On the importance of modeling antenna-material coupling for quantitative characterization using GPR

Lambot, Sébastien;Tran, Viet Anh;André, Frédéric
(2012) 18th European Meeting of Environmental and Engineering Geophysics of the Near Surface Geoscience Division of EAGE - Workshop “New Developments on GPR theory and applications” — Location: Paris (France) (3.September.2012)

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Abstract
Physically-based ground-penetrating radar (GPR) data processing is essential for quantitative characterization of soils and materials. A novel near-field GPR antenna model coupled with layered media Green's functions was used to investigate the effect of antenna-medium coupling in the analysis of GPR data. The radar antennas are modeled using an equivalent set of infinitesimal electric dipoles and characteristic, frequency-dependent, global reflection and transmission coefficients. These coefficients determine through a plane wave decomposition, wave propagation between the radar reference plane, point sources, and field points. We calibrated in laboratory conditions a 400 MHz centerfrequency time-domain antenna, from which synthetic GPR data sets were generated. We observed that, depending on the model configuration, antenna effects may affect the topography of the objective function in fullwaveform inverse problems. In addition, antenna-medium coupling has a significant impact on the medium surface reflection, whether in terms of amplitude or propagation time (which usually defines the so-called time zero). We also showed that an effective source cannot be used for simulating near-field radar data as the antenna-medium coupling strongly depends on the medium properties. Numerical and laboratory experiments demonstrated that the proposed modeling approach shows great promise for non-destructive testing of planar materials and soils, e.g., using ground-penetrating radar.
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Lambot, S., Tran, V. A., & André, F. (2012). On the importance of modeling antenna-material coupling for quantitative characterization using GPR. 18th European Meeting of Environmental and Engineering Geophysics of the Near Surface Geoscience Division of EAGE - Workshop “New Developments on GPR theory and applications”, Paris (France).