航空电磁时间域数据工频干扰研究与去除  

Study and removal of power frequency interference in time-domain airborne electromagnetic data

作　　者：黄威 肖都 贲放[1,2,3] 李军峰 李飞 胥值礼[1,2,3] HUANG Wei;XIAO Du;BEN Fang;LI Jun-Feng;LI Fei;XU Zhi-Li(Key Laboratory of Geophysical Electromagnetic Probing Technologies of Ministry of Natural Resources,Langfang065000,China;Institute of Geo-physical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China;State Research Center of Modern Geological Exploration Engineering Technology,Langfang065000,China)

机构地区：[1]自然资源部地球物理电磁法探测技术重点实验室,河北廊坊065000 [2]中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000 [3]国家现代地质勘查工程技术研究中心,河北廊坊065000

出　　处：《物探与化探》2023年第5期1281-1287,共7页Geophysical and Geochemical Exploration

基　　金：国家自然科学基金(42204147);基本科研业务费专项经费(AS2022J01);中国地质调查局项目(DD20230245)。

摘　　要：时间域航空电磁系统在飞行作业过程中,信号受人文噪声中的高压输电线影响,导致测得的响应中含有工频干扰信息而不能真实地反映地下介质分布情况,因此本文开展了工频干扰噪声去除研究,提出一种可直接在时间域中对数据进行处理的梳状滤波器,该滤波器的提出不仅节省了时—频和频—时转换的时间,也避免了繁琐的转换步骤,降低了转换过程中可能出现误差的风险。利用梳状滤波器的关键点是通过理想阻带来抑制工频频率信号及其k次谐波,达到对工频干扰压制的目的。本文不仅研究了IIR型和FIR型梳状滤波器,同时对比了单一陷波滤波器对工频干扰的去除效果,期望通过该研究可以为时间域航空电磁数据处理提供一种高效的工频干扰去除手段。During the flight exploration of the time-domain airborne electromagnetic system,signals are influenced by the artificial noise from high-voltage transmission lines.Consequently,the responses acquired contain power frequency interference information and thus fail to truly reflect the distribution of subsurface media.Hence,this study conducted research on the removal of power frequency inter-ference.This study proposed a comb filter that can directly process data in the time domain,shortening the time of time-frequency and frequency-time transform,avoiding the cumbersome transform steps,and reducing the risk of possible transform errors.The key to uti-lizing the comb filter is to suppress the power frequency signal and its kth harmonic by means of an ideal stopband for the suppression of power frequency interference.This study developed IIR and FIR comb filters and compared their removal effects on power frequency in-terference with that of a single notch filter.This study aims to offer a power frequency interference removal method for the processing of time-domain airborne electromagnetic data.

关 键 词：时间域航空电磁法 梳状滤波器 工频干扰 

分 类 号：P631[天文地球—地质矿产勘探]