摘要
针对期望信号假定导向矢量与真实导向矢量存在误差时,常规自适应波束形成将有较大的性能损失,提出了一种稳健的自适应波束形成算法来克服这种误差敏感性。该方法分两步完成,首先估计出实际的导向矢量,然后再用该估计结果求出最优权。通过Lagrange乘子法得到简单的闭式解,它不属于对角加载系列的方法,因而不存在加载量的确定这一问题。最后通过计算机仿真验证了所提方法的有效性与优越性。
Traditional adaptive beamformer suffers performance degradation in the presence of mismatches between the actual and presumed array steering vectors of the desired signal. A novel approach to adaptive beamformer is proposed, which emphasizes the robustness to the system errors. The beamforrner is accomplished by two steps, estimating the actual steering vector firstly, and computing the optimal weight by utilizing the estimated steering vector. Simple closed-form solution to this robust beamformer problem is obtained by using Lagrange approach. Since the proposed method doesn＇ t belong to the class of diagonal loading, it overcomes the uncertainty in determining the optimal loading level. Finally, computer simulation results demonstrate its validity and superiority to the methods available.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2005年第10期1669-1672,共4页
Systems Engineering and Electronics
基金
国家自然科学基金资助课题(60472097)
关键词
阵列信号
稳健波束形成
阵列误差
array signal processing
robust Capon beamforming
array errors
