基于L阵的低计算复杂度二维波达方向估计

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Nyst?m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。

Low Computation Complexity 2-D Direction of Arrival Estimation for L-Shaped Array

A 2-D direction of arrival estimation method for L-shaped array with low computation complexi-ty and high accuracy was presented. Firstly, the subarray cross-correlation matrix of L-shaped array and the conjugate exchange properties of the uniform linear array steering vectors is given, the proposed meth-od extends the array aperture and constructs a new array received data matrix as well. Then the estima-tions of 2-D angles is obtained with the estimating of signal parameters via rotation invariance techniques algorithm. Finally, the subspace is estimated via applying the Nyst?m method to the autocorrelation-like matrix, which is reconstructed by Toeplitzation-the diagonal elements of the subarray cross-correlation ma-trix without loss of the array aperture. Therefore, the correct angle pairing is achieved with a few angle search. The proposed method does not require massive angle search, and is high in the angle estimation accuracy, low in computation complexity and few in the necessary number of snapshots. Simulation is presented to validate the correction and effectiveness of the proposed method.