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| Citation: | Chen Shuo, Luo Chenggao, Deng Bin, Qin Yuliang, Wang Hongqiang, Zhuang Zhaowen. Research on Resolution of Terahertz Coded-aperture Imaging[J]. Journal of Radars, 2018, 7(1): 127-138. doi: 10.12000/JR17089
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Research on Resolution of Terahertz Coded-aperture Imaging
DOI: 10.12000/JR17089 CSTR: 32380.14.JR17089
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Abstract
Terahertz coded-aperture imaging follows the basic principles of optical coded-aperture imaging and microwave coincidence imaging and is a novel imaging technique. Herein, the wave spatial distribution or illumination pattern is usually obtained by a sub-reflector antenna. Terahertz coded-aperture imaging has some significant advantages such as a high frame rate, high resolution, and ability of forward-looking and staring imaging. To achieve simultaneous functions of aperture coding and beam scanning, we designed a terahertz coded-aperture imaging system that utilizes digital sub-reflector antenna and quasi-optical techniques. Based on this system, we deduce and simulate the influencing factors on its resolution. Then, different algorithms are applied to the imaging model in order to verify the superiority of sparse reconstruction for coded-aperture imaging. Finally, we compare the imaging results of our imaging system and that of a traditional real aperture imaging structure for the same simulation parameters. The results prove that our imaging system performs better with high resolution, small volume, and low cost. This new imaging technique can be applied to areas such as battlefield reconnaissance, security checks, anti-terrorism, and terminal guidance.-
Keywords:
- Terahertz,
- Coded-aperture,
- Staring,
- Forward-looking
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References
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- Figure 1. System of THz Coded-Aperture Imaging (TCAI)
- Figure 2. Quasi-optical design of TCAI
- Figure 3. Schematic diagram of TCAI
- Figure 4. High-resolution principle of TCAI
- Figure 5. Space correlations of the reference signal matrix under different phase modulation ranges
- Figure 6. Time correlations of the reference signal matrix under different phase modulation ranges
- Figure 7. Space correlations of the reference signal matrix under different frequency modulation coefficients
- Figure 8. Space correlations of the reference signal matrix under different time-sampling intervals
- Figure 9. Space correlations of the reference signal matrix under different sampling times
- Figure 10. Space correlations of the reference signal matrix under different carrier frequencies
- Figure 11. Space correlations of the reference signal matrix under different reflector array-element numbers
- Figure 12. Space correlations of the reference signal matrix under different sizes of coding-aperture element
- Figure 13. Space correlations of the reference signal matrix under different imaging ranges
- Figure 14. The imaging target of gun, space and time correlations of the reference signal matrix
- Figure 15. The imaging results
- Figure 16. The comparisons of real array aperture and coded-aperture imaging