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| Study and removal of power frequency interference in time-domain airborne electromagnetic data |
HUANG Wei1,2,3( ), XIAO Du1,2,3(), BEN Fang1,2,3, LI Jun-Feng1,2,3, LI Fei1,2,3, XU Zhi-Li1,2,3 |
1. Key Laboratory of Geophysical Electromagnetic Probing Technologies of Ministry of Natural Resources, Langfang 065000, China
2. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China
3. State Research Center of Modern Geological Exploration Engineering Technology, Langfang 065000, China |
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Abstract 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 interference. 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 utilizing 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 interference 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.
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Received: 21 September 2022
Published: 27 October 2023
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Corresponding Authors:
XIAO Du
E-mail: huangwei2012511@163.com;xdu@mail.cgs.gov.cn
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Power frequency interference noise patterns
a—signal characteristics without power frequency interference;b—power frequency interference noise characteristics
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The characteristic curves of notch filter at 50 Hz
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The characteristic curves of FIR and IIR comb filters
a—the amplitude-frequency characteristics of FIR comb filter;b—the amplitude-frequency characteristics of IIR comb filter
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The signal flow diagram of IIR comb filter
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The comparison of the effect of notch filter removing power-line interference
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The amplitude-frequency characteristics of notch filters
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The comparison of effects for FIR and IIR comb filter
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The amplitude-frequency characteristics of comb filter (IIR and FIR)
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The comparison of inversion before and after removing power frequency interference
a—power frequency interference is not removed;b—power frequency interference has been removed
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| [1] |
席继楼, 赵继骝, 关歆莹, 等. 地电场观测中的工频干扰抑制方法研究[J]. 地震, 2015, 4(35):53-63.
|
| [1] |
Xi J L, Zhao J J, Guan X Y, et al. Methods for restraining power frequency interferences in geo-electric field observation[J]. Earthquake, 2015, 4(35):53-63.
|
| [2] |
殷长春. 航空电磁理论与勘查技术[M]. 北京: 科学出版社. 2018.
|
| [2] |
Yin C C. Airborne electromagnetic theory and exploration technology[M]. Beijing: Science Press. 2018.
|
| [3] |
何伶俐, 王宇峰, 祝元仲, 等. 心电信号工频干扰数字滤波方法比较研究[J]. 电子设计工程, 2016, 24(13):70-72.
|
| [3] |
He L L, Wang Y F, Zhu Y Z, et al. Digital filtering technique for eliminating power-line interference from the ECG[J]. Electronic Design Engineering, 2016, 24(13):70-72.
|
| [4] |
李伟光, 张晓涛. 基于奇异向量频谱的工频干扰消除方法[J]. 华南理工大学学报:自然科学版, 2017, 45(5):16-23.
|
| [4] |
Li W G, Zhang X T. Removal method of power interference based on singular vector spectrum[J]. Journal of South China University of Technology:Natural Science Eolition, 2017, 45(5):16-23.
|
| [5] |
王保利. 工频干扰信号的时频域压制方法研究[J]. 中国煤炭地质, 2015, 4(27):73-77.
|
| [5] |
Wang B L. Power-line interference suppression within time-frequency domain[J]. Coal Geology of China, 2015, 4(27):73-77.
|
| [6] |
Huang C C, Liang S F, Young M S, et al. A novel application of S-transform in removing powerline interference from biomedical signals[J]. Physiological Measurement, 2009, 30:13-27.
|
| [7] |
Henley D C. Spectral clipping:A ProMAX module for attenuating strong monochromatic noise[R]. CREWES Research Report, 2001.
|
| [8] |
高少武, 赵波, 祝树云, 等. 自相关单频干扰识别与消除方法[J]. 地球物理学报, 2011, 54(3):854-861.
|
| [8] |
Gao S W, Zhao B, Zhu S Y, et al. Identification and elimination of monofrequency interference in seismic data by an autocorrelation algorithm[J]. Chinese Journal of Geophysics, 2011, 54(3):854-861.
|
| [9] |
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(9):2150-2163.
|
| [10] |
许滔滔, 王中兴, 肖卓伟, 等. 基于LSTM循环神经网络的大地电磁工频干扰压制[J]. 地球物理学进展, 2020, 35(5):2016-2022.
|
| [10] |
Xu T T, Wang Z X, Xiao Z W, et al. Magnetotelluric power frequency interference suppression based on LSTM recurrent neural network[J]. Progress in Geophysics, 2020, 35(5):2016-2022.
|
| [11] |
李实, 宋建平, 李创社. 瞬变电磁仪中几种干扰的消除方法[J]. 西南交通大学学报, 2001, 35(4):373-376.
|
| [11] |
Li S, Song J P, Li C S. Methods for reducing noise interference in transient electromagnetic method[J]. Journal of Xi’an Jiaotong University, 2001, 35(4):373-376.
|
| [12] |
张必明, 戴世坤, 蒋奇云, 等. 时频电磁法勘探数据时域去噪方法技术研究[J]. 应用地球物理, 2019, 16(3):382-398.
|
| [12] |
Zhang B M, Dai S K, Jiang Q Y, et al. Time-domain denoising of time-frequency electromagnetic data[J]. Applied Geophysics, 2019, 16(3):382-398.
|
| [13] |
昌彦君, 韩永琦, 江浩. 瞬变电磁法中消除工频噪声的自适应滤波器研究[J]. 工程地球物理学报, 2004, 1(5):407-411.
|
| [13] |
Chang Y J, Han Y Q, Jiang H. An adaptive filter to eliminate industrial electromagnetic noise in the transient electromagnetic method[J]. Chinese Journal of Engineering Geophysics, 2004, 1(5):407-411.
|
| [14] |
黄威, 贲放, 吴珊, 等. 正交多项式法在航空电磁运动噪声去除中的应用[J]. 物探与化探, 2019, 43(4):892-898.
|
| [14] |
Huang W, Ben F, Wu S, et al. The application of orthogonal polynomial fitting method to airborne electromagnetic motion noise removal[J]. Geophysical and Geochemical Exploration, 2019, 43 (4):892-898.
|
| [15] |
Smith S W. Data signal processing:A practical guide for engineers and scientists[M]. London:Newnes, 2003.
|
| [16] |
黄威, 贲放, 李军峰, 等. 航空瞬变电磁数据背景场去除研究[J]. 物探与化探, 2020, 44(3):672-676.
|
| [16] |
Huang W, Ben F, Li J F, et al. Background field removal from airborne transient electromagnetic data[J]. Geophysical and Geochemical Exploration, 44(3):672-676.
|
| [17] |
贲放, 黄威, 路宁, 等. 时间域航空电磁天电去除研究[J]. 物探与化探, 2020, 441(1):388-393.
|
| [17] |
Ben F, Huang W, Lu N, et al. A study of sferic removal from time domain airborne electromagnetic data[J]. Geophysical and Geochemical Exploration, 2020, 441(1):388-393.
|
|
|
|
