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29-04-2017, 11:43 AM

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jaseela123d · 01-05-2017, 01:06 PM

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.

In satellite communication, the signal transfer between the transmitter and the receiver is done with the help of the satellite. In this process, the signal which is basically a modulated microwave beam is sent to the satellite. The satellite then amplifies the signal and returns it to the receiver antenna present on the earth's surface. Thus, all the signal transfer is happening in space. Thus, this type of communication is known as spatial communication.

Two satellites that are commonly used in satellite communication are active and passive satellites.

1. Passive satellites: It is just a plastic globe with a metal coated on it. This sphere reflects the coming microwave signals coming from one part of the earth to another part. This is also known as passive sphere. Our land also has a passive satellite, that is, the moon.

2. Active Satellites: It basically does the job of amplifying the coming microwave signals. An active antenna system, transmitter, power supply and receiver are used in active satellites. These satellites are also called transponders. Transmitters installed on the ground generate microwaves. These beams are received by transponders connected to the satellite. After amplification, these signals are transmitted back to earth. This shipment can be done at the same time or after a certain delay. These amplified signals are stored in the satellites memory, when the earth is correctly facing the satellite. Then the satellite begins to send signals to the earth. Some active satellites also have programming and recording functions. These recordings can then be easily reproduced and viewed. The first active satellite was launched by Russia in 1957. The signals coming from the satellite when they reach the earth, are very low intensity.

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