宽带信号源数目和DOA快速估计

A New Method for Fast Estimation on the Number and DOA of Wideband Sources

宽带信号源数目估计与其波达方向（DOA）估计是紧密相连的。文章综合考虑信号源数目和DOA估计，从减少算法的运算量出发，提出了一种新的宽带信号源数目和DOA快速估计方法。该方法首先利用多级维纳滤波器（MSWF）算法来估计信号子空间，避免了特征分解方法估计信号子空间所需要的大运算量；然后基于信号子空间的旋转不变性，提出了一种新的宽带信号源数目估计快速算法；最后利用信号子空间的旋转不变性来估计DOA，避免了谱峰搜索所需要的大运算量。计算机仿真试验验证了此方法的有效性。

Estimation on the number of wideband sources is associated with the estimation of DOA （direction of arrival）. In order to reduce the complexity of calculation and considering the number of sources and DOA estimation, a new method for fast estimation on the number and DOA of wideband sources is proposed in this paper. In this method, firstly, the signal subspace is estimated by multistage Wiener filter （MSWF） algorithm which avoids computationally intensive eigen-decomposition. Then, based on the rotational invariance property between two identical subspace, a novel method to estimate the number of wideband sources is proposed. Finally, DOA is estimated by the rotational invariance property, thus, the method eliminates the search over parameter space which is computationally very expensive. The computer simulations show the availability of the method.