Detection of concealed targets in through-the-wall imaging

The development of technologies for the detection of concealed targets such as weapons, explosives, and other threats is a very important topic in the framework of homeland security and surveillance. The Guide to the Technologies of Concealed Weapon and Contraband Imaging and Detection published in 2001 by the US From a technological point of view, the detection of concealed targets in through-the-wall radar imaging (TWRI) requires different solutions as compared to those exploited in typical concealed weapon detection cases. Conversely, detecting and imaging concealed threats in the framework of TWRI requires developing ad hoc methodologies, having specific features. The linear sampling method (LSM) is an imaging method that has been proposed in the mathematical literature to tackle the so-called inverse obstacle problem. The results achieved in the mathematical literature assess the applicability of the LSM only in some specific conditions.