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The development of techniques for the comparison of distant clocks and for the distribution of stable and accurate time scales has important applications in metrology and fundamental physics research. Additionally, the rapid progress of frequency standards in the optical domain is presently demanding additional efforts for improving the performances of existing time and frequency transfer links. Present...
The development of techniques for the comparison of distant clocks and for the distribution of stable and accurate time scales has important applications in metrology and fundamental physics studies. Additionally, the rapid progress of frequency standards in the optical domain is presently demanding additional efforts for improving the performances of existing time and frequency transfer links. Present...
The ACES (atomic clock ensemble in space) mission is an ESA - CNES project with the aim of setting up onboard the international space station (ISS) several highly stable atomic clocks with a microwave communication link (MWL). The specifications of the MWL are to perform ground to space time and frequency comparisons with a stability of 0.3 ps at one ISS pass and 7 ps at one day. The ACES mission...
The microwave link (MWL) is a key piece of equipment of the ACES payload. Consisting of a flight segment and a ground terminal, the MWL is used to transmit the ACES clock signal to the ground. It performs space-to-ground clock comparison and ground-to-ground comparison of time & frequency reference systems.
During qualification tests of phase stable cables for the ACES ("atomic clock ensemble in space") flight segment, an unexpected frequency dependency of thermally induced phase drift of RF cables has been discovered. These observations led to a thorough test campaign involving high performance RF cables from a variety of manufactures. Tests have been performed at frequencies ranging from...
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