用于获取和处理 CSAMT 数据的电力线噪声抑制方案

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Meng Wang , Junlu Wang , Jianhua Li , Yuanman Zheng , Pinrong Lin
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引用次数: 0

摘要

受控声源音频电磁(CSAMT)的记录总是受到电力线噪声的污染,这严重阻碍了 CSAMT 在人口稠密地区的应用。本文以整数周期消除法为基础,介绍了一种用于 CSAMT 数据采集和处理的电力线噪声抑制方案。该方案的精髓在于选择合理的发射频率和频谱估计窗口长度。根据指定的电力传输标准,可以设计出一套 CSAMT 发射-接收频率和采样长度。通过将预先滤波的声波划分为指定的频谱估算和稳健叠加段,可以估算出有效振幅和相位。不涉及对噪声更敏感的磁场,直接将电场分量转换为全场视电阻率,从而获得地电特征。合成和现场实例表明,非标准电力线噪声可以得到有效抑制。这种方案可以很容易地嵌入到大多数现代仪器中,并将应用条件扩展到高文化噪声地区。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A powerline noise suppression scheme for the acquisition and processing of CSAMT data
The recordings of controlled source audio electromagnetic (CSAMT) are invariably contaminated with powerline noise, which seriously impedes the application of CSAMT in densely populated areas. Based on the integer-period cancellation, a powerline noise suppression scheme is described for CSAMT data acquisition and processing. The essence of this scheme is to choose reasonable transmitting frequencies and window lengths of spectrum estimation. According to the specified power transmission standard, a set of CSAMT transmitting-receiving frequencies and sampling lengths can be designed. The effective amplitude and phase can be estimated through dividing the pre-filtered soundings into specified segments for spectrum estimation and Robust stacking. Without involving the magnetic field that is more sensitive to noise, the electric field component is directly converted into the full-field apparent resistivity directly to obtain geoelectric feature. Synthetic and field examples indicate that the nonstandard powerline noise can be effectively suppressed. This scheme can be easily embedded in most of the modern instrumentations, and extend application conditions to high cultural noise areas.
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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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