Satellite Communication Systems M Richharia Pdf Download

Earth stations are a vital element in any satellite communication network. The function of an earth station is to receive information from, or transmit information to, the satellite network in the most cost-effective and reliable manner while retaining the desired signal quality. Depending on the application, an earth station may have both transmit and receive capabilities or may only be capable of either transmission or reception. Further categorization can be based on the type of service. Usually, the design criteria are different for the Fixed Satellite Service (FSS), the Broadcast Satellite Service (BSS) and the Mobile Satellite Service (MSS).

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Communication via a satellite begins when the satellite is positioned in the desired orbital position. Several types of orbits are possible, each suitable for a specific application. However, only a few types of orbits are well suited for communication. In this chapter the basics of orbital mechanics are reviewed. After a general treatment, emphasis is put on the geostationary orbit because of its importance for satellite communication. In recent years there has been a heightened interest in the use of low and medium earth orbits. A section dealing with the issue of most efficient coverage from a non-geostationary orbit has been included. A section on launching of satellites into geostationary orbit is also included. In addition, several useful formulas, including some interesting results on low earth orbit constellation design and useful computer programs, are summarized in appendix B.

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