一种宽带信号方位估计算法

为了削弱宽带信号方位估计算法在不同程度上受到阵元数目、预角度估计、多次求逆矩阵、多次特征值分解或奇异值分解等因素的制约,提出了一种在传感器阵列存在误差的情况下,采用统计方法的宽带信号方位估计算法.该算法先将传感器阵列接收的宽带信号转换到频率域内;在考虑阵列互耦的情况下,采用统计的方法,推导出阵列流形与噪声子空间正交的结论;最后,利用统计结果和窄带方位估计的方法对宽带信号进行方法估计.仿真试验表明,统计方法计算宽带信号方位具有较好的分辨率和噪声不敏感性,对于任意阵列形式具较低的计算复杂度.采用统计方法求取宽带信号方位具有较高的测向精度和和系统鲁棒性.

An algorithm of direction of arrival estimation for wideband signal

In order to reduce the restriction of the number of elements, preliminary angle estimation, large numbers of inverse matrix operation, eigendecomposition (ED) or singular value decompositions (SVD) in many algorithms of wideband signal direction of arrival, a new wideband signal direction-of-arrival estimation algorithm based statistics method is proposed in the presence of the mutual coupling between array elements. In this algorithm, the received wideband signal was transformed into the frequency domain. Then, an orthogonal conclusion between the array manifold and the noise subspace was derived by the statistics method in the condition of mutual coupling. And the direction-of-arrival of the wideband signals were estimated by the result of statistics method and the narrow estimation method. The simulation results illustrate that the algorithm has good estimation precision, noise nonsensitivity and low computational complexity. The proposed direction-of-arrival estimation algorithm based statistics method has high resolution and system stability.