Diffusion électromagnétique par un sol : Prise en compte d'un fil enfoui par l'introduction d'une impédance effective dans un code FDTD

Abstract : This thesis studies the electromagnetic wave scattering from a slightly rough soil in the presence of a buried wire. The problem is assumed to be two-dimensional (2D) (the rough surface depends only on one space variable) and the media separating the boundaries are assumed to be homogeneous. Firstly, a sensor was built up to measure the profiles of the rough soil in order to determine its statistical characteristics, such as the standard deviation of the heights and the correlation length. These parameters allow us to choose the adequate asymptotic electromagnetic scattering model devoted to our application: The Small Perturbation Method (SPM), valid for surface heights much smaller than the Radar wavelength. Then, from the SPM, the surface currents are expressed analytically, according to the order of expansion of the method and to the nature of the incident wave. The specific case of a plane incident wave is studied. In addition, the numerical results are compared to those obtained by a rigorous numerical method: the Method of Moments. Finally, the analytical expressions of the scattered field, obtained by SPM, allow us to derive the coherent reflection coefficient and the associated effective surface impedance. The purpose is to implement this impedance into a 3D FDTD simulation platform, in which the buried wire is taken into account.
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Theses
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https://hal.archives-ouvertes.fr/tel-01277827
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Submitted on : Tuesday, February 23, 2016 - 11:39:43 AM
Last modification on : Friday, November 16, 2018 - 1:29:18 AM
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  • HAL Id : tel-01277827, version 1

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Clément Chanel. Diffusion électromagnétique par un sol : Prise en compte d'un fil enfoui par l'introduction d'une impédance effective dans un code FDTD . Electromagnétisme. UNIVERSITE DE NANTES, 2015. Français. ⟨tel-01277827⟩

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