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
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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。Abstract: 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.
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[1] 李肃义, 张熠, 张继昆, 等.海洋可控源电磁信号噪声压制综述[J].石油地球物理勘探, 2020, 55(6):1383-1394.
Li S Y, Zhang Y, Zhang J K, et al.A review of noise suppression methods for marine controlled source electromagnetic signals[J].Oil Geophysical Prospecting, 2020, 55(6):1383-1394.
[2] 葛双超, 李斌.大地电磁法人文噪声干扰特点及处理方法综述[J].物探化探计算技术, 2021, 43(5):609-619.
Ge S C, Li B.Review of the characteristics and processing methods of human noise interference in magnetotelluric[J].Computing Techniques for Geophysical and Geochemical Exploration, 2021, 43(5):609-619.
[3] Bianchi C, Meloni A.Natural and man-made terrestrial electromagnetic noise:An outlook[J].Annals of Geophysics, 2007, 50(3):435-445.
[4] Butler K E , Russell R D.Cancellation of multiple harmonic noise series in geophysical records[J].Geophysics, 2003, 68(3):1083-1090.
[5] Tang J T, Li G, Zhou C, et al.Power-line interference suppression of MT data based on frequency domain sparse decomposition[J].Journal of Central South University, 2018, 25:2150-2163.
[6] Larsen J J, Lévy L, Asif M R.Removal of powerline noise in geophysical datasets with a scientific machine-learning based approach[J].IEEE Transactions on Geoscience and Remote Sensing, 2022, 60:1-10.
[7] 徐志敏, 汤井田, 强建科.矿集区大地电磁强干扰类型分析[J].物探与化探, 2012, 36(2):214-219.
Xu Z M, Tang J T, Qiang J K.An analysis of the ma gnetotelluric strong interference types in ore concentration areas[J].Geophysical and Geochemical Exploration, 2012, 36(2):214-219.
[8] 李桐林, 刘福春, 韩英杰, 等.50万伏超高压输电线的电磁噪声的研究[J].长春科技大学学报, 2000, 30(1):80-83.
Li T L, Liu F C, Han Y J, et al.The study of electromagnetic noise created by high voltage transmission line[J].Journal of Changchun University of Science and Technology, 2000, 30(1):80-83.
[9] Pádua M B, Padilha A L, Vitorello .Disturbances on magnetotelluric data due to DC electrified railway:A case study from southeastern Brazil[J].Earth Planets & Space, 2002, 54(5):591-596.
[10] Villante U, Piancatelli A, Palangio P.On the man-made contamination on ULF measurements:Evidence for disturbances related to an electrified DC railway[J].Annales Geophysical, 2014, 32(9):1153-1161.
[11] 周聪, 汤井田, 原源, 等.强干扰区含噪电磁场的时空分布特征[J].吉林大学学报:地球科学版, 2020, 50(6):1870-1886.
Zhou C, Tang J T, Yuan Y, et al.Spatial and temporal distribution characteristics of electromagnetic fields in strong noise area[J].Journal of Jilin University:Earth Science Edition, 2020, 50(6):1870-1886.
[12] 何继善.广域电磁法和伪随机信号电法[M].北京:高等教育出版社, 2010.He J S.Wide-field electromagnetic method and pseudo-random signal electricity method[M].Beijing:Higher Education Press, 2010.
[13] 何继善.广域电磁测深法研究[J].中南大学学报:自然科学版, 2010, 41(3):1065-1072.
He J S.Research on wide field electromagnetic sounding method[J].Journal of Central South University:Natural Science Edition, 2010, 41(3):1065-1072.
[14] 汤井田, 任政勇, 周聪, 等.浅部频率域电磁勘探方法综述[J].地球物理学报, 2015, 58(8):2681-2705.
Tang J T, Ren Z Y, Zhou C et al.Frequency-domain electromagnetic methods for exploration of the shallow subsurface:A review[J].Chinese Journal of Geophysics, 2015, 58(8):2681-2705.
[15] 何继善.三元素集合中的自封闭加法与2n系列伪随机信号编码[J].中南大学学报:自然科学版, 2010, 41(2):632-637.
He J S.Closed addition in a three-element set and 2n sequence pseudo-random signal coding[J].Journal of Central South University:Science and Technology, 2010, 41(2):632-637.
[16] Yang Y, He J S, Li D Q.Energy distribution and effective components analysis of 2n sequence pseudo-random signal[J].Transactions of Nonferrous Metals Society of China, 2021, 31(7):2102-2115.
[17] Yang Y, He J S, Ling F, et al.Distributed wide field electromagnetic method based on high-order 2n sequence pseudo random signal[J].Transactions of Nonferrous Metals Society of China, 2022, 32(5):1609-1622.
[18] Zhou C, Yang Y, Zhang H, et.al.A novel envelope algorithm for estimating and evaluating noise effect in stationary controlled-source electromagnetic data[J].Journal of Applied Geophysics, 2022, 207:104864.
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