特殊阵列的二维到达角方向估计

在特殊均匀线阵的基础上，提出一种二维DOA估计新方法，利用参考阵列的旋转不变性构造整个虚拟阵列的旋转不变性，采用横向和纵向双重扩展提高了阵列的扩展性能，并实现四阶累积量矩阵的无冗余数据处理. 新方法只需计算两个四阶累积量矩阵就可获得信号子空间的估计，进而利用二维ESPRIT方法求得最终的解. 理论分析和仿真实验表明，该算法计算量低，阵列扩展能力强，估计精度高，具有一定的实用性.

TWO-Dimensional Direction-of-Arrival Estimation Based on Special Array

A new method for estimating two-dimensional direction-of-arrival based on a special linear array is presented. Rotational invariance of the virtual array can be obtained from rotational invariance of the reference array using the method of two-direction expansion, which improves the array’s expansion ability and eliminate redundant data of the forth-order cumulant matrix. Using the new method, the signal subspace can be estimated from only two forth-order cumulant matrices. DOA estimation can be achieved by the 2D ESPRIT method. The theoretical analysis and simulation results show that this method has low computation cost, excellent expansion ability, high estimation precision, and good practicality.