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Subspace methods for self-calibration of ULAs with unknown mutual coupling: A false-peak analysis

Cai, S; Zhang, J; Wang, G; Zhu, H; Wong, KK; (2020) Subspace methods for self-calibration of ULAs with unknown mutual coupling: A false-peak analysis. Signal Processing , 174 , Article 107626. 10.1016/j.sigpro.2020.107626. (In press). Green open access

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Abstract

Self-calibration can mitigate the adverse effect of array imperfections in direction-of-arrival (DoA) estimation. In this paper, we consider self-calibration of uniform linear arrays (ULAs) with unknown mutual coupling and focus on subspace-based methods. By modeling the effect of mutual coupling through complex symmetric Toeplitz matrices, we first analyze its influence to existing subspace methods. Our analytical results illustrate that mutual coupling can induce false peaks in spatial spectra of these methods, and more importantly, most of these peaks are predictable. Based on the analytical results, we then propose new spectra to suppress these predictable false peaks, and new self-calibration algorithms for the proposed spectra. Simulations are performed to validate our analytical results and to illustrate the advantages of the proposed algorithms.

Type: Article
Title: Subspace methods for self-calibration of ULAs with unknown mutual coupling: A false-peak analysis
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.sigpro.2020.107626
Publisher version: https://doi.org/10.1016/j.sigpro.2020.107626
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Direction-of-arrival (DoA) estimation, Uniform linear array (ULA), Mutual coupling, Array self-calibration, Subspace method
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10097064
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