阵列设计作为多输入多输出(MIMO)雷达成像系统中的一项关键技术直接影响系统成像性能。通过分析MIMO雷达成像模型, 探讨了基于等效阵列概念的MIMO阵列设计方法, 并讨论了近场效应对成像结果的影响。基于所构建的MIMO雷达成像实验系统, 进行了近场微小金属目标二维成像试验。实验结果表明: 该阵列设计方法在120~150 GHz的适用性, 验证了毫米波MIMO雷达近场成像能力。

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.