High-order extended coprime array design for direction of arrival estimation  

作　　者：SHI Junpeng WEN Fangqing LIU Yongxiang LIU Tianpeng LIU Zhen 

机构地区：[1]College of Electronic Science,National University of Defense Technology,Changsha 410073,China [2]College of Electronic Countermeasure,National University of Defense Technology,Hefei 230037,China [3]College of Computer and Information Technology,China Three Gorges University,Yichang 443002,China

出　　处：《Journal of Systems Engineering and Electronics》2021年第4期748-755,共8页系统工程与电子技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(62071476,62022091,61801488,61921001);the China Postdoctoral Science Foundation(2021T140788,2020M683728);the Science and Technology Innovation Program of Hunan Province(2020RC2041);the Research Program of National University of Defense Technology(ZK19-10,ZK20-33).

摘　　要：Nonuniform linear arrays,such as coprime array and nested array,have received great attentions because of the increased degrees of freedom(DOFs)and weakened mutual coupling.In this paper,inspired by the existing coprime array,we propose a high-order extended coprime array(HoECA)for improved direction of arrival(DOA)estimation.We first derive the closed-form expressions for the range of consecutive lags.Then,by changing the inter-element spacing of a uniform linear array(ULA),three cases are proposed and discussed.It is indicated that the HoECA can obtain the largest number of consecutive lags when the spacing takes the maximum value.Finally,by comparing it with the other sparse arrays,the optimized HoECA enjoys a larger number of consecutive lags with mitigating mutual coupling.Simulation results are shown to evaluate the superiority of HoECA over the others in terms of DOF,mutual coupling leakage and estimation accuracy.

关 键 词：high-order extended coprime array(HoECA) direction of arrival(DOA) degree of freedom(DOF) mutual coupling 

分 类 号：TN911.7[电子电信—通信与信息系统]