基于L型阵列酉变换矩阵重构的二维DOA估计

二维空间信号波达方向（DOA）的估计是阵列信号处理的一个关键研究问题。经典的二维 MUSIC算法固然精度高，但此算法需要二维谱峰搜索，运算较为复杂。提出一种用于L型阵列的二维DOA估计算法，通过矩阵重构使得阵列输出矩阵变为中心对称矩阵，再利用酉变换矩阵将其由复值矩阵变为实值矩阵。该方法可以直接得到目标参数，不需要谱峰搜索，使得运算量大大降低。相比于 L 型阵列适用的增广矩阵束（MEMP）算法，该算法可以估计更多信源的DOA，并能获得较高的分辨率。计算机仿真结果表明，该算法具有较高的DOA估计精度。

Two-dimensional DOA estimation of unitary transformation matrix reconstruction based on L-shaped array

The estimation of the direction of arrival of two-dimensional space signals is the key problem in the field of array antennas.Although the traditional two-dimensional MUSIC algorithm has high precision,it needs two dimensional spectrum peak search and has a large amount of operation.A two-dimensional DOA estimation algorithm for L-shaped array was proposed.The output matrix was transformed from a complex value matrix to a real value matrix by matrix reconstruction and a unitary transformation matrix.This method could directly get the elevation angle of the target without conversion,which greatly reduced the amount of operation.Compared with the matrix enhancement and matrix pencil algorithm for L-shaped array,this algorithm could estimate more targets’DOA.The results of simulation show that the algorithm has a high accuracy of DOA estimation.