一种宽带信号方位估计算法

针对多种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,文章提出了一种在传感器阵列存在误差的情况下,基于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,并考虑在阵列互耦的情况下,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,统计方法具有较好的方位角分辨率、噪声不敏感性和较低的计算复杂度.

An Estimation Algorithm for the Arrival Direction of Wideband Signal

Due to restricted by the number of elements,preliminary angle estimation,large numbers of inverse matrix operation,eigendecomposition (ED) or singular value decompositions(SVD) in many algorithms for the direction-of-arrival of wide band signal,a new wideband signal direction-of-arrival estimation algorithm based statistics method was introduced in the presence of the mutual coupling between array elements.In this algorithm,the received wideband signal was transformed into frequency domain.Then,the orthogonal conclusion between array manifold and noise subspace was derived by statistics method in the condition of the mutual coupling.Finally,the direction-of-arrival of the wideband signals was estimated by the result of statistics method and narrow estimation method.The computer simulation results illustrated that the algorithm had good estimation precision,noise non-sensitivity and low computational complexity.