Forward Modeling Of Ground Penetrating Radar Image Based On GPRMAX

The construction of the modern city can not be separated from the construction of the urban underground engineering.The underground pipelines,like the blood vessels of the city,play a decisive role in the construction of the city,and the exact position and transformation of the underground pipelines are the most urgent things now.Aiming at underground pipelines,the latest GprMax software and Matlab and python language are used to model the isotropic medium for various situations of underground pipelines.The metal and non-metal models of underground pipelines are established,and the response characteristics of metal and non-metallic pipelines are analyzed to analyze the characteristics of different pipelines and provide basis for data interpretation.The model of different pipe diameter,buried depth and tube spacing is set up,the pipe diameter,depth and distance between pipes are changed,the changing law of pipeline property in ground penetrating radar is discussed,and the numerical simulation diagram is compared and analyzed.The detection ability and resolution of the pipeline for different attributes are limited,and the different Guan Xianxiang characteristics need to be judged.According to the actual construction of the three kinds of pipeline difficulties modeling analysis and comparison,the three kind of pipeline is drainage,power and water supply.The problem of buried well and full water in the drainage,the small diameter of the power line,the difficulty of detection and the deep interference of the water supply line are deep.In view of these three problems,the modeling analysis is carried out and finally the conclusion is drawn.In order to solve the problem that the response characteristics of the pipeline are not obvious,Hilbert and wavelet transform are used to deal with the numerical simulation results,to extract the abnormal point of the weak signal and to accurately judge the information of the pipeline buried depth and so on.