Abstract
Reverse time migration (RTM) technology has been widely used in seismic imaging measurement of complex structures because it is not affected by the changes of formation structure and lithology. This paper expanded it to the Ground penetrating radar (GPR) imaging of unknown subsurface detection scenes. The gprMax tool based on the finite difference time domain method (FDTD) is used to calculate the forward and backward extrapolation of the electromagnetic wave field, and the 2D and 3D RTM is realized based on the zero-time imaging condition of the explosion reflector principle. Multiple 2D and 3D simulation experiments show that the RTM algorithm can restore the characteristics of underground structures very accurately, even if the underground structure is complex, such as multiple buried target or nonparallel layered structure.
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