冲击噪声背景下相干信号源的DOA估计方法

摘要

A method called FLOM-TDD(Fractional Lower Order Moment Time Delay Decorrelation) is proposed to estimate the DOA(direction of arrival) of coherent sources in the presence of impulsive noise.Firstly,the generalized steering vector is obtained by DOA matrix method based on two fractional lower order moment matrices with different time delays.Secondly,the DOA of each group of coherent sources is estimated according to the multipath attenuation characteristics by temporal smoothing.This method performs well in the impulsive noise environment and can estimate the coherent sources with the number more than array sensors.Computer simulations prove the effectivity of the proposed method.%针对冲击噪声背景下相干信号源的波达方向(Direction of Arrival,DOA)估计问题,提出一种基于时延分数低阶矩的分组解相干算法-FLOM-TDD(Fractional Lower Order Moment Time Delay Decorrelation).首先基于两个时延不同的分数低阶矩矩阵,利用DOA矩阵方法得到每组相干源的广义导向矢量;然后根据多径衰减的特征,对每组相干源进行时域解相干,得到相干源的波达方向估计.该方法适用于冲击噪声背景下的波达方向估计而且可以估计大于阵元数目的相干源,计算机仿真分析验证了算法的性能优势.