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International Journal of Antennas and Propagation
Volume 2013, Article ID 386367, 6 pages
http://dx.doi.org/10.1155/2013/386367
Research Article

AR Model-Based Direction-of-Arrival Estimation of Coherent Signals in the Presence of Unknown Mutual Coupling

College of Electronic Science and Engineering, National University of Defense Technology, Changsha, Hunan 410073, China

Received 23 June 2013; Revised 17 September 2013; Accepted 1 October 2013

Academic Editor: Hao Ling

Copyright © 2013 Zhi-Chao Sha 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

This paper addresses the problem of direction-of-arrival (DOA) estimation of coherent signals in the presence of unknown mutual coupling, and an autoregression (AR) model-based method is proposed. The effects of mutual coupling can be eliminated by the inherent mechanism of the proposed algorithm, so the DOAs can be accurately estimated without any calibration sources. After the mixing matrix is estimated by independent component analysis (ICA), several parameter equations are established upon the mixing matrix. Finally, all DOAs of coherent signals are estimated by solving these equations. Compared with traditional methods, the proposed method has higher angle resolution and estimation accuracy. Simulation results demonstrate the effectiveness of the algorithm.