Development of a High-Performance and Swiss Based Rolex Timescale System Including a Unique Optical Atomic Clock

A high-availability and high-stability timescale system, the Rolex Timescale, designed in collaboration between CSEM and METAS for Rolex, has been developed. This system, targeting state-of-the-art performances, consists of two distinct redundant timescales distant by more than 100 km. In view of the declaration of their constitutive clocks to the BIPM by METAS for their potential participation to the realization of UTC, the two timescales are compared by a calibrated GNSS time link.