27-04-2017, 01:53 PM
satellite communications by pritchard pdf
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satellite communication by pritchard pdf
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satellite communications by pritchard pdf
28-04-2017, 11:48 AM
A communications satellite is an artificial satellite that retransmits and amplifies radio telecommunication signals through a transponder; It creates a communication channel between a source transmitter and a receiver in different parts of the Earth. Communications satellites are used for television, telephone, radio, internet and military applications. There are more than 2,000 communications satellites in Earth's orbit, used by private and government organizations.
Wireless communication uses electromagnetic waves to carry signals. These waves require a line of sight, and therefore are obstructed by the Earth's curvature. The purpose of communications satellites is to retransmit the signal around the Earth's curve allowing communication between widely separated points. Communications satellites use a wide range of radio and microwave frequencies. To avoid signal interference, international organizations have regulations for which frequency ranges or "bands" that certain organizations may use. This band allocation minimizes the risk of signal interference.
The use of satellite communications has spread and is ubiquitous across the country for applications as diverse as television, DTH, DSNG and VSAT broadcasting to exploit unique capabilities in terms of coverage and reach. The technology has matured substantially in the last three decades and is being used on a commercial basis for a large number of applications. Most of us are touched by satellite communication in more ways than we realize.
The potential of technology for society applications continues to fascinate ISRO and efforts are in taking advantage of the benefits of technology for the betterment of humanity. Important initiatives undertaken by ISRO for the development of society include tele-education, telemedicine, Village Resource Center (VRC) and Disaster Management System (DMS) programs. The potential of space technology for national development applications is enormous.
Wireless communication uses electromagnetic waves to carry signals. These waves require a line of sight, and therefore are obstructed by the Earth's curvature. The purpose of communications satellites is to retransmit the signal around the Earth's curve allowing communication between widely separated points. Communications satellites use a wide range of radio and microwave frequencies. To avoid signal interference, international organizations have regulations for which frequency ranges or "bands" that certain organizations may use. This band allocation minimizes the risk of signal interference.
The use of satellite communications has spread and is ubiquitous across the country for applications as diverse as television, DTH, DSNG and VSAT broadcasting to exploit unique capabilities in terms of coverage and reach. The technology has matured substantially in the last three decades and is being used on a commercial basis for a large number of applications. Most of us are touched by satellite communication in more ways than we realize.
The potential of technology for society applications continues to fascinate ISRO and efforts are in taking advantage of the benefits of technology for the betterment of humanity. Important initiatives undertaken by ISRO for the development of society include tele-education, telemedicine, Village Resource Center (VRC) and Disaster Management System (DMS) programs. The potential of space technology for national development applications is enormous.
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