一种基于L型阵列的改进的二维DOA估计方法  

An improved method for estimating two-dimensional DOA based on L-shape array

作　　者：杨艳飞[1] 高健[1] 张兴敢[1] 

机构地区：[1]南京大学电子科学与工程学院,南京210023

出　　处：《南京大学学报（自然科学版）》2016年第5期953-959,共7页Journal of Nanjing University（Natural Science）

基　　金：毫米波国家重点实验室开放课题(K201514)

摘　　要：二维DOA估计在电子侦察、智能天线、雷达等方面都有广泛应用.二维DOA估计的方法有很多,主要用水平面L型阵列和ESPRIT算法进行二维DOA估计.提出用水平线阵和垂直线阵构建L型阵列,分成四个子阵,计算四个互相关矩阵,四个互相关矩阵构造一个特殊的大矩阵,对该矩阵进行特征值分解获得信号子空间估计,再用ESPRIT算法进行方位角和仰角的估计.该方法可以直接得到目标仰角,不需要换算,简化了计算,通过子空间估计,提高了DOA估计的分辨率并可以估计更多目标的DOA.仿真结果表明本文的改进二维DOA估计方法提高了DOA估计的精度.Two‐dimensional direction of arrival estimation has been widely used in electronic reconnaissance ,smart antenna ,radar ,etc ,and it can accurately describe the spatial characteristic information of the incident signal .The two‐dimensional direction of arrival estimation plays a important role in the multidimensional parameter estimation of array signal .Many scholars both domestic and foreign have done a lot of researches and obtained many results which have great impact in this field .There are plenty of methods for 2‐D DOAestimation .In this paper ,we mainly use the ESPRIT algorithm based on the L‐shape array to estimate the DOA .We propose to construct a L‐shape array by using horizontal line array and vertical line array and divide the L‐shape array into four sub arrays ,then calculate cross correlation matrices each other which are used to construct a special large matrix .The signal subspace estimation is acquired via the eigenvalue decomposition of the constructed matrix .After that we use the ESPRIT al‐gorithm estimate azimuth and elevation .This method can obtain the elevation angle of the target directly .Compared with the traditional ESPRIT algorithm of L‐shape array ,this method not ony does not need to be converted but also can simplify the calculation .Through the subspace estimation ,the resolution of DOA estimation is improved and the＆amp;nbsp;DOA of more targets can be identified .Simulation results show that the improved two‐dimensional DOA estimation method promotes the accuracy of DOA estimation .

关 键 词：波达方向估计 ESPRIT方法 L型阵列 相关矩阵 

分 类 号：TN957.51[电子电信—信号与信息处理]