Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.340...19v&link_type=abstract
In ESA, Frequency and Time Forum p 19-25 (SEE N93-24978 09-70)
Astronomy and Astrophysics
Astrophysics
2
Atomic Clocks, Frequency Measurement, Frequency Stability, Frequency Standards, Frequency Synchronization, Hydrogen Masers, Space Communication, Time, Time Measurement, Deep Space, Eureca (Esa), European Space Programs, Microwave Transmission, Nasa Space Programs, Range And Range Rate Tracking, Research And Development, Systems Engineering
Scientific paper
A program for the design and testing of atomic hydrogen (H) masers for general use in space and methods for high precision space to Earth time and frequency comparisons are described. Because of the similarity of the space masers' basic components to those of existing terrestrial masers, their frequency stability is expected to reach well below 1 part in 10(exp 15) for intervals between 1000 and 100,000 sec. A NASA funded development program at the Smithsonian Astrophysical Observatory (SAO), currently in a conceptual design phase, is specifically directed toward producing an H laser for space and testing it for 6 months in the ESA Eureca spacecraft. The maser design will have the capability to cope with stringent dynamic load test levels and will have sufficient lifetime for long term continuous operation in future deep space missions such as a close approach solar probe. The time comparison system for the Eureca test mission will use high precision (less than 50 ps) pulsed laser time transfer between the spacecraft and H maser equipped laser ranging Earth stations. European studies of the proposed inclusion of a second H maser for direct onboard frequency comparisons and of a modified PRARE (Precise Range and Range rate Equipment) microwave system (in addition to the laser system) for worldwide time synchronization are also discussed.
Busca Giovanni
Coyle L. M.
Decher Rudolf
Feltham S. J.
Leschiutta Sigfrid
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