双基地展开互质阵列MIMO雷达DOD、DOA降维估计算法  

DOD and DOA reduced-dimension estimation algorithm for unfolded coprime array bistatic MIMO radar

作　　者：周围[1,2] 王强 唐俊[2] 张维[2] ZHOU Wei;WANG Qiang;TANG Jun;ZHANG Wei(College of Electronics Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Chongqing Key Laboratory of Mobile Communications Technology,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学光电工程学院,重庆400065 [2]重庆邮电大学移动通信技术重庆市重点实验室,重庆400065

出　　处：《南京邮电大学学报（自然科学版）》2020年第2期20-26,共7页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：国家自然科学基金(61771085);重庆市基础与前沿研究计划(CSTC2015icyjA40040)资助项目。

摘　　要：展开互质阵列将两个子阵完全展开,因而可在阵元数目受限情况下获得相较于均匀阵列以及传统互质阵列更大的阵列孔径。文中基于双基地展开互质阵列多输入多输出(Multiple Input Multiple Output,MIMO)雷达阵列结构,提出了基于降维多重信号分类(Multiple Signal Classification,MUSIC)算法的双基地展开互质阵列MIMO雷达离开角(Direction of Departure,DOD)、到达角(Direction of Arrival,DOA)联合估计算法。算法通过增加约束并构造代价函数的方式,将二维MUSIC算法中的穷尽搜索二维谱峰转化为求解带约束二次优化问题,先后得到DOA、DOD,并且DOD与DOA自动配对。降维思想的引入使得算法无需二维搜索,因而复杂度显著下降。同时,得益于展开互质阵列MIMO雷达形成的虚拟阵列与大幅扩展的阵列孔径,文中提出的算法亦获得了显著提升的分辨率、自由度以及低信噪比下更为优异的估计性能。此外,子阵数目的互质消除了阵元间距大于半波长可能导致的相位模糊问题。仿真验证了算法的有效性。The unfolded coprime array completely expands the two subarrays,leading to a larger array aperture compared with the uniform array and the conventional coprime array when the number of sensors is limited.Based on the structure of unfolded coprime array bistatic MIMO radar,a direction of departure(DOD)and direction of arrival(DOA)joint reduced-dimension estimation algorithm is proposed.By adding constraints and constructing a cost function,the algorithm converts the two-dimensional spectral peak search in the 2 D MUSIC algorithm into the problem of solving a constrained quadratic optimization.Then,DOA and DOD are obtained,and automatically paired.The ideal of reduced-dimension makes the algorithm only need one-dimensional search,so the complexity is reduced.Furthermore,due to the virtual array formed by the unfolded coprime array MIMO radar and the greatly expanded array aperture,the algorithm also obtains significantly improved resolution,freedom and better estimation performance at low signal-to-noise ratios.In addition,the coprime of the number of sub-arrays eliminates the phase ambiguity caused by sensor spacing greater than half a wavelength.The simulation verifies the effectiveness of the algorithm.

关 键 词：DOA DOD 多输入多输出 展开互质阵列 相位模糊 

分 类 号：TN929.5[电子电信—通信与信息系统]