The proposed ALFA space-based imaging interferometer mission consists of 16 identical small satellites with dipole antennas and low frequency radio receivers, distributed in a spherical array 100 km in diameter, and placed in a nearly circular distant retrograde orbit about the Earth, with a typical range of 10/sup 6/ km. Each satellite communicates directly with a small (11 m), low-cost antenna at each DSN site, providing parallel data paths and continuous coverage. The mission communications and navigation support system consists of an X-band frequency division multiplex (FDM) TT&C segment that uses a common 50 bps uplink channel and 17 downlink channels of 500 kbps each. The TT&C segment supports noncoherent precision Doppler ranging. Intersatellite ranging in the navigation support subsystem is accomplished by using the common four tone ranging technique over a UHF channel in the ISM (Industrial Scientific Medical) band.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    The ALFA constellation communications and navigation support system


    Beteiligte:
    Howard, R.E. (Autor:in) / Jones, D. (Autor:in) / Blume, W. (Autor:in) / Seybold, C. (Autor:in)


    Erscheinungsdatum :

    2000-01-01


    Format / Umfang :

    625687 byte





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    The ALFA Constellation Communications and navigation Support System

    Howard, R. E. / Institute of Electrical and Electronics Engineers | British Library Conference Proceedings | 2000


    MarsNet: A Mars Orbiting Communications & Navigation Satellite Constellation

    Bell, D. / Cesarone, R. / Ely, T. et al. | NTRS | 2000


    ALFA: A Constellation Mission for Low Frequency Radioastronomy

    Howard, R. E. / Institute of Electrical and Electronics Engineers | British Library Conference Proceedings | 2000


    ALFA: a constellation mission for low frequency radioastronomy

    Howard, R.E. / Jones, D. / Blume, W. et al. | IEEE | 2000


    Mars Network: A Mars Orbiting Communications & Navigation Satellite Constellation

    Bell, D. J. / Cesarone, R. / Ely, T. et al. | British Library Conference Proceedings | 2000