At the first German Spacelab Mission D1 in autumn 1985 a navigation experiment was flown for seven days on board the NASA Space Shuttle Challenger. Two atomic clocks, one Cs- and one Rb-standard, were part of the spaceborne equipment and were carried back to earth. The Cs-clock was compared with a ground based Cs-clock by a two way microwave link at 1.5 GHz in the periods of ground contact, while the comparison between the flying Cs- and Rb-clock occurred continuously. The influence of the space flight on clock rates was determined by comparison with many series of measurements on the ground before and after the D-1 Mission. Comparisons of the flight clocks at Cape Kennedy with the reference clock in Germany were performed via GPS. Results of the data evaluation will be presented with special attention to temperature effects. Unexpected rate oscillations between the two flying clocks correlated with the attitude of the space vehicle were discovered.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Performance of Atomic Clocks Flown on the Space Shuttle Experiment NAVEX


    Contributors:
    J. Hammesfahr (author) / H. Nau (author) / S. Starker (author)

    Publication date :

    1987


    Size :

    13 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    NAVEX: A space shuttle experiment with atomic clocks

    Starker, S. / Nau, H. / Hamesfahr, J. et al. | NTRS | 1983



    The Arizona Airglow Experiment as Flown on Four Space-Shuttle Missions

    Knecht, D. J. / Murad, E. / Viereck, R. et al. | British Library Conference Proceedings | 1997


    Navigationsexperiment NAVEX, Meßdatenspeicherung und -aufbereitung

    Hammesfahr, Jens / Institut für Hochfrequenztechnik, Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt (DFVLR), Oberpfaffenhofen | TIBKAT | 1989


    Solidification experiment in mirror furnaces flown in a gas payload on Space Shuttle STS-108

    Holm, P. / Loth, K. / Larsson, B. et al. | British Library Conference Proceedings | 2003