| 宽带扩展性目标时反算子分解成像 |
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| 引用本文： | 李春晓, 郭明飞, 王忠康. 宽带扩展性目标时反算子分解成像[J]. 声学学报, 2018, 43(2): 145-153. DOI: 10.15949/j.cnki.0371-0025.2018.02.003 |
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| 作者姓名： | 李春晓 郭明飞 王忠康 |
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| 作者单位： | 1. 浙江工业大学 机械工程学院 特种装备制造与先进加工技术教育部/浙江省重点实验室 杭州 310014; |
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| 基金项目： | 国家自然科学基金项目(61101231)浙江省科技厅公益性项目(2013C31003)浙江省自然科学基金项目(Y1100629)资助 |
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| 摘 要： | 在时反算子分解技术的基础上,提出了宽带全信号子空间加权成像方法。虽然扩展性目标与时反算子的特征向量不再是一一对应关系,传统的时反选择性聚焦仍然选择某一特定的信号子空间成像,而时反MUSIC只利用某一频点成像,导致定位结果背景起伏较高。为克服这些缺陷,利用时反算子的特征值判断信号子空间的个数,以广义散射系数为加权系数,实现全宽带和全信号子空间成像。结果表明,此方法的旁瓣水平明显下降。
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| 关 键 词： | 时间反转 扩展性目标 目标成像 浅海波导 广义散射系数 |
| 收稿时间： | 2017-03-22 |
| 修稿时间： | 2017-08-01 |
Wideband imaging of extended targets with the decomposition of the time reversal operator |
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| LI Chunxiao, GUO Mingfei, WANG Zhongkang. Wideband imaging of extended targets with the decomposition of the time reversal operator[J]. ACTA ACUSTICA, 2018, 43(2): 145-153. DOI: 10.15949/j.cnki.0371-0025.2018.02.003 |
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| Authors: | LI Chunxiao GUO Mingfei WANG Zhongkang |
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| Affiliation: | 1. MOE/Zhejiang Provincial Key Laboratory of Special Purpose Equipment and Advanced Manufacturing Technology, College of Mechanical Engineering Hangzhou 310014;2. National Key Laboratory of Science and Technology on Sonar, Hangzhou Applied Acoustics Research Institute Hangzhou 310023 |
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| Abstract: | The weighted wideband imaging approach of full signal subspaces is proposed based on the decomposition of the time reversal operator(DORT). Although each singular vector of nonzero singular values does not correspond to one of the extended targets any more, the conventional approach of selective time reversal focusing still chooses one of the signal subspaces for imaging. Simultaneously, the time-reversal MUSIC imaging is carried out at a single frequency for wideband signal. The imaging of both methods has a high background fluctuation. In order to overcome these drawbacks, the number of signal subspaces is determined by the singular values of the time reversal operator, and then DORT imaging of full signal subspaces and entire bandwidth is achieved using the generalized reflectivity coefficients as the weighted parameters. The experimental result shows that the sidelobe level of this approach is extremely decreased. |
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| Keywords: | Time reversal Extended target Target imaging Shallow water environments generalized reflectivity coefficient |
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