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Two-Stage Nested Array Direction of Arrival Estimation for Mixed Signals

In this paper, a novel two-stage subspace-based direction of arrival (DOA) estimation algorithm with the nested array is proposed for mixed signals containing circular and non-circular ones. By exploiting the difference between the two types of steering vectors, the DOAs of circular signals are esti...

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Detalles Bibliográficos
Autores principales: Li, Wanru, Deng, Ke
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9319072/
https://www.ncbi.nlm.nih.gov/pubmed/35891115
http://dx.doi.org/10.3390/s22145435
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author Li, Wanru
Deng, Ke
author_facet Li, Wanru
Deng, Ke
author_sort Li, Wanru
collection PubMed
description In this paper, a novel two-stage subspace-based direction of arrival (DOA) estimation algorithm with the nested array is proposed for mixed signals containing circular and non-circular ones. By exploiting the difference between the two types of steering vectors, the DOAs of circular signals are estimated in the first stage. After eliminating the estimated information of circular signals by the covariance matrix reconstruction and oblique projection methods, the dimensions of the noise subspace are increased in estimating the DOAs of non-circular signals in the second stage. Through the two-stage estimation, the DOAs of the circular and non-circular signals are estimated separately and different types of signals with similar or the same DOAs can be distinguished. Furthermore, to avoid the two-dimensional (2-D) search with huge computational burden, a one-dimensional (1-D) search method exploiting the rank deficiency is proposed in the DOA estimation for non-circular signals. The simulation results show that the proposed algorithm can effectively improve the estimation accuracy and resolution probability, especially when circular and non-circular signals have similar DOAs.
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spelling pubmed-93190722022-07-27 Two-Stage Nested Array Direction of Arrival Estimation for Mixed Signals Li, Wanru Deng, Ke Sensors (Basel) Article In this paper, a novel two-stage subspace-based direction of arrival (DOA) estimation algorithm with the nested array is proposed for mixed signals containing circular and non-circular ones. By exploiting the difference between the two types of steering vectors, the DOAs of circular signals are estimated in the first stage. After eliminating the estimated information of circular signals by the covariance matrix reconstruction and oblique projection methods, the dimensions of the noise subspace are increased in estimating the DOAs of non-circular signals in the second stage. Through the two-stage estimation, the DOAs of the circular and non-circular signals are estimated separately and different types of signals with similar or the same DOAs can be distinguished. Furthermore, to avoid the two-dimensional (2-D) search with huge computational burden, a one-dimensional (1-D) search method exploiting the rank deficiency is proposed in the DOA estimation for non-circular signals. The simulation results show that the proposed algorithm can effectively improve the estimation accuracy and resolution probability, especially when circular and non-circular signals have similar DOAs. MDPI 2022-07-21 /pmc/articles/PMC9319072/ /pubmed/35891115 http://dx.doi.org/10.3390/s22145435 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Li, Wanru
Deng, Ke
Two-Stage Nested Array Direction of Arrival Estimation for Mixed Signals
title Two-Stage Nested Array Direction of Arrival Estimation for Mixed Signals
title_full Two-Stage Nested Array Direction of Arrival Estimation for Mixed Signals
title_fullStr Two-Stage Nested Array Direction of Arrival Estimation for Mixed Signals
title_full_unstemmed Two-Stage Nested Array Direction of Arrival Estimation for Mixed Signals
title_short Two-Stage Nested Array Direction of Arrival Estimation for Mixed Signals
title_sort two-stage nested array direction of arrival estimation for mixed signals
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9319072/
https://www.ncbi.nlm.nih.gov/pubmed/35891115
http://dx.doi.org/10.3390/s22145435
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AT dengke twostagenestedarraydirectionofarrivalestimationformixedsignals