The document provides a general survey of the background and present status of the satellite communications field in general and of Defense Satellite Communications System (DSCS) in particular. The main body of the report provides general and technical data on the major sub-systems of a satellite communications network. The orbital characteristics of the spacecraft and the performance characteristics of the satellite transponder are explained. The characteristics of earth terminal receivers and transmitters are also covered. An explanation of the basic principles of multiplex, modulation, coding, and multiple access techniques is provided and applied to satellite communications. The basic parameters and essential formulas for understanding the analysis and engineering of satellite links and systems follows. A series of appendices provides reference data directly relating to the DSCS. This includes descriptions of DSCS Phase I and II satellites, of various DSCS earth terminals (on hand and under development) and a description of the past, present and proposed phases of the DSCS. Also provided is data on future trends in the satellite communications field and numerous nomographs and tables that are helpful in analyzing satellite communications engineering problems. (Author)


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