Frequency responses of ground-penetrating radars operating over highly lossy grounds

Date
2002
Advisor
Instructor
Source Title
IEEE Transactions on Geoscience and Remote Sensing
Print ISSN
0196-2892
Electronic ISSN
Publisher
IEEE
Volume
40
Issue
6
Pages
1385 - 1394
Language
English
Type
Article
Journal Title
Journal ISSN
Volume Title
Abstract

The finite-difference time-domain (FDTD) method is used to investigate the effects of highly lossy grounds and the frequency-band selection on ground-penetrating-radar (GPR) signals. The ground is modeled as a heterogeneous half space with arbitrary background permittivity and conductivity. The heterogeneities encompass both embedded scatterers and surface holes, which model the surface roughness. The decay of the waves in relation to the conductivity of the ground is demonstrated. The detectability of the buried targets is investigated with respect to the operating frequency of the GPR, the background conductivity of the ground, the density of the conducting inhomogeneities in the ground, and the surface roughness. The GPR is modeled as transmitting and receiving antennas isolated by conducting shields, whose inner walls are coated with absorbers simulated by perfectly matched layers (PML). The feed of the transmitter is modeled by a single-cell dipole with constant current density in its volume. The time variation of the current density is selected as a smooth pulse with arbitrary center frequency, which is referred to as the operating frequency of the GPR.

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Other identifiers
Book Title
Keywords
Finite-difference time-domain (FDTD) method, Ground conductivity, Ground-penetrating radar (GPR), Perfectly matched layer (PML), Computer simulation, Current density, Electric conductivity, Finite difference method, Frequency response, Mathematical models, Natural frequencies, Permittivity, Receiving antennas, Surface roughness, Time domain analysis, Transmitters, Absorbing boundary conditions, Buried targets, Embedded scatterers, Frequency band selection, Heterogeneous half space, Lossy grounds, Perfectly matched layer, Single cell dipole, Surface holes, Ground penetrating radar systems
Citation
Published Version (Please cite this version)