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Sensors 2015, 15(12), 30856-30869; doi:10.3390/s151229832

DOA Estimation under Unknown Mutual Coupling and Multipath with Improved Effective Array Aperture

University of Adelaide Radar Research Centre, School of Electrical and Electronic Engineering, The University of Adelaide, Adelaide, SA 5005, Australia
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Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 29 September 2015 / Revised: 2 December 2015 / Accepted: 2 December 2015 / Published: 8 December 2015
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [399 KB, uploaded 9 December 2015]   |  

Abstract

Subspace-based high-resolution direction of arrival (DOA) estimation significantly deteriorates under array manifold perturbation and rank deficiency of the covariance matrix due to mutual coupling and multipath propagation, respectively. In this correspondence, the unknown mutual coupling can be circumvented by the proposed method without any passive or active calibration process, and the DOA of the coherent signals can be accurately estimated accordingly. With a newly constructed matrix, the deficient rank can be restored, and the effective array aperture can be extended compared with conventional spatial smoothing. The proposed method achieves a good robustness and DOA estimation accuracy with unknown mutual coupling. The simulation results demonstrate the validity and efficiency of the proposed method. View Full-Text
Keywords: DOA estimation; coherent signals; mutual coupling; matrix reconstruction DOA estimation; coherent signals; mutual coupling; matrix reconstruction
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. (CC BY 4.0).

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MDPI and ACS Style

Wang, Y.; Trinkle, M.; Ng, B.W.-H. DOA Estimation under Unknown Mutual Coupling and Multipath with Improved Effective Array Aperture. Sensors 2015, 15, 30856-30869.

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