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Sensors 2018, 18(5), 1582;

Three-Dimensional Terahertz Coded-Aperture Imaging Based on Geometric Measures

School of Electronic Science, National University of Defense Technology, Changsha 410073, China
Authors to whom correspondence should be addressed.
Received: 11 April 2018 / Revised: 10 May 2018 / Accepted: 13 May 2018 / Published: 16 May 2018
(This article belongs to the Section Remote Sensors)
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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. View Full-Text
Keywords: coded-aperture imaging; three-dimensional (3D); geometric measures (GMs); pulse compression coded-aperture imaging; three-dimensional (3D); geometric measures (GMs); pulse compression

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Chen, S.; Hua, X.; Wang, H.; Luo, C.; Cheng, Y.; Deng, B. Three-Dimensional Terahertz Coded-Aperture Imaging Based on Geometric Measures. Sensors 2018, 18, 1582.

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