Remote Optical and Fountain Clock Comparison Using BroadbandTWSTFT and GPS PPP

Abstract

International audienceVarious Yb ion, Sr lattice and Cs fountain clocks at INRiM, LNE-SYRTE, NPL and PTB had been compared simultaneously over a 3-week campaign using satellite-based techniques. With full 20 MChip/s modulation bandwidth TWSTFT links and PPP/iPPP analysis of GPS link data,instabilities of a few 1E-16 could be achieved for both techniques. For the calculation of the clock-to-clock ratios and their uncertainties, gap-tolerant weighted averaging with differentoptimized weighting functions was employed