Progress in the link calibration for UTC time transfer

International audienceThe dominant part of the total uncertainty budget in the [UTC-UTC(k)] is from the type B uncertainty (uB) in time link calibration. In 2011, the BIPM launched a pilot experiment to reduce the uB from 5 ns at present to ≤ 2 ns and has developed a standard calibration scheme, namely METODE, associated with an integrated portable GNSS calibrator and reference receivers stationary at BIPM. Similar setups are made in TL. Using these systems, we performed a series experiments at BIPM, OP and TL to study the reachable uncertainty of METODE. The results are compared to that of the traditional differential receiver calibrations