文章摘要
高洁,侯卫民,刘云涛,蔡惠智.一种自适应的主动声呐直达波干扰抑制算法[J].声学技术,2008,(3):418~422
一种自适应的主动声呐直达波干扰抑制算法
An adaptive algorithm of direct path interference suppression for active sonar detection
投稿时间:2007-07-08  修订日期:2007-09-24
DOI:
中文关键词: 主动声呐  直达波干扰  频域分块自适应滤波  最小均方算法  匹配相关
英文关键词: active sonar  direct path intefference(DPI)  frequency-domain adaptive filtering(FDAF)  Least Mean Square(LMS)  replica correlator
基金项目:
作者单位E-mail
高洁 中国科学院声学研究所, 北京, 100080
中国科学院研究生院, 北京, 100039 
gaojie1979@mail.com 
侯卫民 中国科学院声学研究所, 北京, 100080
中国科学院研究生院, 北京, 100039 
 
刘云涛 中国科学院声学研究所, 北京, 100080  
蔡惠智 中国科学院声学研究所, 北京, 100080  
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中文摘要:
      为了克服主动声呐编队作战条件下的直达波干扰,达到检测微弱目标回波信号的目的,提出了一种基于频域分块自适应滤波算法的直达波抑制方法。这种方法将自适应滤波理论和匹配相关技术相结合,首先对接收数据做频城分块自适应滤波,再利用已知发射信号副本进行匹配相关,最后提取目标回波信号。其中,频域分块自适应滤波算法相比基本最小均方算法,计算复杂度降低,收敛速度快,基本保证了主动声呐每个探测周期内的直达波抑制和目标回波的提取。通过数值仿真实验表明:在强直达波干扰存在条件下,该算法对目标回波的提取在精度和鲁棒性等方面均优于以往的直接匹配相关方法。
英文摘要:
      In order to eliminate direct path interference(DPI)between active sonars in navy battle formation and to detect weak echoes from underwater targets, an adaptive algorithm based on frequency-domain adaptive filtering(FDAF)to depress DPI is proposed in this paper.The algorithm combines adaptive tiltering and replica correlator(or matched filter processing)technology. First, the novel frequency-domain adaptive filtering to the data that come from the receiver array is applied. Secondly, the output of adaptive filtering is correlated with a replica of the transmitted pulse. Finally, the target echo is extracted and DPI is eliminated. Compared with basic LMS algorithm, the new FDAF algorithm with variable step-size factor leads to a considerable reduction in computational complexity, and improves the convergence rate and basically ensures the DPI suppression and the extraction of target echo during a ping of an active sonar transmission Numerical experiments prove that the proposed algorithm is superior to the conventional method in the presence of strong DPI,especially in some aspects such as accuracy and robnstness of target echo extraction.
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