Sparse array in near-field millimeter-wave multiple-input multiple-output radar imaging system

In multiple-input multiple-output (MIMO) radar imaging systems, the configuration of antenna array as one of the key techniques has great effects on image quality. Based on the imaging model of MIMO radar, the sparse array design method taking advantage of the equivalent virtual array concept was discussed, and the near field effects on imaging results were analyzed. Short range two-dimensional imaging experiments for small targets were carried out by the constructed imaging system. The experiment results confirm the validity of this array design method for MIMO radar operating at 120~150 GHz, and the imaging ability of MIMO array in the near field is verified.