基于均匀圆阵的二维DOA估计的新算法

文章针对均匀圆阵的阵列流形，分析了均匀圆阵的导向矢量，并在此基础上，通过构造相应的二阶统计量得到了信号方位角和俯仰角的闭式解．同已有的二维DOA估计算法相比较，该算法有明显的计算优势，只需要3个阵元即可以达到二维DOA估计的结果．理论分析证明，该闭式解不受空间白噪声的影响，只要选取适当的快拍数，该算法可以在较低的信噪比环境下稳健的工作．计算机仿真结果表明，该算法可以利用圆阵的3个阵元有效地估计信号的二维到达角，并且减少了运算量，降低了白噪声的影响，可以稳健而有效的工作．

The estimation of 2-D DOA based on uniform circle array

Analysis was done on the steering vector of the uniform circular array(UCA) aiming at the geometry of the uniform circular array. Constructing the corresponding to the two order statistics based on the foregoing analysis,the closed_form solution of the azimuth and elevation angle can be achieved. Compared with the existing 2-D direction of arival(DOA) estimation algorithm, the superiority of this algorithm is evident in the computational load. Utilizing only the three element of the array, the 2-D DOA can be estimated. Theoretical analysis indicates that the closed-form solution is not impacted by white noise and operates robustly in the lower signal_to noise ratio(SNR) as long as the number of the snapshot is suitable. Computer simulations verify the efficiency of this algorithm.