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TY - UNPB AU - Boven, E.P. ED - Schaa, Volker RW TI - White Rabbit in Radio Astronomy J2 - Proc. of ICALEPCS2017, Barcelona, Spain, 8-13 October 2017 C1 - Barcelona, Spain T2 - International Conference on Accelerator and Large Experimental Control Systems T3 - 16 LA - english AB - The Square Kilometre Array (SKA) is a new radio telescope that is currently being designed. It will consist of two interferometric antenna arrays, one in South Africa and one in Australia, which together will cover a frequency span of 50 MHz to 13.8 GHz. Our design for the timing synchronization of all the receivers in these arrays uses White Rabbit to distribute absolute time. This talk will discuss how we will provide synchronization on these long distances, in the rather challenging climatic conditions of the semi-desert sites chosen for the SKA telescopes, and the improvements to WR we implemented for that. Very Long Baseline Interferometry (VLBI) is an instrumental method in radio astronomy where radio telescopes distributed all over the globe carry out observations simultaneously, and through aperture synthesis operate as a single radio telescope. As the resolution of such an instrument scales with the longest baseline between stations, global VLBI provides unsurpassed resolution in astronomy. In the ASTERICS project, we are demonstrating how White Rabbit can be used to distribute a coherent frequency reference for VLBI on public, shared fiber. PB - JACoW CP - Geneva, Switzerland ER -