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Open AccessArticle

A Robust Direction of Arrival Estimation Method for Uniform Circular Array

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School of Machinery and Automation, Wuhan University of Science and Technology, Wuhan 430081, China
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Institute of Robotics and Intelligent Systems, School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
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School of Automation Science and Engineering, South China University of Technology, Guangzhou 510640, China
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(20), 4427; https://doi.org/10.3390/s19204427
Received: 28 August 2019 / Revised: 29 September 2019 / Accepted: 1 October 2019 / Published: 12 October 2019
(This article belongs to the Section Internet of Things)
Estimating the Direction of Arrival (DOA) is a basic and crucial problem in array signal processing. The existing DOA methods fail to obtain reliable and accurate results when noise and reverberation occur in real applications. In this paper, an accurate and robust estimation method for estimating the DOA of sources signal is proposed. Incorporating the Estimating Signal Parameters via Rotational Invariance Techniques (ESPRIT) algorithm with the RANdom SAmple Consensus (RANSAC) algorithm gives rise to the RAN-ESPRIT method, which removes outliers automatically in noise-corrupted environments. In this work, a uniform circular array (UCA) is converted into a virtual uniform linear array (ULA) to begin with. Then, the covariance matrix of the received signals of the virtual linear array is reconstructed, and the ESPRIT algorithm is deployed to estimate initial DOA of the source signal. Finally, the modified RANSAC method with automatically selected thresholds is used to fit the source signal to obtain accurate DOA. The proposed method can remove the unreliable DOA feature data and leads to more accuracy of DOA estimation of source signals in reverberation environments. Experimental results demonstrate that the proposed method is more robust and efficient compared to the traditional methods (i.e., ESPRIT, TLS-ESPRIT).
Keywords: DOA estimation; RANSAC algorithm; uniform circular array; ESPRIT algorithm DOA estimation; RANSAC algorithm; uniform circular array; ESPRIT algorithm
MDPI and ACS Style

Xu, Z.; Wu, S.; Yu, Z.; Guang, X. A Robust Direction of Arrival Estimation Method for Uniform Circular Array. Sensors 2019, 19, 4427.

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