城市环境下的高阶伪随机电磁信号有效信息提取——以济南市某轨道交通工程区为例  

Effective information extraction from high-order pseudo-random electromagnetic signals in urban environments:A case study of a rail transit engineering area in Jinan City,China

作　　者：马振波 周长宇 阮进平 张文艳 MA Zhen-Bo;ZHOU Chang-Yu;RUAN Jin-Ping;ZHANG Wen-Yan(Henan Academy of Geology,Zhengzhou 450016,China;School of Science and Engineering,The Chinese University of Hong Kong,Shenzhen 518000,China;Institute of Geotechnical and Underground Engineering,Shandong University,Jinan 250000,China;Shandong Research Institute of Coal Geological Planning and Prospecting,Jinan 250000,China)

机构地区：[1]河南省地质研究院,河南郑州450016 [2]香港中文大学(深圳)理工学院,广东深圳518000 [3]山东大学岩土与地下工程研究院,山东济南250000 [4]山东省煤田地质规划勘察研究院,山东济南250000

出　　处：《物探与化探》2024年第6期1709-1719,共11页Geophysical and Geochemical Exploration

基　　金：河南省科技厅基础性科研项目“半航空频率域电磁响应特征分析与视电阻率成像算法研究”(2023-331-XM025-KT01)。

摘　　要：高阶伪随机电磁信号的频谱包含了勘探工程所需的全部频率,具有提升工作效率及抗干扰性能强的特点,在城市环境下的电磁勘探中得到应用。因此,本文在济南城市轨道交通8号线一期工程专项勘查区内,具有强烈工频干扰地区进行的电磁勘探工作中,应用了高阶伪随机电磁信号进行有效信息的提取。为了高效率地提取高质量的有效信息,作者采用包络评价算法与高阶伪随机电磁信号相结合的方案。通过频谱包络值来较为准确地估计信号实际受到干扰的情况,对接收信号进行筛选,进一步避开工频干扰及其谐波影响,获得了更多的有效频率和地电信息,为后续反演解释提供了丰富的有效电磁数据。该方法为今后复杂城市环境下的电磁勘探工作提供了一种地下有效信息的提取技术。The spectra of high-order pseudo-random electromagnetic signals encompass all the frequencies required for exploration engineering,it has the characteristics of enhancing work efficiency and strong anti-interference capability,and has been applied in electromagnetic exploration in urban environments.This study extracted effective information from high-order pseudo-random signals in the electromagnetic survey conducted in areas with strong powerline interference within the special exploration area of the Phase I engineering of the Jinan Urban Rail Transit Line 8.To efficiently extract high-quality effective information,an envelope assessment algorithm was combined with high-order pseudo-random signals.Specifically,the actual signal interference was accurately estimated by analyzing the spectral envelope values.This allows for screening received signals,thus further mitigating the impacts of powerline interference and its harmonics.As a result,more effective frequency and geoelectric information were obtained,providing abundant effective electromagnetic data for subsequent inversion and interpretation.The novel method serves as a technique for effective information extraction for future electromagnetic sounding in a complex urban environment.

关 键 词：电磁勘探 高阶伪随机信号 包络评价 城市环境 

分 类 号：P631[天文地球—地质矿产勘探]