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针对L阵的二维波达方向估计问题,提出了一种低计算复杂度、高精度的二维波达方向估计算法.首先利用L阵子阵互相关矩阵和均匀线阵导向矢量的共轭交换性质扩展阵列孔径,并构造新的阵列接收数据;然后利用旋转不变子空间算法得到二维角度估计;最后将子阵互相关矩阵对角元素Toeplitz化,在不损失阵列孔径的情况下重构出类阵列自相关矩阵,利用Nystm方法得到信号子空间估计,进而通过少量角度搜索得到正确的二维角度配对.该算法无须大量角度搜索,具有角度估计精度高、运算量小、所需快拍数少的优点.理论分析和仿真实验结果证明了算法的正确性和有效性.
Aiming at the problem of two-dimensional DOA estimation of L-array, a two-dimensional DOA estimation algorithm with low computational complexity and high precision is proposed.Firstly, conjugate exchange between matrix L of matrix L and uniform linear array steering vector Then, the rotation invariant subspace algorithm is used to get the two-dimensional angle estimation. Finally, the diagonal elements Toeplitzization of the cross-correlation matrix of the sub-arrays are reconstructed without losing the array aperture The array autocorrelation matrix is used to obtain the signal subspace estimation by using Nystm method and then the correct two-dimensional angle matching can be obtained through a small amount of angle search. The algorithm does not need to search a lot of angles and has the advantages of high accuracy of angle estimation and small amount of calculation. The advantages of small number of snapshots.Theoretical analysis and simulation results show that the algorithm is correct and effective.