Abstract
The simulation of ground penetrating radar (GPR) signal in the case of freezing/thawing soil was performed with the use of the method of auxiliary sources (MAS), the invariant imbedding method, and the spectroscopic soil dielectric model, which takes into account the unfrozen water factor. For this purpose, the 2 – D wave diffraction problem was formulated and solved, with the GPR target, in the form of impedance cylinder, being located underground at a given depth. The straight line transmitter/receiver antenna was placed on the ground. The complex permittivity profiles with the depth, through freeze/thaw period, were derived, using the spectral dielectric model and the real temperature profiles measured at the Franklin Bluffs test site in Alaska. Thus modeled GPR images demonstrated, under varying weather conditions, the impact of frozen/thawed boundary on detecting the objects, being located in the active permafrost layer.
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