By L. G. Napolitano
Read or Download Communications Satellite Symposium. Proceedings of the XXVIII International Astronautical Congress, Prague, 25 September–1 October 1977 PDF
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Extra resources for Communications Satellite Symposium. Proceedings of the XXVIII International Astronautical Congress, Prague, 25 September–1 October 1977
Example text
The daily (diurnal) variations in longitude due to eccentricity can erode a substantial part of the longitudinal control budget, and there was a tendency for the eccentricity error to increase beyond its allowable bounds before it could be placed in check. By sun-oriented eccentricity control, this parameter is held in check in a well-behaved manner. The technique involves the control of the perigee of the geostationary orbit in a way such that the right ascension of the perigee is maintained at a certain angle with respect to the right ascension of the sun.
The basic CBC distribution system permits centralized cue and control switching of the majority of the transmitting and receiving facilities used in providing CBC satellite service. 11 Another recent innovation which has been implemented in the last two years at certain locations is the provision of a single non-switchable television service at a very low cost. Such service is called the Frontier TV service. It permits the introduction of television to very small communities (less than 500 people) under an affiliate basis with the CBC.
As experience was gained, improvements were made to various parts of the system and the operational routine. One of the most significant innovations was the development of the sun-oriented eccentricity control technique. The daily (diurnal) variations in longitude due to eccentricity can erode a substantial part of the longitudinal control budget, and there was a tendency for the eccentricity error to increase beyond its allowable bounds before it could be placed in check. By sun-oriented eccentricity control, this parameter is held in check in a well-behaved manner.