中文摘要：

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。

英文摘要：

For increasing the cross-range resolution of the sector-scan imaging system,a multiple-input multiple-output（MIMO）array with high cross-range resolution is designed in this paper.Firstly,the general equialent model for both narrowband and wideband signals between the MIMO array and its virtual array is established.When transmitting waveforms have good auto-and cross-correlation properties,the outputs of matched filters of the MIMO array are equivalent to the rangecompressed echoes of a single-input multiple-output（SIMO）array and hence.In this case,the MIMO array is equivalent to a virtual array.Then,basing on the equivalence the analytical solutions of coordinates of virtual transmitting and receiving elements are given based on the equivalence.Then,under the condition of using constant array physical size,a new MIMO array composed of two transmitting elements and N-element receiving uniform linear array（ULA）is designed.Theoretical analysis and numerical simulations show that the designed MIMO array obtains the best cross-range resolution,when compared to the SIMO array and other MIMO array layouts with the same physical size.