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) |
|
摘要点击次数: 1158 |
全文下载次数: 1310 |
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. |
查看全文
查看/发表评论 下载PDF阅读器 |
关闭 |
|
|
|