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Advances in real time and sparse reconstructed radar imaging through multilayered walls

This paper gives an overview of the authors' works on two techniques that address some of the challenges in Through-the-Wall Radar Imaging. The first technique utilizes Diffraction Tomography (DT) to achieve near real-time and high resolution 2D and 3D imaging of targets behind multilayered walls when full collected data is available, whereas the second technique addresses the long data acquisition issue associated with most TWRI scenarios by using the concept of Compressive Sensing (CS) to significantly reduce the number of transmitting and/or receiving antennas and collected frequency points in a SAR or MIMO based TWRI system. Both techniques fully incorporate all wall effects on electromagnetic wave propagation and result in accurate geolocation and high resolution imaging. In addition, we discuss estimation of a multi-layered wall's thickness, dielectric constants and conductivities, when radar data at a limited number of frequency points are available.