Ray-based Simulation Method Of Ground-penetrating Radar Signals

Ground-Penetrating Radar (GPR) is an high efficient unimpaired technique for exploration under the earth. In GPR, high frequency electromagnetic waves are transmitted from earth surface and the structures and physical characteristics of underground medium can be concluded by the received reflect electromagnetic waves. Ground penetrating radar has been already widely used in the fields of hydrology, engineering, environment etc with its merits such as high speed exploration, no impair, high distinguish-ability, real time tomography etc. The numerical synthesis simulation research is a key and also difficult problem about GPR, which can help recognize the radar section plane and provide references for actual radar profile interpretation. This dissertation uses the ray-based method to numerically synthesize 2-D GPR profiles, and the ray-tracing algorithm we developed has been successfully used for electromagnetic wave field data in GPR.We present a wave front spread ray-tracing network algorithm on the base of traditional shortest path algorithm. We investigate interpolation method based on Fermat law which can greatly improve the calculation precision; and by using the data structure of full binary heap to get the shortest path value node and in which the new nodes are inserted in a queue, the calculation efficiency of the wave front spread ray-tracing network algorithm can be greatly improved, thus the complex calculation process based on Snell law for the ray path solution can be avoided. The emulational result proves that the wave front spread ray-tracing network algorithm can be used in any models with anomalous reflection layers without change, i.e., has a high adaptability, and both the precision and the calculation efficiency of the algorithm can be greatly improved. By this new algorithm, all the reflected points on the same layer can be found at one time, which is an unique advantage over other...