浅地表电磁探测中的匹配滤波技术应用  

Application of Matched Filtering Technology in Shallow Surface Electromagnetic Detection

作　　者：周逢道[1,2] 王绪磊 ZHOU Fengdao;WANG Xulei(College of Instrumentation&Electrical Engineering,Jilin University,Changchun 130061,China;National Geophysical Exploration Equipment Engineering Research Center,Jilin University,Changchun 130061,China)

机构地区：[1]吉林大学仪器科学与电气工程学院,长春130061 [2]吉林大学国家地球物理探测仪器工程技术研究中心,长春130061

出　　处：《实验室研究与探索》2020年第8期48-51,共4页Research and Exploration In Laboratory

基　　金：总装备部预先研究项目(ZLY20150404);吉林省科技发展计划重点项目(20100349)。

摘　　要：通过发射线圈发射一次场,计算空间中磁场的分布情况进而获得金属目标激发二次场的强弱。结合实际工作状态下天线经过金属目标物正上方时所得信号的波形特点,提出了一种具有高匹配度的滤波函数模型。使用该滤波函数提出了一种快速高效的匹配滤波方法,经过累加、平均、插值等计算,对采集的二次场特征值进行处理,分析其能量分布,最终完成目标物的识别和定位。经现场实验验证,所使用的滤波方法可以快速处理大量数据,实现对目标物的判别和精确定位,符合浅地表电磁探测实际工程的要求。This paper introduces a digital filtering method and is applied to shallow surface electromagnetic detection.The electromagnetic field is emitted by the transmitting coil,and the distribution of the magnetic field in the space is calculated to obtain the strength of the secondary electromagnetic field excited by the metal target. A filter function model with high matching degree is proposed,it combines the waveform characteristics of the signal obtained when the antenna passes directly above the metal target under actual working conditions. Finally,a fast and efficient matching filtering method is proposed by using the filter function. After accumulating, averaging, interpolation and other calculations,the collected secondary field eigenvalues are processed,the energy distribution is analyzed,and the target is identified and located. The field test proves that the filtering method used in this paper can quickly process a large amount of data,realize the discrimination and precise positioning of the target,and meet the requirements of the actual engineering of shallow surface electromagnetic detection.

关 键 词：电磁探测 匹配滤波 信噪比 目标识别 

分 类 号：TN713[电子电信—电路与系统]