文章摘要
苏帅,冯杰,孙超.空域预滤波的稳健自适应波束形成方法[J].声学技术,2008,(1):9~13
空域预滤波的稳健自适应波束形成方法
Robust adaptive beamforming based on space prefilter
投稿时间:2007-02-05  修订日期:2007-06-25
DOI:
中文关键词: 空域矩阵滤波  稳健  自适应波束形成  系统误差
英文关键词: spatial matrix filter  robust adaptive beamforming  system errors
基金项目:西北工业大学研究生创业种子基金(Z200704)
作者单位E-mail
苏帅 西北工业大学航海学院声学工程研究所, 西安, 710072 solomonsu.mail@gmail.com 
冯杰 中国电子工业集团第三研究所, 北京, 100101  
孙超 西北工业大学航海学院声学工程研究所, 西安, 710072  
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中文摘要:
      假定的期望信号方向向量与真实信号方向向量存在误差时,常规自适应波束形成性能将严重降低,针对该问题,提出了一种稳健的自适应波束形成算法。首先利用凹槽空域矩阵滤波器对基阵接收数据进行空域预滤波,消除协方差矩阵中的期望信号分量,然后重构协方差矩阵同时反变换到阵元域,再用重构的协方差矩阵形成自适应波束权向量。由于方法消除了期望信号分量的影响,极大地提高了自适应波束形成算法对系统误差的稳健性。计算机仿真验证了所提方法的有效性。
英文摘要:
      Traditional adaptive beamformer suffers from performance degradation in the presence of mismatch between actual and assumed array steering vectors of the desired signal.A novel approach to adaptive beamformer is proposed,which emphasizes the robustness to the system errors.Firstly,the desired signal component is attenuated from input snapshot data by spatial matrix filter;then the covariance matrix is reconstructed by using the filtered snapshot data and transformed back to element level data prior to performing adaptive beamforming;finally,the weights of the adaptive beamformer are computed using transformed covariance matrix.The method overcomes the desired signal cancellation problem of adaptive beamformer caused by system errors because the desired signal component is attenuated by spatial matrix filter.Therefore,the robustness of adaptive beamformer against the system errors is greatly improved.Computer simulation results prove its validity and superiority to the existing methods.
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