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A Complete FDTD Simulation of a Real GPR Antenna System Operating Above Lossy and Dispersive Grounds
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0001-9241-8030
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
2005 (English)In: Progress in Electromagnetic Research, ISSN 1559-8985, Vol. 50, 209-229 p.Article in journal (Refereed) Published
Abstract [en]

The finite difference time domain (FDTD) method is used to analyze a practical ground penetrating radar (GPR) antenna system operating above lossy and dispersive grounds. The antenna is of the resistor-loaded bow-tie type and the analysis is made for two known soil types, namely Puerto Rico and San Antonio clay loams. The soil is modeled by a two term Debye model with a static conductivity and it is matched to the mentioned soils by using curve fitting. The FDTD scheme is implemented by the auxiliary differential equation (ADE) method together with the uniaxial perfectly matched layer (UPML) absorbing boundary conditions (ABC). In order to model a real GPR environment, ground surface roughness and soil inhomogeneities are also included. The effect of soil properties on the GPR response and antenna input impedance is presented. Thus the ability to detect buried metal and plastic pipes is investigated.

Place, publisher, year, edition, pages
2005. Vol. 50, 209-229 p.
Keyword [en]
PENETRATING RADAR; MAXWELLS EQUATIONS; NUMERICAL-SOLUTION; MEDIA; SCATTERING; FREQUENCY
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6146DOI: 10.2528/PIER04061002ISI: 000239278400009Scopus ID: 2-s2.0-33847398780OAI: oai:DiVA.org:kth-6146DiVA: diva2:10774
Note

QC 20100818

Available from: 2006-09-21 Created: 2006-09-21 Last updated: 2012-10-02Bibliographically approved
In thesis
1. A comprehensive study of resistor-loaded planar dipole antennas for ground penetrating radar applications
Open this publication in new window or tab >>A comprehensive study of resistor-loaded planar dipole antennas for ground penetrating radar applications
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Ground penetrating radar (GPR) systems are increasingly being used for the detection and location of buried objects within the upper regions of the earth’s surface. The antenna is the most critical component of such a system. This thesis presents a comprehensive study of resistor-loaded planar dipole antennas for GPR applications using both theory and experiments. The theoretical analysis is performed using the finite difference time domain (FDTD) technique.

The analysis starts with the most popular planar dipole, the bow-tie. A parametric study is done to find out how the flare angle, length, and lumped resistors of the antenna should be selected to achieve broadband properties and good target detection with less clutter. The screening of the antenna and the position of transmitting and receiving antennas with respect to each other and ground surface are also studied. A number of other planar geometrical shapes are considered and compared with the bow-tie in order to find what geometrical shape gives the best performance. The FDTD simulations are carried out for both lossless and lossy, dispersive grounds. Also simulations are carried out including surface roughness and natural clutter like rocks and twigs to make the modeling more realistic.

Finally, a pair of resistor-loaded bow-tie antennas is constructed and both indoor and outdoor measurements are carried out to validate the simulation results.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. xii, 54 p.
Series
Trita-EE, ISSN 1653-5146 ; 2006:033
Keyword
Ground penetrating radar, buried object detection, dipole antennas, FDTD methods, broadband properties, baluns, simulation, optimal design, lossy media, dispersive media, clutter.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-4110 (URN)91-7178-426-8 (ISBN)
Public defence
2006-10-06, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20100923

Available from: 2006-09-21 Created: 2006-09-21 Last updated: 2012-10-02Bibliographically approved

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Publisher's full textScopushttp://ceta.mit.edu/pier/pier50/09.0406102.Uduwawala.NFG.pdf

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Norgren, Martin

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