一种用于高分辨扇扫成像的MIMO阵列

发布时间：2018-04-19 04:18

本文选题：成像技术 + 扇扫成像　；参考：《航空学报》2014年09期

【摘要】：为了提高扇扫成像系统的方位分辨率,设计了一种具有高方位分辨率的多输入多输出(MIMO)阵列。首先,建立了同时适用于窄带和宽带信号的MIMO阵列与虚拟阵列之间的等效模型。在分析匹配滤波输出成分的基础上,证明了当发射信号具有良好相关特性时,MIMO阵列的匹配滤波输出可等效为单输入多输出(SIMO)阵列上经过脉冲压缩后的回波。接着,根据这一等效关系,获得了与MIMO阵列等效的虚拟阵列中虚拟发射阵元与虚拟接收阵元坐标解析解。最后,在约束阵列物理尺寸为固定值的前提下,利用该解析解设计出一种由2个发射阵元和一条接收均匀线阵列(ULA)组成的MIMO阵列。理论推导和仿真结果表明:所设计的MIMO阵列可以在恒定的物理尺寸和虚拟阵列为均匀直线阵的前提下,获得优于其他MIMO阵列和SIMO阵列的方位分辨率。
[Abstract]:In order to improve the azimuth resolution of fan scan imaging system, a high azimuth resolution multiple input multiple output MIMO-array is designed.First, an equivalent model between the MIMO array and the virtual array for both narrowband and wideband signals is established.Based on the analysis of the output components of the matched filter, it is proved that the matched filtering output of the MIMO array can be equivalent to the pulse compressed echo of the single input multiple output (SIMO) array when the transmitted signal has good correlation characteristics.Then, according to this equivalent relation, the coordinate analytic solutions of virtual emitter array and virtual receiving array element in virtual array are obtained, which are equivalent to MIMO array.Finally, under the condition that the physical size of the array is fixed, a MIMO array composed of two emitter elements and a receiving uniform line array is designed by using the analytical solution.Theoretical derivation and simulation results show that the designed MIMO array can obtain better azimuth resolution than other MIMO arrays and SIMO arrays on the premise of constant physical size and the virtual array is a uniform linear array.
【作者单位】：西北工业大学声学工程研究所;
【基金】：国家自然科学基金(11104222) 西北工业大学博士论文创新基金(CX201101)~~
【分类号】：TN919.3

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