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

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buir.contributor.authorGürel, Levent
dc.citation.epage1394en_US
dc.citation.issueNumber6en_US
dc.citation.spage1385en_US
dc.citation.volumeNumber40en_US
dc.contributor.authorOğuz, U.en_US
dc.contributor.authorGürel, Leventen_US
dc.date.accessioned2016-02-08T10:33:07Z
dc.date.available2016-02-08T10:33:07Z
dc.date.issued2002en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.description.abstractThe 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.en_US
dc.description.provenanceMade available in DSpace on 2016-02-08T10:33:07Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 70227 bytes, checksum: 26e812c6f5156f83f0e77b261a471b5a (MD5) Previous issue date: 2002en
dc.identifier.doi10.1109/TGRS.2002.800437en_US
dc.identifier.issn0196-2892
dc.identifier.urihttp://hdl.handle.net/11693/24701
dc.language.isoEnglishen_US
dc.publisherIEEEen_US
dc.relation.isversionofhttp://dx.doi.org/10.1109/TGRS.2002.800437en_US
dc.source.titleIEEE Transactions on Geoscience and Remote Sensingen_US
dc.subjectFinite-difference time-domain (FDTD) methoden_US
dc.subjectGround conductivityen_US
dc.subjectGround-penetrating radar (GPR)en_US
dc.subjectPerfectly matched layer (PML)en_US
dc.subjectComputer simulationen_US
dc.subjectCurrent densityen_US
dc.subjectElectric conductivityen_US
dc.subjectFinite difference methoden_US
dc.subjectFrequency responseen_US
dc.subjectMathematical modelsen_US
dc.subjectNatural frequenciesen_US
dc.subjectPermittivityen_US
dc.subjectReceiving antennasen_US
dc.subjectSurface roughnessen_US
dc.subjectTime domain analysisen_US
dc.subjectTransmittersen_US
dc.subjectAbsorbing boundary conditionsen_US
dc.subjectBuried targetsen_US
dc.subjectEmbedded scatterersen_US
dc.subjectFrequency band selectionen_US
dc.subjectHeterogeneous half spaceen_US
dc.subjectLossy groundsen_US
dc.subjectPerfectly matched layeren_US
dc.subjectSingle cell dipoleen_US
dc.subjectSurface holesen_US
dc.subjectGround penetrating radar systemsen_US
dc.titleFrequency responses of ground-penetrating radars operating over highly lossy groundsen_US
dc.typeArticleen_US

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