Direction-of-Arrival Estimation for Coherent Sources via Sparse Bayesian Learning

Table 1

Outline of SF RVM-DOA.

Initialization: Use the independent RVM-DOA [12] to estimate source directions coarsely until primary convergence criterion is satisfied (and jointly detect their number if necessary).
DOA estimate refinement:
(1) Design spatial filters based on 𝜗1,…,𝜗𝐾 and compute 𝑌1,…,𝑌𝐾.
(2) Update 𝛾𝑘 and 𝜎^2𝑘 for 𝑘=1,…,𝐾 according to (13) and (14).
(3) Estimate 𝜗1,…,𝜗𝐾 according to (15).
(4) Stop if final convergence criterion is satisfied; otherwise, go back to (1).