针对点目标扩展函数 (PSF)不能有效分析复杂目标在毫米波近场多入多出 (MIMO)雷达成像中的散射机理问题, 研究了一种基于近场物理光学散射计算数据的毫米波 MIMO雷达成像模拟方法。该方法利用近场物理光学方法, 获得包含阵列构型和目标散射信息的近场计算数据, 并通过近场 MIMO成像处理器实现近场 MIMO成像的全过程模拟。利用 D波段“ T”字型二维稀疏 MIMO阵对复杂的三维目标开展了近场成像实验, 仿真和实验结果表明, 模拟结果与实际成像结果有很好的一致性。该方法能够分析近场 MIMO成像系统的成像性能, 为近场 MIMO成像的阵型设计提供支撑, 揭示复杂目标的近场散射特性与成像机理。

In view of the Point Spread Function(PSF) for near-field Multiple-Input Multiple-Output (MIMO) radar imaging cannot analyze the scattering mechanism of complex targets effectively, a simulation method of millimeter wave near-field MIMO radar imaging based on near-field Physical Optical(PO) scattering data is studied. The method uses near-field physical optics method to compute the near-field scattering field including the information of array configuration and scattering mechanism. Near-field MIMO image is finally generated by imaging processor. Using the D-band "T"-shaped two-dimensional sparse MIMO arrays to carry out the near-field imaging experiment, the simulation results are in good agreement with the actual imaging results. This method can analyze the imaging performance of the near-field MIMO imaging system, support the formation design, and reveal the near-field scattering characteristics and imaging mechanism of complex targets.