文章摘要
张保嵩,马远良.宽带恒定束宽波束形成器的设计与实现[J].,1999,18(5):29-33
宽带恒定束宽波束形成器的设计与实现
Beamformer for broadband constant beamwidth through FIR and DSP implementation
  
中文摘要:
      本文提出了一种设计宽带恒定束宽波束形成器的方法.这对应用于海底探测和分类问题的声纳系统来说是十分重要的.对于给定频带宽度的信号,选择一定数量的频率点来表达其频率响应.对于一个给定的频点,可以通过现有方法导出满足恒定束宽要求的加权矢量,例如对于一个线列阵,可用切比雪夫多项式得到其加权矢量.因此对于一个具有N个阵元的宽带阵,如果选择M个频率点,可以得到一个N·M的加权矩阵.这个矩阵的每一行代表一个阵元的频率响应,而这个频率响应可以由采用模型参考自适应方法设计的FIR滤波器来实现.这样一组N个FIR滤波器的输出之和就是波束形成的输出,它可以很方便地通过DSP硬件来实现.本文给出了一个使用这种方法设计的例子,结果是令人满意的。
英文摘要:
      The paper presents a method to design a beamformer for broadband constant beamwidth. Such a beamformer is important in sonar systems for sea bottom observa- tion and classification applications. For a given frequency band, a number of frequency points are chosen to represent the response. For each frequency point a beamforming weighting vector can be deduced to satisfy a given beamwidth requirement by existing methods, for example the Chebyshev shielding coefficients can be deduced for a linear array. Therefore, for a broadband array of N elements and for M chosen frequency points, a N’M weighting matrix in which each row represents a frequency response of an array element, which can be satisfied by a FIR filter designed by the model-reference adaptive technique. The sum of outputs from a bank of N FIR filters provides a beamformed output and so it is very handy to be implemented by DSP hardware. A design example shows that the results are satisfactory.
DOI:10.11684/j.issn.1000-310X.1999.05.007
中文关键词: 宽带恒定束宽波束形成器  FIR滤波器  模型参考自适应方法
英文关键词: Beamformer for broadband constant beamwidth  FIR filter  Model-reference adaptive technique
基金项目:
作者单位
张保嵩 西北工业大学声学工程研究所!西安710072 
马远良 西北工业大学声学工程研究所!西安710072 
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