Vol. 3, No. 3, 398-404, 2004

Frequency domain GPR signal forward and inverse modelling for identifying the subsurface dielectric properties
Sebastien Lambot, Idesbald van den Bosch and Evert C. Slob

Abstract
Research has focused on the development of a new integrated approach including ground penetrating radar (GPR) design, GPR signal forward modelling, and GPR signal inversion to estimate the dielectric permittivity and electric conductivity of the shallow subsurface. We propose to use an ultrawide band (UWB) stepped frequency continuous wave (SFCW) radar combined with an off-ground monostatic transverse electromagnetic (TEM) horn antenna. Forward modelling is based on linear system response functions for describing the antenna, and on the exact solution of MaxwellÂ’s equations for wave propagation in a horizontally multilayered medium representing the subsurface. Model inversion, formulated by the classical least-squares problem, is carried out iteratively using advanced global optimisation techniques. The proposed approach is validated under laboratory conditions on a homogeneous sand subject to different water contents. The frequency dependence of the electric conductivity is characterized and the effect of soil roughness is analysed. The approach offers great promise in bridging the gap between airborne/spaceborne measurements of surface soil moisture and ground truth measurements.

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History
Submitted: 12 June 2004
Revised: 07 October 2004
Accepted: 14 October 2004

Citation
Lambot S, I van den Bosch & E C Slob, 2004. Frequency domain GPR signal forward and inverse modelling for identifying the subsurface dielectric properties. EARSeL eProceedings, 3(3), 398-404

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EARSeL European Association of Remote Sensing Laboratories, Paris, France

   
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BIS Library and Information System, Carl von Ossietzky University of Oldenburg

 

ISSN 1729-3782