Sparse Bayesian learning (SBL) has given renewed interest to the problem of direction-of-arrival (DOA) estimation. It is generally assumed that the measurement matrix in SBL is precisely known. Unfortunately. this assumption may be invalid in practice due to the imperfect manifold caused by unknown or misspecified mutual coupling. https://www.ealisboa.com/flash-choice-Sten-Jacket-M-flash-find/