Test of an orbiting hydrogen maser clock system using laser time transfer

Details Test of an orbiting hydrogen maser clock system using laser time transfer Test of an orbiting hydrogen maser clock system using laser time transfer

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ptti.nasa..401v&link_type=abstract

In NASA. Goddard Space Flight Center, Proceedings of the 23rd Annual Precise Time and Time Interval (PTTI) Applications and Plan

Astronomy and Astrophysics

Astrophysics

Clocks, Flight Tests, Frequency Stability, Global Positioning System, Hydrogen Masers, Optical Tracking, Astrophysics, Eureca (Esa), Gravitational Effects, Microwaves, Precision, Relativistic Effects, Space Programs, Synchronism, Tracking Stations

Scientific paper

We describe a joint Smithsonian Astrophysical Laboratory/National Aeronautics and Space Administration (SAO/NASA) program for flight testing a atomic hydrogen maser clock system designed for long-term operation in space. The clock system will be carried by a shuttle-launched EURECA spacecraft. Comparisons with earth clocks to measure the clock's long-term frequency stability (tau = 10(exp 4) seconds) will be made using laser time transfer from existing NASA laser tracking stations. We describe the design of the maser clock and its control systems, and the laser timing technique. We describe the precision of station time synchronization and the limitations in the comparison between the earth and space time scales owing to gravitational and relativistic effects. We will explore the implications of determining the spacecraft's location by an on-board Global Position System (GPS) receiver, and of using microwave techniques for time and frequency transfer.

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