New York: McGraw-Hill, . Hardcover. 24 cm, 422 pages, illustrations. Name written in ink inside front board, DJ worn, torn in places, and missing small pieces. Space Communications can be defined as communications between a vehicle in outer space and Earth, using high-frequency electromagnetic radiation (radio waves). Provision for such communication is an essential requirement of any space mission. The total communication system ordinarily includes (1) command, the transmission of instructions to the spacecraft; (2) telemetry, the transmission of scientific and applications data from the spacecraft to Earth; and (3) tracking, the determination of the distance (range) from Earth to the spacecraft and its radial velocity (range-rate) toward or away from Earth by the measurement of the round-trip radio transmission time and Doppler frequency shift (magnitude and direction). A specialized but commercially important application, which is excluded from consideration here, is the communications satellite system in which the spacecraft serves solely as a relay station between remote points on Earth.
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Place_Pub: Washington, DC: INTELSAT, 1991. quarto, 63, wraps, maps, figures, tables, references, some soiling to covers, ink name on front cover This document was proprietary to INTELSAT when it was issued; it is no longer so categorized. Non-geostationary orbits for telecommunications have been studied as part of a broad technology assessment program undertaken by INTELSAT in preparation for a follow-on spacecraft program for INTELSAT VI. A number of potentially useful orbits below geostationary altitude and several elliptical orbits with unique orbital characteristics are described along with discussions of related orbital mechanics considerations.