Stokes parameters and DOA estimation of polarised sources with unknown number of sources
Wen-xiu Chang, Jingpei Ru, Lifei Deng · IET Radar Sonar & Navigation · 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.