Array Design and Imaging Method for Ultra-wideband Multiple-input Multiple-output Through-the-wall Radar

The configuration of the Multiple-Input Multiple-Output (MIMO) array is a good choice for a sparse aperture array for Ultra-WideBand (UWB) through the wall imaging radar. According to the imaging model, an equivalent array for UWB MIMO antenna arrary is analyzed and a design approach for UWB MIMO arrary based on the principle of spatial convolution is given. Simulation results demostrate the effectiveness of the design approach and the feasibility of its application to through-the-wall imaging system. In addition, an adaptive imaging method using coherent coefficient weighting robust Capon beamforming is proposed. Both the theoretical analysis and the experimental results show that the proposed method can achieve high resolution and signal-to-noise ratio in the image.