文章摘要
李璇,鄢社锋.波达方向误差对对角加载波束形成的影响研究[J].声学技术,2008,(2):181~186
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
投稿时间:2007-02-06  修订日期:2007-06-12
DOI:
中文关键词: 对角加载  稳健自适应波束形成  波达方向不确定性  特征空间波束形成
英文关键词: diagonal loading  robust adaptive beamforming  DOA uncertainties  eigenspace-based beamforming
基金项目:国家自然科学基金(批准号60602055);中国科学院声学研究所所长择优基金(资助号GSOPSJJ02)
作者单位
李璇 中国科学院声学研究所数字系统集成部, 北京, 100080 
鄢社锋 中国科学院声学研究所数字系统集成部, 北京, 100080 
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中文摘要:
      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。
英文摘要:
      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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