基于虚拟孔径扩展的稀疏嵌套阵设计  

Sparse Nested Array Design for Virtual Aperture Extension

作　　者：闫肃[1] YAN Su(School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学信息与电子学院,北京100081

出　　处：《北京理工大学学报》2021年第1期79-83,共5页Transactions of Beijing Institute of Technology

基　　金：国家自然科学基金资助项目(61801024)。

摘　　要：为提高阵列自由度,提出了一种稀疏嵌套阵设计方法.该方法将增广嵌套阵(augmented nested array,ANA)中右侧子阵阵元与中间子阵距离稀疏化,从而扩展最远孔径.为保证虚拟孔径连续性,进一步提出了一种新型嵌套阵,即单侧稀疏嵌套阵.与ANAI-2、改进嵌套阵和最大阵元间距约束(maximum inter-element spacing constraint,MISC)阵列相比,该结构具有更长的连续段.仿真实验验证了提出结构在自由度、估计精度方面的优越性.A sparse nested array concept of distributing the right-side elements of two level augmented nested array(ANA)sparsely was proposed for degree of freedom(DOF)enhancement.The new strategy was arranged to make the distances between the right-side elements and the right most sensor in the middle subarray of ANA larger than N1 to extend the furthest aperture successfully.In order to keep the continuity of virtual aperture,a new nested array,referred to as one side sparse nested array(OS-SNA),was proposed.Compared with the improved nested array ANAI-2 and maximum inter-element spacing constraint(MISC),the new nested array can generate more consecutive lags.Simulation results show the superiorities of the proposed OS-SNA in DOF and the precision estimation.

关 键 词：稀疏嵌套阵 DOA估计 自由度 

分 类 号：TN911.7[电子电信—通信与信息系统]