Skip to Main content Skip to Navigation
Journal articles

Modélisation 3D de la propagation des ondes radar en milieu hétérogène atténuant et dispersif par la méthode des différences finies dans le domaine temporel

Abstract : Generalization of the use of geophysical radar (or GPR for “Ground Penetrating Radar”) in fields ranging from the surveying of civil engineering structures to hydrogeology necessitates, at present, better understanding of the phenomena inherent to the electromagnetic propagation taking place within heterogeneous and dispersive media: the numerical simulation of radar wave propagation lies within this scope of research. GPR modeling by means of the Finite Difference Time Domain (FDTD) method discussed in this article requires, in addition to classical propagation equations, the implementation of physical dispersion whose impact is critical for the impulse radar technique and absorbing boundary conditions to simulate an open medium. The objective therefore is to propose an original implementation, which ensures a thorough modeling approach for behavioral mode ls associated with given geological or geotechnical media. This article thereby presents an FDTD-based implementation procedure that includes absorbing boundary conditions at domain boundaries through use of the “perfect matched layer” (PML) method with decomposition of the fields over the entire discretization domain (Sullivan, 1996) as well as the ability to quickly integrate a medium behavioral model with physical dispersion via the ADE (Auxiliary Differential Equation) method. This implementation is the focus of at heoretical validation exercise and has been accompanied, for purposes of illustration, by a series of summary examples for representative attenuating media (pipes embedded in dispersive clays).
Document type :
Journal articles
Complete list of metadatas

https://hal-normandie-univ.archives-ouvertes.fr/hal-01740124
Contributor : Fayçal Rejiba <>
Submitted on : Wednesday, March 21, 2018 - 3:49:30 PM
Last modification on : Wednesday, October 14, 2020 - 3:52:21 AM

Identifiers

  • HAL Id : hal-01740124, version 1

Citation

Fayçal Rejiba, Christian Camerlynck. Modélisation 3D de la propagation des ondes radar en milieu hétérogène atténuant et dispersif par la méthode des différences finies dans le domaine temporel. bulletin des laboratoires des ponts et chaussées- 237-réf, 2002, pp.81-98/réf. 4401. ⟨hal-01740124⟩

Share

Metrics

Record views

111