Overview of SKA calibration challenges and impact of design decisions

The Square Kilometre Array (SKA), a future radio telescope envisaged to be an order of magnitude more sensitive than current instruments, poses significant calibration challenges. We provide an overview of calibration challenges and discuss current insights in the interplay between calibration and system design. Although further research is required to make quantitative statements on the imaging dynamic range limitations imposed by calibration, we illustrate this interplay by deriving specific requirements on the size and filling factor of SKA aperture array stations.