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International Journal of Antennas and Propagation
Volume 2016 (2016), Article ID 1852659, 8 pages
http://dx.doi.org/10.1155/2016/1852659
Research Article

Improved OAM-Based Radar Targets Detection Using Uniform Concentric Circular Arrays

1College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China
2School of Electronic Engineering and Computer Science, Queen Mary University of London, London E1 4NS, UK

Received 17 January 2016; Revised 8 April 2016; Accepted 4 May 2016

Academic Editor: Diego Masotti

Copyright © 2016 Mingtuan Lin et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Without any relative moves or beam scanning, the novel Orbital-Angular-Momentum- (OAM-) based radar targets detection technique using uniform concentric circular arrays (UCCAs) shows the azimuthal estimation ability, which provides new perspective for radar system design. However, the main estimation method, that is, Fast Fourier Transform (FFT), under this scheme suffers from low resolution. As a solution, this paper rebuilds the OAM-based radar targets detection model and introduces the multiple signal classification (MUSIC) algorithm to improve the resolution for detecting targets within the main lobes. The spatial smoothing technique is proposed to tackle the coherent problem brought by the proposed model. Analytical study and simulation demonstrate the superresolution estimation capacity the MUSIC algorithm can achieve for detecting targets within the main lobes. The performance of the MUSIC algorithm to detect targets not illuminated by the main lobes is further evaluated. Despite the fact that MUSIC algorithm loses the resolution advantage under this case, its estimation is more robust than that of the FFT method. Overall, the proposed MUSIC algorithm for the OAM-based radar system demonstrates the superresolution ability for detecting targets within the main lobes and good robustness for targets out of the main lobes.