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    SATELLITE

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    nikhilacha9177
    Satellite communication allows transmission of signals between Earth stations via satellites. A satellite receives radio signals from an Earth station, amplifies them, and retransmits them to another Earth station. Key components are the transponder that converts uplink signals and sends them as downlinks, and Earth stations that transmit and receive signals. Satellites can be in low, medium or geostationary orbits, with geostationary satellites remaining fixed over one point of Earth. Satellite communication provides wide coverage, high capacity, and stable costs but can be costly to launch and maintain.

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    SATELLITE

    Uploaded by

    nikhilacha9177
    40 views14 pages
    Satellite communication allows transmission of signals between Earth stations via satellites. A satellite receives radio signals from an Earth station, amplifies them, and retransmits them to another Earth station. Key components are the transponder that converts uplink signals and sends them as downlinks, and Earth stations that transmit and receive signals. Satellites can be in low, medium or geostationary orbits, with geostationary satellites remaining fixed over one point of Earth. Satellite communication provides wide coverage, high capacity, and stable costs but can be costly to launch and maintain.

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    SATELLITE COMMUNICTAION

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    Satellite communication allows transmission of signals between Earth stations via satellites. A satellite receives radio signals from an Earth station, amplifies them, and retransmits them to another Earth station. Key components are the transponder that converts uplink signals and sends them as downlinks, and Earth stations that transmit and receive signals. Satellites can be in low, medium or geostationary orbits, with geostationary satellites remaining fixed over one point of Earth. Satellite communication provides wide coverage, high capacity, and stable costs but can be costly to launch and maintain.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    40 views14 pages

    SATELLITE

    Uploaded by

    nikhilacha9177
    Satellite communication allows transmission of signals between Earth stations via satellites. A satellite receives radio signals from an Earth station, amplifies them, and retransmits them to another Earth station. Key components are the transponder that converts uplink signals and sends them as downlinks, and Earth stations that transmit and receive signals. Satellites can be in low, medium or geostationary orbits, with geostationary satellites remaining fixed over one point of Earth. Satellite communication provides wide coverage, high capacity, and stable costs but can be costly to launch and maintain.

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    of 14

    Technical seminar-iii

    Date :29-01-2021
    Class :C5

    SATELLITE
    COMMUNICATION
    BY
    NAME; A.Nikhil
    ROLL NUMBER: 20311A04U9 1
    Contents
     Abstract
     Introduction
     How does it work?
     Components of a satellite
     Satellite communication system
     Types of satellites
     Advantages
    Disadvantages
    Conclusion
    References
    Abstract
     A Communication satellite is an artificial satellite the relays and
    amplifies radio telecommunications signals via a transponder; it
    creates a communication channel between a source transmitter
    and a receiver at different locations on the Earth.Communication
    Satellites are used for television,telephone,radio,internet and
    military applications.
    Introduction
    If the communication takes palce between
    any two earth stations through a
    satellite,then it is called as satellite
    communication.In this
    communication,electromagnetic waves are
    used as carrier signals.These signals carry
    information such as voice,video or any other
    data between ground and space and vice-
    versa.
    Soviet Union had launched the worid’s first artificial satellite
    named,Sputnik 1 in 1957.Nearly after 18 years,India also launched
    the artificial satellite named,Aryabhata in 1975.
    How does it works
     The process begins at an earth station an installation
    designed to transmit and receive signals from a satellite in
    orbit around earth.
    Earth stations send information in the form of high
    powered,high frequency(GHz)signals to satellites which
    receives and retransmit the signals back to earth where
    they are received by other stations in the coverage area of
    the satellite.
    The two stations can use a satellite as relay station for
    their communication
     One Earth station sends a
    transmission to the satellite
    .This is called a Uplink.

    The satellite Transponder converts


    the signal and sends it down to the
    second earth station.This is called a
    Downlink.
    Components of a satellite

    Satellite communication System
    Satellite Orbits
    Geostationary Earth Orbits:These satellites are in orbit 35683 km above the earth
    in geostationary orbit revolve around the earth at the same time of the earth
    rotates.This means GEO satellites remain in the same position relative to the
    surface of the earths.
    Medium Earth Orbits:These satellites are in orbit somewhere between 8000km
    and 18000km above the earth surface.MEO satellites are similar to LEO
    satellites in fuctionality and have a larger cover area than Leo satellites.
    Low Earth Orbits:LEO satellites are much close to earth than GEO satellites
    ranging from 500 to 1500km above the earth surface.These satellites don’t
    stay in fixed position relative to the surface and are only visible for 15-20
    minutes each pass.
    Advantages
    It has high channel capacity along with low error
    rates.
    It has the stable cost environment and covers a
    wide area.
    The coverage area of satellite greatly exceeds
    that of a terrestrial system.
    Disadvantages
    Launching satellites into orbit is costly.
    It requires expensive ground stations.
    It has limited frequency spectrum and orbital
    space.
    Satellite systems are not aimed to replace terrestrial system
    but at complementing them.

    Satellite communication technologies have achieved


    remarkable breakthrough effeciencies and increase in
    performance in nearly half a century.
    References
     Introduction to satellite communication by Bruce R.Elbert
     Lewis,Communication services via Satellite
     Heather E.Hudson,Communication satellites:Their Devolpment and impact
    Spiker,J.J.Digital Communication by Satellite.
    James Martin,Communications Satellite Systems.

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