一种改进的宽带DOA估计算法

Modified Estimation Algorithm for Wideband DOA

针对现有宽带相干信号源DOA估计算法(CSM)存在依赖于初始值的选取以及需要先验信息等缺陷,提出一种改进算法——自聚焦算法.通过建立均匀线阵以及十字阵模型,推导了自聚焦算法,证明了自相关矩阵为正定时聚焦矩阵是一个酉矩阵,不会产生任何的聚焦损失.最后对自聚焦算法和CSM算法进行了仿真.仿真结果验证了自聚焦算法的有效性;与CSM算法相比,自聚焦算法可以有效解决相干信号源的问题,具有更好的鲁棒性.

In this paper,an improved algorithm,namely autofocus algorithm is presented,by aiming at the flaws that the available estimation algorithms for the DOA of wideband coherent signal source rely on the selection of initial value and require for the priori information,etc.The autofocus algorithm is derived by constructing the models of uniform linear array（ULA） and cross array.And it is proved that the focus matrix is a unitary matrix when the autocorrelation matrix is positive definite,producing no focusing loss.Finally,simulation is performed for the autofocus and CSM algorithms,and it is shown that the autofocus algorithm is of availability,which can effectively solve for the problems of coherent signal source and be of much better robustness.