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000015382 0247_ $$2DOI$$a10.1109/TGRS.2010.2089691
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000015382 041__ $$aeng
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000015382 084__ $$2WoS$$aGeochemistry & Geophysics
000015382 084__ $$2WoS$$aEngineering, Electrical & Electronic
000015382 084__ $$2WoS$$aRemote Sensing
000015382 1001_ $$0P:(DE-Juel1)129476$$aJadoon, K.Z.$$b0$$uFZJ
000015382 245__ $$aAnalysis of Horn Antenna Transfer Functions and Phase-Center Position for Modeling Off-Ground GPR
000015382 260__ $$aNew York, NY$$bIEEE$$c2011
000015382 300__ $$a1649 - 1662
000015382 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article
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000015382 440_0 $$017961$$aIEEE Transactions on Geoscience and Remote Sensing$$v49$$x0196-2892$$y5
000015382 500__ $$3POF3_Assignment on 2016-02-29
000015382 500__ $$aThis work was supported by the Forschungszentrum Julich GmbH (Germany), the Universite Catholique de Louvain and Fonds de la Recherche Scientifique (Belgium), Delft University of Technology (The Netherlands), and DIGISOIL project financed by the European Commission under the Seventh Framework Program for Research and Technological Development, Area "Environment," Activity 6.3 "Environmental Technologies."
000015382 520__ $$aThe antenna of a zero-offset off-ground ground-penetrating radar can be accurately modeled using a linear system of frequency-dependent complex scalar transfer functions under the assumption that the electric field measured by the antenna locally tends to a plane wave. First, we analyze to which extent this hypothesis holds as a function of the antenna height above a multilayered medium. Second, we compare different methods to estimate the antenna phase center, namely, 1) extrapolation of peak-to-peak reflection values in the time domain and 2) frequency-domain full-waveform inversion assuming both frequency-independent and -dependent phase centers. For that purpose, we performed radar measurements at different heights above a perfect electrical conductor. Two different horn antennas operating, respectively, in the frequency ranges 0.2-2.0 and 0.8-2.6 GHz were used and compared. In the limits of the antenna geometry, we observed that antenna modeling results were not significantly affected by the position of the phase center. This implies that the transfer function model inherently accounts for the phase-center positions. The results also showed that the antenna transfer function model is valid only when the antenna is not too close to the reflector, namely, the threshold above which it holds corresponds to the antenna size. The effect of the frequency dependence of the phase-center position was further tested for a two-layered sandy soil subject to different water contents. The results showed that the proposed antenna model avoids the need for phase-center determination for proximal soil characterization.
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000015382 65320 $$2Author$$aAntenna modeling
000015382 65320 $$2Author$$aantenna phase center
000015382 65320 $$2Author$$afrequency dependence
000015382 65320 $$2Author$$aground-penetrating radar (GPR)
000015382 7001_ $$0P:(DE-Juel1)VDB54976$$aLambot, S.$$b1$$uFZJ
000015382 7001_ $$0P:(DE-HGF)0$$aSlob, E.C.$$b2
000015382 7001_ $$0P:(DE-Juel1)129549$$aVereecken, H.$$b3$$uFZJ
000015382 773__ $$0PERI:(DE-600)2027520-1$$a10.1109/TGRS.2010.2089691$$gVol. 49, p. 1649 - 1662$$p1649 - 1662$$q49<1649 - 1662$$tIEEE transactions on geoscience and remote sensing$$v49$$x0196-2892$$y2011
000015382 8567_ $$uhttp://dx.doi.org/10.1109/TGRS.2010.2089691
000015382 909CO $$ooai:juser.fz-juelich.de:15382$$pVDB$$pVDB:Earth_Environment
000015382 9131_ $$0G:(DE-Juel1)FUEK407$$bErde und Umwelt$$kP24$$lTerrestrische Umwelt$$vTerrestrische Umwelt$$x0
000015382 9132_ $$0G:(DE-HGF)POF3-259H$$1G:(DE-HGF)POF3-250$$2G:(DE-HGF)POF3-200$$aDE-HGF$$bMarine, Küsten- und Polare Systeme$$lTerrestrische Umwelt$$vAddenda$$x0
000015382 9141_ $$y2011
000015382 915__ $$0StatID:(DE-HGF)0010$$aJCR/ISI refereed
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