用于超宽带高分辨率成像的二维稀疏MIMO面阵拓扑结构研究  

Two-dimensional sparse MIMO array topologies for UWB high-resolution imaging

作　　者：谭恺[1,2] 吴世有[1] 王友成[1,2] 叶盛波[1] 陈洁[1] 方广有[1] 

机构地区：[1]中国科学院电子学研究所,北京100190 [2]中国科学院大学,北京100039

出　　处：《电波科学学报》2016年第4期779-785,共7页Chinese Journal of Radio Science

基　　金：国家科技支撑计划(2014BAK12B03);国家863计划(2012AA121901);国家自然科学青年基金(61501424);北京市交通委员会科技支撑项目(TC1405473)

摘　　要：分析并总结了超宽带二维多输入多输出(Multiple Input Multiple Output,MIMO)面阵拓扑结构设计的两条原则——等效孔径的均匀性与无明显遮蔽性,并根据这两条原则提出了一种用于超宽带近距离高分辨率成像的新型面阵拓扑结构.与尺寸、阵元数相同的MIMO面阵相比,该新型面阵结构在仿真获取的方向图中具有更好的聚焦效果和旁瓣抑制能力.并且,不同距离下的聚焦结果显示,该面阵的峰值旁瓣水平均要低于另两个阵列2dB以上.对复杂目标成像的实验结果进一步证明了该阵列良好的成像性能.结合其等效阵元数量较少的特点,文中提出的这种新型MIMO面阵拓扑结构为高效、实时的超宽带近距离高分辨率成像应用提供了可能.In this paper, two principles for designing two-dimensional （2D） multiple-input multiple- output （MIMO） array topology are summarized, which are uniform distribution and less element shadowing for effective aperture. According to these two design principles, a novel 2D MIMO antenna array topology is proposed for UWB short-range high-resolution imaging. Compared with other two different arrays having the same number of transceivers, the proposed array has a better control over the sidelobe level （SL） both in the interference region （IR） and non-interference region （NIR） of the simulated radiation patterns. And for patterns of different focusing distances, the peak sidelobe levels （PSLs） of the proposed array are lower than the compared ones over 2 dB. Experimental imaging results for a distributed target also verify the outstanding imaging capability of the proposed array. Therefore, with a small number of effective elements, the proposed array topology has potential applications for high-efficiency ultra- wideband short-range imaging.

关 键 词：超宽带雷达技术 高分辨率成像 MIMO阵列 二维面阵拓扑结构 

分 类 号：TN955[电子电信—信号与信息处理]