Three-Dimensional Terahertz Coded-Aperture Imaging Based on Geometric Measures
For synthetic aperture radars, it is difficult to achieve forward-looking and staring imaging with high resolution. Fortunately, terahertz coded-aperture imaging (TCAI), an advanced radar imaging technology, can solve this problem by producing various irradiation patterns with coded apertures. Howev...
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MDPI AG
2018-05-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/18/5/1582 |
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| author | Shuo Chen Xiaoqiang Hua Hongqiang Wang Chenggao Luo Yongqiang Cheng Bin Deng |
| author_facet | Shuo Chen Xiaoqiang Hua Hongqiang Wang Chenggao Luo Yongqiang Cheng Bin Deng |
| author_sort | Shuo Chen |
| collection | DOAJ |
| description | For synthetic aperture radars, it is difficult to achieve forward-looking and staring imaging with high resolution. Fortunately, terahertz coded-aperture imaging (TCAI), an advanced radar imaging technology, can solve this problem by producing various irradiation patterns with coded apertures. However, three-dimensional (3D) TCAI has two problems, including a heavy computational burden caused by a large-scale reference signal matrix, and poor resolving ability at low signal-to-noise ratios (SNRs). This paper proposes a 3D imaging method based on geometric measures (GMs), which can reduce the computational burden and achieve high-resolution imaging for low SNR targets. At extremely low SNRs, it is difficult to detect the range cells containing scattering information with an ordinary range profile. However, this difficulty can be overcome through GMs, which can enhance the useful signal and restrain the noise. By extracting useful data from the range profile, target information in different imaging cells can be simultaneously reconstructed. Thus, the computational complexity is distinctly reduced when the 3D image is obtained by combining reconstructed 2D imaging results. Based on the conventional TCAI (C-TCAI) model, we deduce and build a GM-based TCAI (GM-TCAI) model. Compared with C-TCAI, the experimental results demonstrate that GM-TCAI achieves a more impressive performance with regards to imaging ability and efficiency. Furthermore, GM-TCAI can be widely applied in close-range imaging fields, for instance, medical diagnosis, nondestructive detection, security screening, etc. |
| first_indexed | 2024-12-10T07:19:24Z |
| format | Article |
| id | doaj.art-939e5e84e0dd4933b5d24f09eec47894 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-12-10T07:19:24Z |
| publishDate | 2018-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-939e5e84e0dd4933b5d24f09eec478942022-12-22T01:57:52ZengMDPI AGSensors1424-82202018-05-01185158210.3390/s18051582s18051582Three-Dimensional Terahertz Coded-Aperture Imaging Based on Geometric MeasuresShuo Chen0Xiaoqiang Hua1Hongqiang Wang2Chenggao Luo3Yongqiang Cheng4Bin Deng5School of Electronic Science, National University of Defense Technology, Changsha 410073, ChinaSchool of Electronic Science, National University of Defense Technology, Changsha 410073, ChinaSchool of Electronic Science, National University of Defense Technology, Changsha 410073, ChinaSchool of Electronic Science, National University of Defense Technology, Changsha 410073, ChinaSchool of Electronic Science, National University of Defense Technology, Changsha 410073, ChinaSchool of Electronic Science, National University of Defense Technology, Changsha 410073, ChinaFor synthetic aperture radars, it is difficult to achieve forward-looking and staring imaging with high resolution. Fortunately, terahertz coded-aperture imaging (TCAI), an advanced radar imaging technology, can solve this problem by producing various irradiation patterns with coded apertures. However, three-dimensional (3D) TCAI has two problems, including a heavy computational burden caused by a large-scale reference signal matrix, and poor resolving ability at low signal-to-noise ratios (SNRs). This paper proposes a 3D imaging method based on geometric measures (GMs), which can reduce the computational burden and achieve high-resolution imaging for low SNR targets. At extremely low SNRs, it is difficult to detect the range cells containing scattering information with an ordinary range profile. However, this difficulty can be overcome through GMs, which can enhance the useful signal and restrain the noise. By extracting useful data from the range profile, target information in different imaging cells can be simultaneously reconstructed. Thus, the computational complexity is distinctly reduced when the 3D image is obtained by combining reconstructed 2D imaging results. Based on the conventional TCAI (C-TCAI) model, we deduce and build a GM-based TCAI (GM-TCAI) model. Compared with C-TCAI, the experimental results demonstrate that GM-TCAI achieves a more impressive performance with regards to imaging ability and efficiency. Furthermore, GM-TCAI can be widely applied in close-range imaging fields, for instance, medical diagnosis, nondestructive detection, security screening, etc.http://www.mdpi.com/1424-8220/18/5/1582coded-aperture imagingthree-dimensional (3D)geometric measures (GMs)pulse compression |
| spellingShingle | Shuo Chen Xiaoqiang Hua Hongqiang Wang Chenggao Luo Yongqiang Cheng Bin Deng Three-Dimensional Terahertz Coded-Aperture Imaging Based on Geometric Measures Sensors coded-aperture imaging three-dimensional (3D) geometric measures (GMs) pulse compression |
| title | Three-Dimensional Terahertz Coded-Aperture Imaging Based on Geometric Measures |
| title_full | Three-Dimensional Terahertz Coded-Aperture Imaging Based on Geometric Measures |
| title_fullStr | Three-Dimensional Terahertz Coded-Aperture Imaging Based on Geometric Measures |
| title_full_unstemmed | Three-Dimensional Terahertz Coded-Aperture Imaging Based on Geometric Measures |
| title_short | Three-Dimensional Terahertz Coded-Aperture Imaging Based on Geometric Measures |
| title_sort | three dimensional terahertz coded aperture imaging based on geometric measures |
| topic | coded-aperture imaging three-dimensional (3D) geometric measures (GMs) pulse compression |
| url | http://www.mdpi.com/1424-8220/18/5/1582 |
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