High-resolution 3-D imaging algorithm without derivative operations for UWB through-the-wall radars

We proposed a modified envelope as high-resolution 3D imaging algorithm for through-the-wall UWB radars. This algorithm utilizes the principle that the target boundary behind the wall can be expressed as an envelope of modified spheres, which are determined from the electric permittivity and thickness of the wall. In numerical simulation, we confirmed that the proposed method achieves higher-resolution 3-D imaging for advanced through-the-wall applications. It is our future task to develop the imaging algorithm with the wall permittivity and thickness estimation.