Activities at the State Time and Frequency Standard of Russia
INSTITUTE OF METROLOGY FOR TIME AND SPACE MENDELEEVO (RUSSIA
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A campaign on the State Time and Frequency Standard modernization is continuing. A second prototype of the primary Cs fountain standard with an uncertainty of 5 10exp -16 is under assemblage and is scheduled to be ready by the end of 2011. Today, we have two new ensembles each of four H-masers of type CH1-75A with individual cavity auto-tuning systems. The whole instrumentation set includes distribution amplifiers, a frequency and time measuring system, and a real-time scale generation and distribution system. All these instruments are installed in thermally and humidity controlled chambers. As a result, the frequency stability of H-masers for a 1-day basis is about a few parts in 10exp -16. The new remote clock comparison system consists of several multichannel dual-frequencys GLONASSGPS TTS-3 receivers. A new GLONASSGPSGALILEO TTS-4 receiver is expected by the end of November. All TTS-3 receivers were differentially calibrated relative to BIPMs portable receiver last year. Just now, we have completed new measurements within a new calibration campaign arranged by the BIPM. Two TWSTFT stationary stations and a transportable one were tested in VNIIFTRI last summer. VNIIFTRI is ready to join the Europe-Asia link via the AM-2 satellite when it receives a radio license. During the last year, considerable changes have happened in the secondary laboratories in Khabarovsk and Petropavlovsk Kamchatsky. The paper delivers somewhat detailed information and some preliminary results.
- Test Facilities, Equipment and Methods