基于波束空间的改进TOPS宽带DOA估计

提出了一种基于波束空间的改进投影子空间正交性测试算法,以克服投影子空间正交测试(Test of Orthogonality of Projected Subspace,TOPS)算法在低信噪比时容易出现伪峰的缺点。通过对TOPS算法中的正交性测试矩阵添加对角修正矩阵,并利用波束空间方法对阵元接收数据进行预处理,从而实现对宽带信号的波达方向估计。仿真结果表明,文中所提出算法与TOPS算法相比,能够抑制波束指向范围内的伪峰,并能提高分辨概率和减少运算量,是一种具有应用前景的新算法。

DOA estimation of wideband signals based on modified TOPS in beamspace domain

In this paper, a modified TOPS (test of orthogonality of projected subspace) algorithm based on beamspace, named BMTOPS algorithm, is proposed to overcome the shortcoming of TOPS algorithm that the false peak is easy to appear at low signal to noise ratio. A diagonal correction matrix is added to the orthogonality test matrix in the TOPS algorithm, and the beamspace method is applied to preprocessing the received data of the array, so as to achieve the DOA estimation of wideband signal. Simulation results show that compared with TOPS algorithm, BMTOPS algorithm can suppress false peaks in beam direction, improve resolution probability and reduce computation, which would be a new algorithm with application prospect.