报告题目：GPR full-waveform inversion, recent developments, and future opportunities
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.
刘涛，博士，国防科技大学电子科学学院讲师，主要研究领域为表层穿透雷达成像和电磁反演，曾在德国于利希研究中心从事研究访学工作两年。在Geophysics、Remote Sensing等国际期刊及International Conference On Ground Penetrating Radar (GPR)、International Workshop on Advanced Ground Penetrating Radar(IWAGPR)等国际会议发表论文8篇，曾获IWAGPR2017最佳学生论文。当前主要负责某型穿透雷达的研制工作。