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Radio-astronomical imaging aims to probe a sky intensity image through an antenna array. The reconstruction quality highly depends on the calibration accuracy of the radio telescope. In this context, unknown time-dependent calibration kernels appearing in the measurement equation must be estimated. We rely on an alternating forward-backward structure to jointly estimate the sky image and the kernels, by solving a non-convex minimization problem incorporating data fidelity and advanced regularization terms.
This presentation is part of Minisymposium “MS72 - Inverse problems with imperfect forward models (2 parts)”
organized by: Yury Korolev (University of Cambridge) , Martin Burger (University of Muenster) .