Numerical simulation method of ground-penetrating radar identification of piping based on finite-difference-time-domain method

On the basis of optimizing the frequency of ground-penetrating radar antenna, window length and sampling interval, a two-dimensional finite-difference-time-domain (FDTD) model for solving the Maxwell discrete equation for the electromagnetic wave is established. When there is one piping leakage point in the homogeneous soil, the piping size interpreted by the radar wave image is similar to the designed size. When there are two piping leakage points, the interference phenomenon of two reflected waves can be clearly simulated and the location and size of the two leakage points can be determined. A double horizontal layer soil is considered, and a piping point is located in the bottom soil layer, the piping position and size can still be accurately interpreted. The numerical test results show that the FDTD method for forward modeling is a very effective simulation technology and method for the identifying soil piping using ground-penetrating radar electromagnetic wave.