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Sensors 2017, 17(2), 230; doi:10.3390/s17020230

Wideband Direction of Arrival Estimation in the Presence of Unknown Mutual Coupling

School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China
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Academic Editor: Vittorio M. N. Passaro
Received: 23 August 2016 / Revised: 12 January 2017 / Accepted: 13 January 2017 / Published: 6 February 2017
(This article belongs to the Section Physical Sensors)
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Abstract

This paper investigates a subarray based algorithm for direction of arrival (DOA) estimation of wideband uniform linear array (ULA), under the presence of frequency-dependent mutual coupling effects. Based on the Toeplitz structure of mutual coupling matrices, the whole array is divided into the middle subarray and the auxiliary subarray. Then two-sided correlation transformation is applied to the correlation matrix of the middle subarray instead of the whole array. In this way, the mutual coupling effects can be eliminated. Finally, the multiple signal classification (MUSIC) method is utilized to derive the DOAs. For the condition when the blind angles exist, we refine DOA estimation by using a simple approach based on the frequency-dependent mutual coupling matrixes (MCMs). The proposed method can achieve high estimation accuracy without any calibration sources. It has a low computational complexity because iterative processing is not required. Simulation results validate the effectiveness and feasibility of the proposed algorithm. View Full-Text
Keywords: wideband; uniform linear array; mutual coupling; direction of arrival wideband; uniform linear array; mutual coupling; direction of arrival
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Li, W.; Zhang, Y.; Lin, J.; Guo, R.; Chen, Z. Wideband Direction of Arrival Estimation in the Presence of Unknown Mutual Coupling. Sensors 2017, 17, 230.

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