宽带源DOA快速估计方法

提出了一种新的聚焦矩阵的计算方法,该方法不需要进行角度预估计,也不需要进行任何矩阵特征值分解,对信号方向不敏感,运算量小。利用多级维纳滤波算法,求出聚焦后的空间协方差矩阵在Krylov子空间的一组正交基,在满足一定的条件下,该正交基张成的空间等价于信号子空间,从而可求得宽带信号的空间谱。整个过程避免了矩阵特征值分解,因而运算量降低。计算机仿真验证了方法的有效性。

A Fast DOA Estimation Method of Wideband Sources

A fast direction of arrival estimation method of wideband sources has been proposed.A new techniques is presented to compute the focusing matrix.It needs no direction pre-estimation or matrix eigendecomposition,so the focusing matrices are insensitive to the signals' direction and the computation is simple.Then,a set orthogonal bases of the covariance matrix in the krylov subspace is computed using the multistage weiner filter arithmetic.Under certain condition,the subspace spanned by the set of bases is equivalent to the signal subspace,so the spatial spectrum of wideband signals can be estimated.The whole estimation process avoids the rather expansive matrix eigendecomposition.The results of simulation support the effectiveness of the novel method.