The TOPEX/Poseidon orbit maintenance strategy was changed following launch to include the effects of observed unmodeled, and hence anomalous, along-track accelerations. The anomalous force causes the semi-major axis, a, to either increase (called "boost") or decrease ("deboost" or "decay") depending on the satellite attitude and solar array pitch angle offset. Although this force is the most uncertain parameter in ground track prediction, it has been used as a passive technique for orbit maintenance, thereby reducing the number of propulsive maneuvers, enhancing maneuver spacing, and to place maneuvers at convenient times. This passive technique was first demonstrated in May 1993. The TOPEX/Poseidon orbit has been uniquely maintained using both passive (non-propulsive) and active (propulsive) maneuvers. Furthermore, the orbit has been maintained using only the passive technique since the ninth orbit maintenance maneuver on January 15, 1996. Only nine orbit maintenance maneuvers have been required to maintain the ground track, including verification site over flights, since achieving the operational orbit on September 21, 1992 (mission requirement: 95% within +/- l km). During this period, a has varied within 7,714,429 +/- 7 m, while the inclination i periodically fluctuated in the range 66.0408 deg. +/- 0.0040 deg. The frozen orbit (required e < 0.001 and omega approximately equals to 90 deg.) has been maintained without any dedicated eccentricity maneuvers. The frozen eccentricity vector has completed two periodic cycles and it is currently tracing its third cycle (period approximately equals 26.7 months).


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    TOPEX/Poseidon orbit maintenance for the first five years


    Beteiligte:
    Bhat, R. S. (Autor:in) / Shapiro, B. E. (Autor:in) / Frauenholz, R. B. (Autor:in) / Leavitt, R. K. (Autor:in)


    Erscheinungsdatum :

    1998-05-01


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Keine Angabe


    Sprache :

    Englisch




    TOPEX/Poseidon Orbit Maintenance for First Five Years

    Leavitt, R. K. / Frauenholz, R. B. / Shapiro, B. E. et al. | NTRS | 1998


    TOPEX/Poseidon Orbit Maintenance for the First Five Years

    Bhat, R. S. / Shapiro, B. E. / Frauenholz, R. B. et al. | British Library Conference Proceedings | 1998


    TOPEX/POSEIDON orbit maintenance maneuver design

    Bhat, R. S. / Frauenholz, R. B. / Cannell, Patrick E. | NTRS | 1990


    In Orbit Evaluation of TOPEX/POSEIDON Orbit Maintenance Techniques

    Shapiro, Bruce / Bhat, Ram / Frauenholz, Ray | NTRS | 1994


    TOPEX/POSEIDON Orbit Acquisition Manuever Sequence

    Bhat, R. S. / Shapiro, B. E. / Frauenholz, R. B. | NTRS | 1993