Abstract An off‐grid weighted sparse Bayesian learning algorithm based on grid fission for direction of arrival estimation is proposed. The existing algorithms can use fewer points with variant intervals to estimate the true DOAs. However, their processes are traditional algorithm, which only assigns same prior distribution assumption signals all grids, but ignores difference signal different p...

Abstract We consider a non-Hermitian matrix orthogonality on contour in the complex plane. Given diagonalizable and rational valued weight, we show that Christoffel–Darboux (CD) kernel, which is built terms of orthogonal polynomials, equivalent to scalar reproducing kernel meromorphic functions Riemann surface. If this surface has genus $0$, then CD polynomials Interestingly, not necessarily ke...