Dual-Polarized Ground-Penetrating Radar Method for Sizing Cylindrical Metal Bars

Ground-penetrating radar (GPR) is a widely used non-destructive technique for detecting and locating subsurface metal bars in civil engineering structures. However, accurately characterizing the size of the metal bars remains a challenge for current GPR methods. In this work, we propose a new approach for estimating the diameter of metal bars using dual-orthogonally-polarized GPR systems. By establishing the theoretical relationship between the bar diameter and the power ratio of reflected signals acquired by perpendicular and parallel polarized antennas, the bar diameter can be estimated from the measured power ratio. The effectiveness of the method has been examined in different numerical scenarios. More experimental results will be presented at the workshop.