Accurate Near-Field Millimeter-Wave Imaging of Concave Objects—A Case Study of Dihedral Structures Under Monostatic Array Configurations
Accurate Near-Field Millimeter-Wave Imaging of Concave Objects—A Case Study of Dihedral Structures Under Monostatic Array Configurations
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凹面物体的精确近场毫米波成像——单站阵列配置下二面体结构的案例研究
DOI：
10.1109/tgrs.2019.2957315
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发表时间：
2020-05
影响因子：
8.2
通讯作者：
Jungang Miao
中科院分区：
文献类型：
--
作者：
Bingyuan Liang;Xiaozhou Shang;Xiaodong Zhuge;Jungang Miao
随着高分辨率微波和毫米波（MMW）近场成像系统的快速发展，复杂高对比度目标引起的图像伪影成为精确表面重建和识别中不可忽视的问题。在不同类型的伪影中，由凹结构内的高阶散射引起的伪影特别难以解释和纠正。本文重点分析传统成像或波束形成算法中这些未考虑的影响，并选择近场单站柱面成像几何结构下具有二面体结构的典型成像场景进行讨论。首先研究了多次反射的机制和伪影的形成，并根据反射次数将伪影分为两类。然后利用射击和弹跳射线（SBR）方法建立了包含多次反射机制的解析正演模型。此外，提出了一种基于该正演模型的新成像算法以获得更准确的重建。通过用相应的距离方程补偿不同多次反射信号的相移，可以精确地恢复具有不同张角的二面体类型物体。数值结果验证了正演模型的适用性并验证了所提出的成像算法的有效性。最后，实验结果证实了该方法的实用性。
With the fast progress of high-resolution microwave and millimeter-wave (MMW) near-field imaging systems, image artifacts caused by complex high-contrast target become a nonnegligible issue for accurate surface reconstruction and recognition. Among different types of artifacts, those caused by high-order scattering within concave structures are particularly difficult to interpret and to correct. This article focuses on analyzing these unconsidered effects in conventional imaging or beamforming algorithms and chooses a typical imaging scenario with dihedral structures under near-field monostatic cylindrical imaging geometry for discussion. The mechanism of multiple reflections and the formation of artifacts are firstly investigated, and the artifacts are classified into two categories based on the number of reflection times. Then shooting and bouncing rays (SBRs) method is utilized to establish an analytical forward model including the mechanism of multiple reflections. Furthermore, a new imaging algorithm based on this forward model is proposed to obtain more accurate reconstructions. By compensating phase shifts of different multiple reflection signals with the corresponding range equations, dihedral-type objects with different opening angles can be accurately recovered. Numerical results are presented to verify the applicability of the forward model and to validate the effectiveness of the proposed imaging algorithm. In the end, experimental results confirm the practicability of the proposed method.
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DOI：
10.1007/bf02846778
发表时间：
1991-12
期刊：
Pramana
影响因子：
--
作者：
P. B. S. Kumar;G. Ranganath
通讯作者：
P. B. S. Kumar;G. Ranganath
DOI：
10.1049/pbew037e
发表时间：
1994-06
期刊：
--
影响因子：
--
作者：
V. Borovikov;B. Kinber
通讯作者：
V. Borovikov;B. Kinber
DOI：
10.1109/icton.2015.7193459
发表时间：
2015-07
期刊：
2015 17th International Conference on Transparent Optical Networks (ICTON)
影响因子：
--
作者：
K. Gaikovich
通讯作者：
K. Gaikovich
影响因子：
10.6
作者：
X. Zhuge;W. J. Palenstijn;K. Batenburg
通讯作者：
X. Zhuge;W. J. Palenstijn;K. Batenburg
影响因子：
8.2
作者：
S. Kidera;T. Sakamoto;Toru Sato
通讯作者：
S. Kidera;T. Sakamoto;Toru Sato