Contactless Ground Penetrating Radar Imaging: State of the art, challenges, and microwave tomography-based data processing

This article provides a comprehensive overview of the current state of the art in contactless ground-penetrating radar (GPR) systems. These devices offer many large-scale subsurface sensing possibilities based on different observation platforms and measurement configurations. On the other hand, new challenges must be faced because the radar system is not coupled directly to the ground; hence, data...