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波达方向误差对对角加载波束形成的影响研究

A study of the effects of direction-of-arrival estimate errors on diagonal loading beamforming

  • 摘要: 文章回顾了对角加载波束形成理论的发展,列举了几种较常使用的求取对角加载因子的方法。通过多个仿真实例,着重分析了Xavier提出的基于无限随机矩阵理论的对角加载因子的方法,指出了其局限性-在期望信号的方向向量存在误差的时候,该方法产生自消现象,从而波束形成器的性能急剧下降。本文结合特征空间波束形成,根据期望信号的实际方向向量正交于噪声子空间,提出一种改进方法-先对期望信号的方向进行校正,再求取对角加载因子,从而加强了Xavier的方法对波达方向失配的稳健性。仿真实例验证了在信噪比不大的时候这个方法的有效性。

     

    Abstract: The development of diagonal loading beamforming technique is reviewed and some methods of computing diagonal loading factor are presented.Then,by simulation examples,the infinite-random-matrix-based beamforming presented by Xavier is analyzed.The result shows that the sell-nulling phenomenon happens in the scenario with steering vector errors to degrade the performance severely.Due to the orth-ogonality between the steering vector of the signal of interest(SOI) and the noise space,an improved method elicited by the eigenspace-based beamforming(ESB) is proposed,in which the direction of SOI is first calibrated.This method can improve the robustness of the beamformer in the case of Direction-of-Arrival(DOA) uncertainties.The result of the numerical simulation shows the effectiveness of this method when the SNR is not great.

     

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