基于归一化CRB加权的宽带DOA估计方法

摘要

针对宽带信号频域波达方向(direction of arrivals,DOA)估计方法在各子频带能量存在差异时性能下降的问题,提出一种基于归一化克拉美-罗界(Cramer-Rao bound, CRB)加权宽带DOA估计方法.首先在各子频带分别计算DOA估计值,然后根据信号在各子频带的归一化克拉美罗界值,对相应子频带的DOA估计值进行加权,从而提高DOA估计精度以及分辨率.仿真实验验证了所提方法的有效性.%In order to make full use of the wideband signal information to get efficient direction of arrival (DOA) estimation, a weighed wideband DOA estimation method based on normalized Cramer-Rao bound (CRB) is proposed.Firstly, it estimates the DOA in different frequency bands.Then, the result of DOA is given by weighing the DOA in different frequency bands.The weight is calculated according to the normalized CRB value.The proposed method improves the estimation accuracy and resolution of DOA.Simulation results show the validity of the method.