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Sensors 2017, 17(5), 1086; doi:10.3390/s17051086

Ambiguity Resolution for Phase-Based 3-D Source Localization under Fixed Uniform Circular Array

School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China
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Author to whom correspondence should be addressed.
Academic Editors: Zhiguo Shi, Yujie Gu and Rongxing Lu
Received: 17 March 2017 / Revised: 18 April 2017 / Accepted: 3 May 2017 / Published: 11 May 2017
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Abstract

Under fixed uniform circular array (UCA), 3-D parameter estimation of a source whose half-wavelength is smaller than the array aperture would suffer from a serious phase ambiguity problem, which also appears in a recently proposed phase-based algorithm. In this paper, by using the centro-symmetry of UCA with an even number of sensors, the source’s angles and range can be decoupled and a novel algorithm named subarray grouping and ambiguity searching (SGAS) is addressed to resolve angle ambiguity. In the SGAS algorithm, each subarray formed by two couples of centro-symmetry sensors can obtain a batch of results under different ambiguities, and by searching the nearest value among subarrays, which is always corresponding to correct ambiguity, rough angle estimation with no ambiguity is realized. Then, the unambiguous angles are employed to resolve phase ambiguity in a phase-based 3-D parameter estimation algorithm, and the source’s range, as well as more precise angles, can be achieved. Moreover, to improve the practical performance of SGAS, the optimal structure of subarrays and subarray selection criteria are further investigated. Simulation results demonstrate the satisfying performance of the proposed method in 3-D source localization. View Full-Text
Keywords: 3-D source localization; phase ambiguity; uniform circular array; subarray grouping; ambiguity searching 3-D source localization; phase ambiguity; uniform circular array; subarray grouping; ambiguity searching
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Chen, X.; Liu, Z.; Wei, X. Ambiguity Resolution for Phase-Based 3-D Source Localization under Fixed Uniform Circular Array. Sensors 2017, 17, 1086.

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