Recent advances in wall characterization and fast target imaging in through-the-wall radar

This paper presents an overview of our recent works in real-time techniques for wall parameter estimation, intra-wall imaging, and target imaging for through-the-wall radar systems. First, the suitability and performances of various monostatic and bistatic radar-based techniques for parameter estimation of external and/or internal walls are discussed. Then efficient Diffraction Tomography algorithms, which use the extracted wall parameters, for enhanced 3D imaging of objects within the wall and targets behind walls are presented. Applications of these techniques are demonstrated through measured and numerically simulated examples.