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For the frequency domain electromagnetic method of grounding source form, our country’s electromagnetic workers have actively promoted the electromagnetic frequency sounding method of the former Soviet Union, using single-component apparent resistivity definition and full-field observation, pushing the observation area of the frequency domain artificial source electromagnetic method from the far zone to the middle zone. At the same time, Professor He Jishan of Central South University proposed the wide-area electromagnetic method (Jishan, Wide area electromagnetic method and pseudo random signal electric method. Higher Education Press, Beijing, 2010), defined the wide-area apparent resistivity, used the sequence pseudo-random signal technology, expanded the observation range of the artificial source electromagnetic method, improved the observation speed, accuracy and field efficiency, and formed a new electrical exploration method with unique characteristics (Jishan, Wide area electromagnetic method and pseudo random signal electric method. Higher Education Press, Beijing, 2010). For deep target detection, the grounded wire source transient electromagnetic method can obtain a larger detection depth in near-field observation, compared with CSAMT and LOTEM, it has higher detection accuracy, this research is of great significance.

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Introduction

  • 章节

  • 发表日期：

    2025年

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  • Guoqiang Xue,
  • Xin Wu,
  • Weiying Chen,
  • Nannan Zhou

摘要

For the frequency domain electromagnetic method of grounding source form, our country’s electromagnetic workers have actively promoted the electromagnetic frequency sounding method of the former Soviet Union, using single-component apparent resistivity definition and full-field observation, pushing the observation area of the frequency domain artificial source electromagnetic method from the far zone to the middle zone. At the same time, Professor He Jishan of Central South University proposed the wide-area electromagnetic method (Jishan, Wide area electromagnetic method and pseudo random signal electric method. Higher Education Press, Beijing, 2010), defined the wide-area apparent resistivity, used the sequence pseudo-random signal technology, expanded the observation range of the artificial source electromagnetic method, improved the observation speed, accuracy and field efficiency, and formed a new electrical exploration method with unique characteristics (Jishan, Wide area electromagnetic method and pseudo random signal electric method. Higher Education Press, Beijing, 2010). For deep target detection, the grounded wire source transient electromagnetic method can obtain a larger detection depth in near-field observation, compared with CSAMT and LOTEM, it has higher detection accuracy, this research is of great significance.