Radar images of the covered trenches FDTD simulation

Results of computer simulation of the video pulse electromagnetic wave scattering in the media containing a dielectric insertion of rectangular or trapezoidal form imitating the backfilled trenches are presented. The finite difference time domain (FDTD) method and the second-order Mur absorbing boundary condition are used for the task solving. Radar images of rectangular form trenches have been analyzed in dependence on depth and width of the trench and on the spacing between the sounding field source and observation point (in other words on the separation between the transmitting and receiving antennas of the GPR). It is ascertained common properties, typical for the radar images of all type of trenches and individual properties typical only for the trenches either, one or another type. It is investigated distinctions of the radar images.