Abstract
Recently millimeter-wave 3D imaging employing 2D array has shown several advantages rather than a scanning 1D array. This paper presents a fast 3D near-field imaging algorithm that is formulated for 2D wideband multiple-input-multiple-output (MIMO) cross-array topology. The proposed algorithm performs the imaging reconstruction process in the spatial-wavenumber domain. The algorithm is able to completely compensate the curvature of the spherical wavefront in the nearfield through a special spherical-wave decomposition and provides fast imaging method by application of the fast Fourier transform. The algorithm is based on the assumption that the receivers and transmitters are evenly distributed. The image performance and computational efficiency of the algorithm are demonstrated with numerical simulations using 2D MIMO cross-arrays.
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