Application of the TLM method to half-space and remote-sensing problems

Author

Simons, Neil R S ; Sebak, Abdel-Razik ; Bridges, Greg E.

Author_Institution

Dept. of Electr. & Comput. Eng., Manitoba Univ., Winnipeg, Man., Canada

Volume

33

Issue

3

fYear

1995

fDate

5/1/1995 12:00:00 AM

Firstpage

759

Lastpage

767

Abstract

The problem of scattering and radiation in the presence of a material half-space is solved using the transmission line matrix (TLM) method. The TLM method is a general numerical method for obtaining an approximate solution to the time-dependent form of Maxwell´s equations in the presence of complex environments. The method requires the discretization of the entire spatial domain of the problem and provides the transient response as well as (through discrete Fourier transform) the frequency domain response. The three-dimensional symmetric-condensed TLM node is applied. A total/scattered field formulation is applied to excite the space. The source used is an electrically short electric dipole and is described analytically in the time-domain. The method is used to calculate near field distributions (in both the time and frequency domain) and the change in source input impedance of a dipole radiator in the presence of a half-space. Numerical simulations relevant to the detection of buried objects are provided

Keywords

S-matrix theory; geophysical prospecting; geophysical techniques; inverse problems; remote sensing; terrestrial electricity; Maxwell´s equations; S-matrix theory; TLM method; approximate solution; buried object detection; dipole radiator; discretization; electrically short electric dipole; frequency domain response; general numerical method; geoelectric EM method; geophysical measurement technique; half-space a; inverse problem; remote sensing; remote-sensing problem; scattering; terrestrial electricity geology; three-dimensional symmetric-condensed TLM node; transient response; transmission line matrix; Buried object detection; Discrete Fourier transforms; Frequency domain analysis; Impedance; Maxwell equations; Remote sensing; Scattering; Time domain analysis; Transient response; Transmission line matrix methods;

fLanguage

English

Journal_Title

Geoscience and Remote Sensing, IEEE Transactions on

Publisher

ieee

ISSN

0196-2892

Type

jour

DOI

10.1109/36.387591

Filename

387591