Modeling the Detection and Localization of Anti-Personnel Landmines using Ground-Contact Antennas for Ground-Penetrating Radar
In 2011, over 5,000 casualties due to landmines were reported worldwide, necessitating the development of effective detection techniques. Over the last few decades ground penetrating radar (GPR) has developed into a popular tool for subsurface imaging and a promising technique to fulfill this requirement. However, landmines are typically buried under rough ground surfaces where conventional air-coupled GPR data is difficult to analyze, as the surface scatters the signal in unpredictable ways. This is particularly true for small non-metallic mines which have very small radar contrast with the soil background. By utilizing a ground-contact radar system, wave penetration is dramatically improved and data analysis is simplified.
This work demonstrates the feasibility of using three bistatic ground-coupled antennas to triangulate the location of a landmine buried in rough, dispersive soil using a geometric analysis. Additionally, the limitations of this method are analyzed with regard to the correlation length and height variance of the rough surface. In this work the received GPR data is simulated using a 3-dimensional finite-difference time-domain (FDTD) model. As shown in the results, the presented method is highly effective in both detecting and locating the target independent of the landmine casing and the surface parameters. Though this research currently focuses on localizing landmines, this technology will have numerous potential imaging applications for cases when traditional GPR cannot be used due to the roughness of the surface.