A Closed-Form Result for Localization in TWI Geometry

Through-the-Wall Imaging (TWI) is of great interest for surveillance applications. Linear inversion algorithms are often adopted to localize objects. The Point Spread Function (PSF) concept is a powerful tool for understanding the performance of the system because it provides the minimum detail that can be reconstructed. In this paper, we discuss an approximation of the exact PSF for a TWI geometry, considering a single frequency and multiple views in the near-zone field, aiming at estimating the achievable resolution. A cylindrically stratified medium is considered because it allows to achieve analytical results which show that the approximated PSF works well compared to the exact one