Download e-book for kindle: An Introduction to Satellite Communications by D.I. Dalgleish

By D.I. Dalgleish

ISBN-10: 0863411320

ISBN-13: 9780863411328

The purpose of this publication is to provide a transparent and concise exposition of the foundations and perform of satellite tv for pc communications by means of describing the improvement of communications-satellite companies. will probably be worthwhile either to engineers who've labored in different fields of telecommunication and to scholars.

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Extra resources for An Introduction to Satellite Communications

Sample text

About 7000 ships are already fitted with MARISAT/INMARSAT Standard-A ship earth stations (SESs); this type of SES can provide a wide range of telephony, telegraphy and data services but the equipment is relatively complex and expensive, and can be difficult to install. By 1990 INMARSAT will be operating a store-and-forward data service; the Standard-C SESs required for this service will be only a fraction of the cost of a Standard-A station and very much smaller, and it is expected that many tens of thousands of these stations will be installed in the early 1990s.

FM-SCPC earth-station equipment comprises a channel unit for each pair of (outgoing and incoming) channels together with IF and RF equipment which is common to a group of channel units. Earth-station operators may thus minimise their initial capital investment by commencing operation with one set of common equipment and just enough channel units to carry the expected traffic. 6 SSB Some US terrestrial systems and domestic communications-satellite systems use single-sideband (SSB) modulation. In these systems an RF carrier is amplitude modulated with an FDM assembly of telephone channels and the residual carrier component is suppressed, together with one of the sidebands.

Fortunately, it is usually practicable to serve all of a national territory with one or more satellite antennas with relatively narrow beams and high gains, and this allows the use of small earth-station antennas. The antennas of the first ANIK stations serving communities in the far north of Canada had diameters of 4-5 m (which was very much smaller than most of the earth-station antennas in use when the system was established, although larger than many antennas used with more recent systems).

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An Introduction to Satellite Communications by D.I. Dalgleish

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