ELF Wave Propagation Along Sea-Rock Boundary and mCSEM Method

Pan, Weiyan; Li, Kai

doi:10.1007/978-3-642-39050-0_6

Cited by 5 publications

(4 citation statements)

References 25 publications

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“…To ascertain the validity of the method presented in this paper, we simplified the approximate expression provided by Pan [22] and the exact expression from Margetis [17] using MacClaurin's progressive formula. Subsequently, we compared the calculated results of these simplified expressions with those derived from the method proposed in this paper.…”

Section: Verification and Analysismentioning

confidence: 99%

“…Margetis [17] and Banos [18] significantly advanced the theory of dipole sources embedded in conductive half-spaces, obtaining approximate solutions for different distances from the source. Numerous other scholars have also made substantial contributions to the analysis of EMF in layered conductive media [19][20][21][22]. Among them, the description and explanation of the physical process of EMW propagation across the sea-air interface is a topic of interest.…”

Section: Introductionmentioning

confidence: 99%

“…Building upon this, we simplify the approximate numerical results of the Bessel-Fourier infinite integral term in the Sommerfeld integral expressions, leading to derived approximate integral expressions for EMF propagation in the near-region of seawater. To ascertain the validity of our proposed method, we compare its calculation results with those of Margetis [17] and Pan [22]. Furthermore, through simulation, we calculate and analyze the EMF propagation characteristics at the sea-air interface across different frequencies, dipole source heights, and observation point heights.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Electromagnetic Fields of Extremely Low-Frequency Horizontal Electric Dipoles at Sea–Air Boundaries

Hu,

Xie,

2023

Electronics

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The technologies of undersea detection and communication, seabed sensor networks, and geophysical detection using electromagnetic waves have emerged as research focal points within the field of marine science and engineering. However, most studies have focused on the propagation of electromagnetic fields over long distances within the shallow “sea-seabed” environment. This paper introduces a quasi-static approximation method to address the Sommerfeld numerical integration challenge within the near-field region, employing the horizontal electric dipole (HED) as a model. It derives the Sommerfeld numerical integral expressions under conditions where the wave-number ratio at the “seawater-air” boundary does not adhere to the requirement of |k0/k1| << 1 (where subscripts 0 and 1 denote seawater and air media, respectively). Building upon this, the paper simplifies the Bessel-Fourier infinite integral term within the integral expression to obtain Sommerfeld numerical integral approximations for the propagation of electromagnetic fields in the near region of extremely low frequency (ELF) within seawater. The study further conducts simulations and calculations to determine amplitude variations in electromagnetic field intensity generated by an ELF HED at different frequencies, dipole heights, and observation point depths. It concludes with an analysis of electromagnetic field propagation characteristics at the seawater-air boundary. Experimental findings highlight the lateral wave as the primary mode of electromagnetic wave propagation at this interface.

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Section: Verification and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of Electromagnetic Fields of Extremely Low-Frequency Horizontal Electric Dipoles at Sea–Air Boundaries

Hu,

Xie,

2023

Electronics

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“…It is known that the electromagnetic fields radiated by a vertical or horizontal electric dipole in stratified media are interesting and practically important in many cases [1][2][3]. In the past decades, this problem has led to many published papers and available achievements on analytical solutions [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], especially the three-layered or four-layered cases.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Trapped Surface Wave of a Vertical Electric Dipole Based on Undetermined Coefficient Method in the Presence of N-Layered Region: A Graphical Approach

Xu¹,

Zhu³

et al. 2019

International Journal of Antennas and Propagation

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In previous studies, the trapped surface wave, which is defined by the residue sums, has been addressed in the evaluation of the Sommerfeld integrals describing electromagnetic field of a vertical dipole in the presence of three-layered or four-layered region. But unfortunately, the existing computational scheme cannot provide analytical solution of the field in the presence of the N-layered region when N > 4. The scope of this paper is to overcome the limitations in root finding algorithm implied by the previous approach and provide solution of poles in stratified media. A set of pole equations following with explicit expressions are derived based on the undetermined coefficient method, which enable a graphical approach to obtain initial values of real roots. Accordingly, the generated trapped surface wave components are computed when both the observation point and the electric dipole source are on or near the surface of a dielectric-coated conductor. Validity, efficiency, and accuracy of the proposed method are illustrated by numerical examples.

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Approximated Solutions for ELF Near-Field Propagation Due to a Horizontal Electric Dipole Excitation Near the Sea-Rock Boundary

2018

IEEE Trans. Antennas Propagat.

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ELF Wave Propagation Along Sea-Rock Boundary and mCSEM Method

Cited by 5 publications

References 25 publications

Evaluation of Electromagnetic Fields of Extremely Low-Frequency Horizontal Electric Dipoles at Sea–Air Boundaries

Evaluation of Electromagnetic Fields of Extremely Low-Frequency Horizontal Electric Dipoles at Sea–Air Boundaries

Evaluation of the Trapped Surface Wave of a Vertical Electric Dipole Based on Undetermined Coefficient Method in the Presence of N-Layered Region: A Graphical Approach

Approximated Solutions for ELF Near-Field Propagation Due to a Horizontal Electric Dipole Excitation Near the Sea-Rock Boundary

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