文章摘要
张大海,杨坤德.基于协方差矩阵加权的任意阵列宽带恒定束宽波束形成方法[J].声学技术,2008,(3):439~445
基于协方差矩阵加权的任意阵列宽带恒定束宽波束形成方法
Broadband constant beamwidth beamforming based on covariance matrix weighting method
投稿时间:2007-06-14  修订日期:2007-08-05
DOI:
中文关键词: 协方差矩阵加权  恒定束宽  波束优化
英文关键词: covariance matrix weighting  constant beamwidth  beam optimization
基金项目:国家自然科学基金(60472073);陕西省自然科学基础研究计划(2005F40)。
作者单位E-mail
张大海 西北工业大学声学工程研究所, 西安, 710072 zdh_hyj@mail.nwpu.edu.cn 
杨坤德 西北工业大学声学工程研究所, 西安, 710072  
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中文摘要:
      提出了基于协方差矩阵加权方法的恒定束宽波束形成方法,它适用于任意几何形状和阵元方向性的传感器阵列。设计方法为:首先将设计频带分成若干子带,采用优化方法,通过对各子带波束施加约束,设计出具有设定波束形状的各子带波束。然后,对各子带波束进行能量综合,完成宽带信号处理。该方法解决了协方差矩阵加权波束形成方法在宽带系统中会出现的频谱畸变问题,提高了其宽带信号处理性能,为此类的宽带系统设计提供了理论支持。通过计算机仿真和湖试实验数据验证了方法的正确性。
英文摘要:
      A new approach to broadband constant beamwidth beamforming based on Covariance matrix weighting beamforming(CMW)is proposed. Firstly, the working frequency band is divided into a number of narrowband frequency bins,and the covariance weighting matrixes for each frequency bin are deduced using beampattern opthulzation method. With the covariance matrixes, beams of deferent frequencies are same as the reference beam.Subsequently, broadband signals processing is accomplished through syntbe-sizing each frequency bin. This approach solves the problem of distorted signal spectra, improves the performance of the second order statistical methods in broadband system. Computer simulation and lake trials prove the correctness of the proposed method.
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