Frequency responses of ground-penetrating radars operating over highly lossy grounds
Date
2002Source Title
IEEE Transactions on Geoscience and Remote Sensing
Print ISSN
0196-2892
Publisher
IEEE
Volume
40
Issue
6
Pages
1385 - 1394
Language
English
Type
ArticleItem Usage Stats
209
views
views
233
downloads
downloads
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.
Keywords
Finite-difference time-domain (FDTD) methodGround 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
Permalink
http://hdl.handle.net/11693/24701Published Version (Please cite this version)
http://dx.doi.org/10.1109/TGRS.2002.800437Collections
Related items
Showing items related by title, author, creator and subject.
-
Simulations of ground-penetrating radars over lossy and heterogeneous grounds
Gürel, Levent; Oğuz, U. (IEEE, 2001)The versatility of the three-dimensional (3-D) finite-difference time-domain (FDTD) method to model arbitrarily inhomogeneous geometries is exploited to simulate realistic groundpenetrating radar (GPR) scenarios for the ... -
A condition for the uniqueness of Gibbs states in one-dimensional models
Kerimov, A. (Elsevier BV * North-Holland, 1998)Uniqueness of limit Gibbs states of one dimensional models with a unique "stable" ground state is established at low temperatures. © 1998 Elsevier Science B.V. All rights reserved. -
Modeling of ground-penetrating-radar antennas with shields and simulated absorbers
Oğuz, U.; Gürel, Levent (IEEE, 2001)A three-dimensional (3-D) finite-difference time domain (FDTD) scheme is employed to simulate ground-penetrating radars. Conducting shield walls and absorbers are used to reduce the direct coupling to the receiver. Perfectly ...