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Sensors 2018, 18(1), 303;

Three-Dimensional Terahertz Coded-Aperture Imaging Based on Single Input Multiple Output Technology

School of Electronic Science, National University of Defense Technology, Changsha 410073, China
Authors to whom correspondence should be addressed.
Received: 15 December 2017 / Revised: 17 January 2018 / Accepted: 18 January 2018 / Published: 19 January 2018
(This article belongs to the Section Remote Sensors)
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As a promising radar imaging technique, terahertz coded-aperture imaging (TCAI) can achieve high-resolution, forward-looking, and staring imaging by producing spatiotemporal independent signals with coded apertures. In this paper, we propose a three-dimensional (3D) TCAI architecture based on single input multiple output (SIMO) technology, which can reduce the coding and sampling times sharply. The coded aperture applied in the proposed TCAI architecture loads either purposive or random phase modulation factor. In the transmitting process, the purposive phase modulation factor drives the terahertz beam to scan the divided 3D imaging cells. In the receiving process, the random phase modulation factor is adopted to modulate the terahertz wave to be spatiotemporally independent for high resolution. Considering human-scale targets, images of each 3D imaging cell are reconstructed one by one to decompose the global computational complexity, and then are synthesized together to obtain the complete high-resolution image. As for each imaging cell, the multi-resolution imaging method helps to reduce the computational burden on a large-scale reference-signal matrix. The experimental results demonstrate that the proposed architecture can achieve high-resolution imaging with much less time for 3D targets and has great potential in applications such as security screening, nondestructive detection, medical diagnosis, etc. View Full-Text
Keywords: coded-aperture imaging; terahertz; three-dimensional (3D); single input multiple output (SIMO) coded-aperture imaging; terahertz; three-dimensional (3D); single input multiple output (SIMO)

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Chen, S.; Luo, C.; Deng, B.; Wang, H.; Cheng, Y.; Zhuang, Z. Three-Dimensional Terahertz Coded-Aperture Imaging Based on Single Input Multiple Output Technology. Sensors 2018, 18, 303.

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