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Journal of Electronic Imaging

Radar imaging using electromagnetic wave carrying orbital angular momentum
Author(s): Tiezhu Yuan; Yongqiang Cheng; Hongqiang Wang; Yuliang Qin; Bo Fan
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Paper Abstract

The concept of radar imaging based on orbital angular momentum (OAM) modulation, which has the ability of azimuthal resolution without relative motion, has recently been proposed. We investigate this imaging technique further in greater detail. We first analyze the principle of the technique, accounting for its resolving ability physically. The phase and intensity distributions of the OAM-carrying fields produced by phased uniform circular array antenna, which have significant effects on the imaging results, are investigated. The imaging model shows that the received signal has the form of inverse discrete Fourier transform with the use of OAM and frequency diversities. The two-dimensional Fourier transform is employed to reconstruct the target images in the case of large and small elevation angles. Due to the peculiar phase and intensity characteristics, the small elevation is more suitable for practical application than the large one. The minimum elevation angle is then obtained given the array parameters. The imaging capability is analyzed by means of the point spread function. All results are verified through numerical simulations. The proposed staring imaging technique can achieve extremely high azimuthal resolution with the use of plentiful OAM modes.

Paper Details

Date Published: 5 April 2017
PDF: 11 pages
J. Electron. Imag. 26(2) 023016 doi: 10.1117/1.JEI.26.2.023016
Published in: Journal of Electronic Imaging Volume 26, Issue 2
Show Author Affiliations
Tiezhu Yuan, National Univ. of Defense Technology (China)
Yongqiang Cheng, National Univ. of Defense Technology (China)
Hongqiang Wang, National Univ. of Defense Technology (China)
Yuliang Qin, National Univ. of Defense Technology (China)
Bo Fan, National Univ. of Defense Technology (China)

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