| 一种用于人体安检的三维稀疏太赫兹快速成像算法 |
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| 引用本文： | 刘玮,李超,张群英,方广有. 一种用于人体安检的三维稀疏太赫兹快速成像算法[J]. 雷达学报, 2016, 5(3): 271-277. DOI: 10.12000/JR15116 |
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| 作者姓名： | 刘玮 李超 张群英 方广有 |
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| 作者单位： | 1.(中国科学院电磁辐射与探测技术重点实验室 北京 100190)2.(中国科学院大学 北京 100039) |
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| 基金项目： | 中国科学院知识创新工程项目(YYYJ-1123)国家863计划(2012AA121901),国家自然科学基金(11174280) |
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| 摘 要： | 太赫兹全息成像技术在人体安检成像、隐匿武器检测、无损检测等领域具有广阔的应用前景。该文提出了一种能够避免产生距离混叠现象的3维稀疏太赫兹快速成像体制和成像算法。该方法通过对太赫兹雷达的3维成像几何及相应回波模型的分析,利用随机稀疏频点数据来有效消除距离混叠现象;同时利用对稀疏回波数据的频谱搬移和插值来获得包含目标完整信息的3维数据,以实现对目标的3维分辨成像。通过对0.2 THz波段的仿真和实验数据的重建,验证了算法的正确性和有效性。
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| 关 键 词： | 太赫兹全息成像 快速稀疏成像 人体安检 |
| 收稿时间： | 2015-11-04 |
Fast Three-dimensional Sparse Holography Imaging Algorithm for Personal Security Verification |
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| Liu Wei,Li Chao,Zhang Qunying,Fang Guangyou. Fast Three-dimensional Sparse Holography Imaging Algorithm for Personal Security Verification[J]. Journal of Radars, 2016, 5(3): 271-277. DOI: 10.12000/JR15116 |
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| Authors: | Liu Wei Li Chao Zhang Qunying Fang Guangyou |
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| Affiliation: | 1.(Key Laboratory of Electromagnetic Radiation and Sensing Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China)2.(University of Chinese Academy of Sciences, Beijing 100039, China) |
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| Abstract: | Terahertz holographic imaging has broad applications in the field of personal security verification, concealed weapon detection, and non-destructive testing. To suppress the range ambiguity, a fast sparse image reconstruction approach and imaging scheme is proposed for three-dimensional terahertz holography. The proposed algorithm establishes the terahertz imaging geometry and corresponding echo model. The range ambiguity is eliminated using the random step frequency method, and a frequency shift procedure is applied to recover the targets with a high computational efficiency. Simulation and experimental results verify the proposed algorithm. |
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