基于斜投影的DOA估计和盲信号识别协同算法

阵列信号处理领域中,经常需要分析阵列接收信号的波达方向(DOA)和波形信息。在缺乏信号先验DOA和波形信息的情况下,提出了一种新的斜投影DOA估计和盲信号识别协同算法,实现对未知阵列接收信号的自适应分析。该算法交替地采用斜投影空域滤波技术将阵列接收信号拆分为单信号群组,在每个单信号群组内进行DOA和波形联合估计。算法适用于主瓣干扰存在的情况,并且在中小快拍数下有较好的估计性能。理论分析和仿真实验证实了文中算法的有效性。

Oblique Projection Based Collaborative Algorithm for DOA

Both direction of arrival (DOA) and waveform of array receiving signals are necessary to be analyzed in the field of array signal processing. In this paper, a novel oblique projection based collaborative algorithm for DOA estimation and blind signal identification is proposed to adaptively analyze unknown array receiving signals without knowing a priori DOA or waveform parameters. The proposed algorithm alternately uses oblique projection spatial filtering technique to separate mixed array receiving signals into separated single signal groups. In each signal group, both DOA estimation and waveform identification are implemented. The proposed algorithm exhibits excellent estimation performance with moderate to low snapshots and is applicable to the cases where exists main lobe interference. Both theoretical analysis and simulation result verify the effectiveness of the proposed algorithm.