Abstract—

The systems of short-range radiolocation and multistatic radio holography based on multielement MIMO antenna arrays (AAs) with recirculation of orthogonal signals in the spatial feedback circuits of AA transmitting element–​​target–AA receiving element–AA transmitting element are investigated. The generalized ambiguity function in spatial coordinates for an ensemble of coherent orthogonal sounding signals with allowance for the partial propagation constants of the feedback circuits is obtained. The characteristics of the range, azimuth, and elevation resolution in MIMO retrodirective systems are determined based on the analysis of two-dimensional and one-dimensional sections of the generalized ambiguity function (GAF). For the centimeter wavelength range, the GAF cross sections of the azimuth–elevation and range–elevation are compared with and without recirculation as well as at different ranges to the target. The results show the presence of super-resolution effects in MIMO systems with spatial signal recirculation and a nontrivial dependence of the resolution on the target range.

中文翻译：

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基于 MIMO 后向天线阵列的雷达和无线电全息系统的超分辨率

摘要-

研究了基于多单元 MIMO 天线阵列 (AA) 的短距离无线电定位和多基地无线电全息系统，并在 AA 发射元件 - 目标 - AA 接收元件 - AA 发射元件的空间反馈电路中进行正交信号的再循环。在考虑到反馈电路的部分传播常数的情况下，获得了一组相干正交探测信号的空间坐标中的广义模糊度函数。MIMO 逆向系统中距离、方位角和仰角分辨率的特性是基于对广义模糊函数 (GAF) 的二维和一维部分的分析来确定的。对于厘米波长范围，比较了有和没有再循环以及与目标的不同距离的方位角 - 仰角和距离 - 仰角的 GAF 横截面。结果表明，在具有空间信号再循环的 MIMO 系统中存在超分辨率效应，并且分辨率对目标范围有重要依赖性。