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.
System architectures for satellite newsgathering
Systemarchitekturen für die Nachrichtenerfassung für Satelliten
Comsat Technical Review ; 24 , 1-2 ; 95-143
1995
49 Seiten, 4 Quellen
Aufsatz (Zeitschrift)
Englisch
Fernsehrundfunktechnik , Antwortsender , Regen , Satellit , Satellitenantenne , Satellitenfunkantenne , Satellitenübertragung , Satellitennavigation , akustisches Oberflächenwellenfilter , Kommunikation , Kommunikationsdienst , Kommunikationssystem , Kommunikationstechnik , Datenreduktion , Antenne , Signalerkennung , Signalfluss , Signalprozessor , Signaltechnik , Mikroprozessor , Frequenz , Frequenzband , Systemarchitektur , Systemeigenschaft , Digitalsignalverarbeitungs-Chip , digitales Fernsehen , Modulation , troposphärische Wellenausbreitung , Vielfachzugriffsverfahren
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