一种基于平行互质阵列时空扩展的二维波达方向估计

2-D DOA Estimation Method Based on the Spatial-temporal Augmentation of Parallel Co-prime Array

为了实现对平行互质阵列的孔径扩展,提升信号波达方向估计性能,基于平行互质阵列,首先给出一种改进阵列结构,然后采用共轭空时增广的思想,得到一种对称的平行互质虚拟阵列,由于共轭空时增广联合利用了信号在空间、时间的特征,使得扩展的虚拟阵列比现有方法具有更多的虚拟阵元数和自由度,最后利用稀疏重建方法,实现二维波达方向的估计。仿真实验均验证了所提出的方法在估计精度上的有效性。

In order to achieve the expansion of the parallel co-prime array,and improve performance of the direction-of-arrival (DOA) estimation,this paper firstly proposes an improved array structure based on the parallel co-prime array,and then the symmetry parallel co-prime virtual array is obtained by utilizing the idea of conjugate spatial-temporal augmentation.By jointly utilizing the signal characteristics of space and time domain based on the conjugate spatial-temporal augmentation,the number of virtual array elements and degrees of freedom can be further improved.Finally,the sparse reconstruction method is used to estimate the two-dimensional (2-D) direction of arrival.Simulation experiments verifies the effectiveness of the proposed method in estimating accuracy.