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1887

access icon free Stokes parameters and DOA estimation of polarised sources with unknown number of sources

© The Institution of Engineering and Technology
Received 11/05/2017, Accepted 14/10/2017, Revised 11/10/2017, Published 18/10/2017

In this study, the problem of Stokes parameters and direction-of-arrival estimation of polarised sources is addressed based on the block-sparsity reconstruction, in case of an unknown number of sources. Since Stokes parameters have four components, the block-sparsity model of polarised sources is introduced by employing the difference coarray of the coprime array with cross-dipole sensors. In case of an unknown number of sources, a novel estimate approach is proposed by combining the block orthogonal matching pursuit (BOMP) algorithm with the deterministic maximum likelihood (DML). In the proposed approach, the DML test step and refining grid step are added in each iteration of BOMP to identify the number of sources and to reduce the estimation error incurred by the grid mismatch. This approach has low computational complexity and is suitable for both the completely polarised and partially polarised sources. Simulations are used to verify the performance of the proposed approach.

Inspec keywords: direction-of-arrival estimation; signal reconstruction; maximum likelihood estimation

Other keywords: stokes parameters; deterministic maximum likelihood; cross-dipole sensors; computational complexity; BOMP algorithm; direction-of-arrival estimation; block-sparsity reconstruction; coprime array; block orthogonal matching pursuit algorithm; DOA estimation; DML

Subjects: Other topics in statistics; Signal processing and detection

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