報告題目：GPR full-waveform inversion, recent developments, and future opportunities
報告時間：2019年1月4日上午8：30
報告地點：鐵道校區(qū)第一綜合樓308會議室
報告簡介：
Precise radius estimation is of high interest for rebar and pipe characterization but very challenging. Ray-based radius estimations of subsurface cylindrical objects such as rebars and pipes from ground-penetrating radar (GPR) measurements are not accurate because of their approximations. We have developed a novel full-waveform inversion (FWI) approach that uses a full-waveform 3D finite-difference time-domain (FDTD) forward-modeling program to estimate the radius including other object parameters. By using the full waveform of the common-offset GPR data, the shuffled complex evolution (SCE) approach is able to reliably extract the radius of the subsurface cylindrical objects. A combined optimization of radius, medium properties, and the effective source wavelet is achieved. Synthetic and experimental data inversion returns an accurate reconstruction of the cylinder properties, medium properties, and the effective source wavelet. Combining FWI of GPR data using SCE and a 3D FDTD forward model makes the approach easily adaptable for a wide range of other GPR FWI approaches.
報告人簡介：
劉濤，博士，國防科技大學電子科學學院講師，主要研究領域為表層穿透雷達成像和電磁反演，曾在德國于利希研究中心從事研究訪學工作兩年。在Geophysics、Remote Sensing等國際期刊及International Conference On Ground Penetrating Radar (GPR)、International Workshop on Advanced Ground Penetrating Radar(IWAGPR)等國際會議發(fā)表論文8篇，曾獲IWAGPR2017最佳學生論文。當前主要負責某型穿透雷達的研制工作。
