The demand for satellite newsgathering (SNG) services, where mobile units using small antennas transmit programming material to a broadcast center via satellite, is growing rapidly. A study was conducted to examine satellite system architectures appropriate for this type of service. Topics addressed include the modulation and multiple-access transmission format; selection of the uplink frequency band for the SNG-to-satellite link; spacecraft implementation issues such as transponder channelization and antennas (with emphasis on add-on packages); and the provision of an auxiliary or coordination channel in the direction of the broadcast-center-to-SNG site. Other issues presented include rain impairment and uplink margin requirements for the SNG-to-satellite link operating at both Ku- and Ka-band, a comparison between channelized transponders implemented with surface acoustic wave filters and those with onboard digital processors, and considerations related to the placement of spacecraft antennas on an SNG add-on package. Based on the study results, an architecture consisting of digitally compressed video carriers operating in a frequency-division multiple-access mode, in combination with channelized transponders that apply automatic gain control to carriers on an individual basis, was recommended. This architecture maximizes uplink margins against rain impairment.


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    Titel :

    System architectures for satellite newsgathering


    Weitere Titelangaben:

    Systemarchitekturen für die Nachrichtenerfassung für Satelliten


    Beteiligte:
    Sandrin, W.A. (Autor:in) / Abdel-Nabi, T. (Autor:in) / Ames, S.A. (Autor:in) / Haschart, D.V. (Autor:in) / Price, K.M. (Autor:in) / Rao, A.K. (Autor:in)

    Erschienen in:

    Comsat Technical Review ; 24 , 1-2 ; 95-143


    Erscheinungsdatum :

    1995


    Format / Umfang :

    49 Seiten, 4 Quellen



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




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