and the microphone arrays on the basis of acousto-optic difference method,and realizes three-dimensional positioning of the sound source and reconstruction of the lightning discharging channel.Compared with synchronous observed electromagnetic pulse(LEMP)fields and atmospheric electric field,it proves good positioning performance of the system.
出处
《电波科学学报》
EI
CSCD
北大核心
2014年第2期270-275,共6页
Chinese Journal of Radio Science
基金
国家自然科学基金资助项目(No.61271106)
关键词
雷电
闪电声源定位
麦克风阵列
时延估计
闪电放电通道
lightning
lightning sound source localization
microphone arrays
time delay estimation
lightning discharging channel