satellite communication by pritchard ,pearson publication download

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1. INTRODUCTION
A satellite is an object which has been placed into orbit by human endeavor. Such objects are sometimes called artificial satellites to distinguish them from natural satellites such as the Moon.
The first artificial satellite, Sputnik 1, was launched by the Soviet Union in 1957. By 2010 thousands of satellites have been launched into orbit around the Earth. These originate from more than 50 countries and have used the satellite launching capabilities of ten nations. A few hu ....etc

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RECENT TRENDS IN IP/NGEO SATELLITE COMMUNICATION SYSTEMS: TRANSPORT, ROUTING, AND MOBILITY MANAGEMENT CONCERNS
ABSTRACT
Non-geostationary (NGEO) satellite communication systems are seen as an attractive solution to realize the vision of anywhere, anytime pervasive access to the Internet. Their design and development have thus gained tremendous interest in the last few years. Commencing with a brief overview of general NGEO satellite configurations, this article next addresses the key technical difficulties in the development ....etc

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Satellite Communication Systems


TRANSMITTER CHAIN
Information to be transmitted is delivered
to the earth station via coaxial cable, fiber,
terrestrial microwave, or satellite. The
devices in the transmitter chain typically
consist of the multiplexer, the modulator,
the upconvertor, a high power amplifier,
and the antenna. The multiplexer
combines the individual channels onto a
single data stream. The information can
be encrypted and encoded with a f ....etc

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Abstract
LEO is Low Earth Orbit satellite.It circulates on a lower orbit in a shorter period . Additionally LEO systems try to ensure a high elevation for every spot of the earth to provide a highquality communication page link . The networks will play an important role in the evolving information infrastructure . It provides communication with shorter endto- end delays and e_ciency frequency usages . Some problems need to be solved before LEO satellite system can be successfully deployed . One of these problems is handover management . Even ....etc

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Mobile CommunicationsChapter 5: Satellite Systems


History of satellite communication


1945 Arthur C. Clarke publishes an essay about „Extra Terrestrial Relays“
1957 first satellite SPUTNIK
1960 first reflecting communication satellite ECHO
1963 first geostationary satellite SYNCOM
1965 first commercial geostationary satellite Satellit „Early Bird“ (INTELSAT I): 240 duplex telephone channels or 1 TV channel, 1.5 years lifetime
1976 three MARISAT satellites for maritime communication
1982 ....etc

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its advantages and disadvantages.
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