Underground focusing spotlight synthetic aperture radar for tunnel detection applications

This work studies the concept of a underground focusing plane-based synthetic aperture radar (UF-SL-SAR) by analyzing two different scenarios. The first scenario is a sandy, non-dispersive, homogeneous and rough soil. In this case successful underground focusing can be performed and the scattered field produced by the tunnel just above the rough surface dominates that of by the rough ground surface alone. On the other hand, when a lossy, dispersive, homogeneous and rough clay loan soil is used, the amount of scattered field achieved just above the ground is not enough to perform a suitable tunnel detection, because the field scattered by the rough surface is dominant in this case.