EARSeL eProceedings Vol. 3, No. 3, 398-404, 2004
Sebastien Lambot, Idesbald van den Bosch and Evert C. Slob
Abstract
Citation EARSeL European Association of Remote Sensing Laboratories, Paris, France BIS-Verlag
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 Maxwell'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
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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