Underground objects of a passive type can manifest themselves only as a result of thermal stimulation of which typical is the use of natural solar radiation. In this case, a particular temperature difference between the background and the site with buried objects appears with the optimum observation time being dependent on object depth. Meteorological conditions strongly affect the ground surface temperature but their correct modelling is difficult. A microwave source was used to increase the detection probability of buried objects by using the IR thermography method. A time-gated microwave source delivers heat energy soil, thus allowing the detection of subsurface features that are sensitive to microwave irradiation. In this paper, the results of using microwave stimulation in order to enhance thermal indications over buried landmines are presented.
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