Download An Introduction to Satellite Communications by D.I. Dalgleish PDF

By D.I. Dalgleish

The purpose of this publication is to offer a transparent and concise exposition of the rules and perform of satellite tv for pc communications through describing the improvement of communications-satellite prone. it will likely be valuable 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

Demand assignment (DA) thus makes more efficient use of satellite capacity than pre-assignment (PA) particularly if the system serves a number of routes with different busy hours. DA can be particularly advantageous for stations with very small traffic loads because it is possible to gain access to any station in the system with (in the limit) a single channel and because space-segment charges can be related to the time for which a satellite channel is used. SPADE terminals are computer controlled and linked to other terminals in the system by a signalling channel.

The development of satellite communications 25 An application of domestic satellites which grew very fast in North America was the distribution of television and sound programmes to the head ends of cable-TV systems, local broadcasting stations, hotels etc. The first transmission of pay-TV by satellite was made in 1975 and by 1982 there were over 10000 TV receive-only (TVRO) stations feeding cable-TV systems in the USA. This rapid growth in the size of the market brought an equally rapid reduction in the cost of TVRO earth stations.

The spot-beam antennas receive at 14 GHz and transmit at 11 GHz. As can be seen from Fig. 9, one of these antennas points east and one points west. The east and west beams are widely separated and there should therefore be little interference between them; nevertheless, orthogonal linearly-polarised transmissions are used to give additional isolation. Rain causes a reduction in the isolation between cross-polarised transmissions. The reduction is less for linear polarisation than for circular polarisation and linear polarisation is therefore used for the spot beams.

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