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Sensors 2017, 17(6), 1300; doi:10.3390/s17061300

Two-Dimensional DOA Estimation for Coherently Distributed Sources with Symmetric Properties in Crossed Arrays

National Digital System Engineering and Technological Research R&D Center, Zhengzhou 450001, China
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Academic Editors: Zhiguo Shi, Yujie Gu and Rongxing Lu
Received: 21 March 2017 / Revised: 1 June 2017 / Accepted: 5 June 2017 / Published: 6 June 2017
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Abstract

In this paper, a novel algorithm is proposed for the two-dimensional (2D) central direction-of-arrival (DOA) estimation of coherently distributed (CD) sources. Specifically, we focus on a centro-symmetric crossed array consisting of two uniform linear arrays (ULAs). Unlike the conventional low-complexity methods using the one-order Taylor series approximation to obtain the approximate rotational invariance relation, we first prove the symmetric property of angular signal distributed weight vectors of the CD source for an arbitrary centrosymmetric array, and then use this property to establish two generalized rotational invariance relations inside the array manifolds in the two ULAs. Making use of such relations, the central elevation and azimuth DOAs are obtained by employing a polynomial-root-based search-free approach, respectively. Finally, simple parameter matching is accomplished by searching for the minimums of the cost function of the estimated 2D angular parameters. When compared with the existing low-complexity methods, the proposed algorithm can greatly improve estimation accuracy without significant increment in computation complexity. Moreover, it performs independently of the deterministic angular distributed function. Simulation results are presented to illustrate the performance of the proposed algorithm. View Full-Text
Keywords: array signal processing; direction-of-arrival (DOA) estimation; coherently distributed (CD) sources; crossed array; symmetric property array signal processing; direction-of-arrival (DOA) estimation; coherently distributed (CD) sources; crossed array; symmetric property
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MDPI and ACS Style

Dai, Z.; Cui, W.; Ba, B.; Wang, D.; Sun, Y. Two-Dimensional DOA Estimation for Coherently Distributed Sources with Symmetric Properties in Crossed Arrays. Sensors 2017, 17, 1300.

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