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Volume 46 Number 3
  • E-ISSN: 1365-2478

Abstract

An algorithm for modelling and migrating ground penetrating radar (GPR) data in moderately heterogeneous dispersive media is presented. The method is based on wavefield extrapolation in the frequency–wavenumber (–) domain, from the solution of the 2D Maxwell's equations. The wavefield is extrapolated by a phase‐shift technique using a constant relative permittivity and a quality factor . It is then modified by a correction term to handle the lateral and variations. The spatial distribution of the and ‐factor values, representing the given model parameters, is introduced into the algorithm by a regular grid parametrization. The radar wave dispersion and attenuation, induced by relaxation processes, are taken into account by a linear frequency‐dependent model, and expressed by a complex wavenumber in the propagation equation.

A synthetic case and a field data set illustrate the potential of the method for frequencies of 300, 500 and 900 MHz. In the first case, a typical civil engineering problem is considered. The frequency dependence of the wave velocity and attenuation is well illustrated. The synthetic data are afterwards migrated using the initial model parameters. The results show the importance of using spatially varying model parameters in the migration processes. The second case concerns an application of the method to a real data set. In order to adjust the model parameters, a forward modelling sequence is performed until the best match between the measured and the synthetic data is achieved. A depth migration is then applied to the data, and the result is compared with the initial model parameters.

In conclusion, we assess the contributions of the method to industrial applications, by discussing the performance of the algorithm compared with its limitations.

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2008-06-28
2024-04-28

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Frequency–wavenumber modelling and migration of 2D GPR data in moderately heterogeneous dispersive media[Link]
Geophysical Prospecting 46, 287 (0198); https://doi.org/10.1046/j.1365-2478.1998.00091.x
/content/journals/10.1046/j.1365-2478.1998.00091.x
/content/journals/10.1046/j.1365-2478.1998.00091.x
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  • Article Type: Research Article

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