| 谌颖,叶青华,黄海宁.采用分级聚焦波束形成的快速声成像算法[J].,2008,27(3):207-211 |
| 采用分级聚焦波束形成的快速声成像算法 |
| A Fast Imaging Algorithm Using Multistage-Focusing Beamforming |
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| 中文摘要: |
| 为了减小常规波束形成所需的庞大计算量以实现快速成像,本文提出了一种新的波束形成算法——分级聚焦波束形成。将基阵划分成各级子阵分级进行处理,对较短的子阵进行远场近似处理,逐级合并子阵进行子阵间的近场聚焦波束形成,并逐级进行波束插值。MAT- LAB仿真计算结果表明,分级聚焦法与常规波束形成相比,计算量和数据存储量大幅下降。该方法尤其适用于多焦点近场聚焦的场合。 |
| 英文摘要: |
| In order to reduce the huge computational task of conventional delay-sum beamforming so as to implement fast imaging,this paper describes a new algorithm of beamforming——multistage-focusing beamforming.The array is divided into subarrays and multistage processing is implemented.Conventional far-field beam- forming is done for these short subarrays.At successive stages the near-field beams for pairs of subarrays are combined and additional beams are developed.The simula- tion results using MATLAB demonstrate that the multistage-focusing beamforming shows great savings in the computational load and the data storage compared with the conventional beamforming.This method is especially fit for the situation of mul- tifocus focusing in the near field. |
| DOI：10.11684/j.issn.1000-310X.2008.03.008 |
| 中文关键词: 声成像 分级聚焦 近场聚焦 波束形成 |
| 英文关键词: Acoustic imaging Multistage focusing Near-field focusing Beamforming |
| 基金项目:国家自然科学基金(No．60602054) |
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