Road Radar Electromagnetic Wave Simulation Of Two-dimensional Finite Difference Time Domain Method And Applied Research

As a new type non-destructive technology, the Ground Penetrating Radar (GPR) has been widely used, due to its speed, nondestructive, high effective, lower-cost and high-resolution imaging ability. But up to now, the automated degree of the GPR image interpretation is lower, and there are many man-made factors. So the results bring about much subjectivity. Through the analysis of the forward model of various pavement structures, firstly, we can acquire more understanding to the reflective section of GPR, accumulate experiences during the course of distinguishing underground structures according to the GPR image, and improve the precision of explaining the image. Secondly, We can develop the backward simulation and validate the validity of the backward simulation arithmetic through using the results of the known forward model. At the same time, the development of forward simulation can promote the GPR technology effectively.Finite Difference Time Domain (FDTD) method has been a mature electromagnetic numerical calculating method through more than forty's development. And it had been applied in almost all electromagnetic fields. And being an important achievement of time domain transient electromagnetic field theory, the basic principle of GPR transmitting accords with the electromagnetic theory. So the research of forward simulation is done in this paper based on the 2D-FDTD method.The main achievements and conclusions of this paper are summarized below:1. Based on the basic principle of electromagnetic wave theory, the forward model of GPR electromagnetic wave which transmits in the typical pavement structures is established, the relative computer program of the forward simulation is compiled, and the validity of the forward simulation is validated through theory calculating. The research that the variety of pavement material's dielectric constant or conductivity influences GPR echo signals is further developed, and the relevant conclusion has been achieved.2. The forward model of GPR electromagnetic wave which transmits in roadbed under which metals, voids or medium targets are is established. Through the forward simulating, the research that variety of roadbed's dielectric parameters (dielectric constant or conductivity), horizontal size, thickness, depth, figures of underground targets influences the GPR reflective wave is developed. Thus, the result can be helpful...