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| 论文题目 |
波达方向误差对对角加载波束形成的影响 |
| 论文题目（英文） |
The effects analysis of direction-of-arrival estimate errors on diagonal loading beamforming |
| 作者 |
李璇 |
| 发表年度 |
2008 |
| 卷 |
27 |
| 期 |
2 |
| 页码 |
181-186 |
| 期刊名称 |
声学技术 |
| 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。
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 |
| 摘要_英文 |
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-matrixbased 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 orthogonality 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.
Key words : diagonal loading; robust adaptive beamforming; DOA uncertainties; eigenspace-based
beamforming |
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