文章摘要
夏云龙,付永庆.时间反转镜DOA-AT成像算法[J].声学技术,2007,(5):907~909
时间反转镜DOA-AT成像算法
DOA-AT imaging algorithm based on time reversal mirror
投稿时间:2007-01-20  修订日期:2007-03-16
DOI:
中文关键词: 时间反转镜  时间反转理论  奇异值分解  DOA估计
英文关键词: time reversal mirror  time-reversal theory  singular value decomposition  DOA estimation
基金项目:
作者单位E-mail
夏云龙 哈尔滨工程大学信息与通信工程学院, 哈尔滨, 150001 xyl7566@126.com 
付永庆 哈尔滨工程大学信息与通信工程学院, 哈尔滨, 150001  
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中文摘要:
      超声成像中广泛应用的DOA算法容易受到介质的不均匀性和多途效应的影响,纵坐标分辨率较差。在时间反转法理论的基础上,提出在随机媒质中采用时间反转镜超声成像的DOA-AT新算法。新算法通过对散射中接收信号的到达时间和响应矩阵频域奇异值进行分解,将时域内目标函数DOA估计与到达时间估计结合起来,使成像目标的纵坐标估计得到明显改善,对目标检测能力增强。
英文摘要:
      DOA algorithm widely used in ultrasonic imaging is susceptible to the inhomogeneity and multi-path of the medium. Therefore,the range resolution is poor. Based on time-reversal method,a new imaging algorithm motivated by time-reversal mirror in random medium is proposed. The new DOA-AT imaging algorithm performs as the following steps: (i) Arrival time analysis of the received echo from the scatters; (ii) Singular value decomposition of the array response matrix in frequency domain; (iii) Combination of the DOA estimation of target function in time domain and the Arrival Time estimation that results in DOA-AT estimation algorithm.
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