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Satellite Communications

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Presentation on theme: "Satellite Communications"— Presentation transcript:

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satellite communication - PowerPoint PPT Presentation

satellite communication

Describes what is satellite communication – powerpoint ppt presentation.

• Whats mean by satellite ?
• History of Satellites
• Layer Of Atmosphere
• Generalized communication system
• What are the components of a satellite?
• How Satellites Work ?
• How do satellite stay in orbit ?
• Why satellite are launched 36,000 Km from centre of earth ?
• Types of bands
• Types of orbits
• Global position system
• Advantages And Disadvantages Of satellite
• Uses of satellite
• A Satellite is a solid object which revolves around some body due to the effect of gravitational forces OR
• a satellite is an object which has been placed into orbit by human endeavour.
• Active satellites
• Passive Satellites
• Active satellites are complicated structures having a processing equipment called Transponder .
• An active satellite acts as a REPEATER
• Natural satellites
• artificial satellites.
• A passive satellite only reflects received signals back to earth.
• Ex.moon is a natural satellite of earth
• The world's first artificial satellite is the Sputnik 1
• was launched in 1957
• First satellite that was used for communication purpose in INDIA was -ARYABHATTA (19 April 1975)
• The first geostationary communication satellite -SYNCOM 3(19 Aug 1963).
• Father of geostationary communication satellite is
• -HAROLD ROSEN
• (Aircraft engineer)
• TROPOSPHERE
• STRATOSPHERE
• THERMOSPHERE
• 1 Message signal.
• 2 tranmitted signal.
• 3 received signal.
• 4 message signal.
• Many satellites are powered by rechargeable batteries.
• Small thrusters provide attitude i.e. stabilize the satellite's position in space.
• A Earth Station sends message in GHz range (Uplink).
• Satellite Receive and retransmit signals back. (Downlink)
• Difference between Downlink and Uplink frequency is
• 1.Gravitational force attraction between any two objects, given by
• 2.Centrifugal forcean outward-directed force that normally balances the inward-directed centripital force
• There are two relevant forces involved in this problem
•   Satellites never fall into the Earth this because Earth is round and curves.
• Satellites stay in orbit due to the balance of two factors
• Velocity and
• Gravitational pull between the Earth and the satellite.
• Different kinds of satellites use different frequency bands.
• LBand 1 to 2 GHz,
• S-Band 2 to 4 GHz
• C-Band 4 to 8 GHz
• X-Band 8 to 13 GHz
• Ku-Band 13 to 18 GHz
• K-Band 18 to 28 GHz
• Ka-Band 28 to 40 GHz
• There is a inverse relationship between frequency and wavelength.
• As wavelength increases (and frequency decreases), larger antennas (satellite dishes) are necessary to gather the signal.
• C-band is the most common frequency spectrums used by todays satellite.
• C-band satellite transmissions occupy the 4 to 8 GHz frequency range.
• C-band antenna is approximately 2-3 meters in diameter
• Ku-band satellite transmissions occupy the 13 to 18 GHz frequency range.
• Ku-band antennas can be as small as 18 inches in diameter
•  These very high frequency transmissions mean very small wavelengths and very small diameter receiving antennas.
• Low-Earth-Orbit (LEOs)
• Medium-Earth-Orbit (MEOs)
• Geostationary (GEOs)
• Altitude (600-1000 KM)
• satellite gives it a better signal strength
• Reduces transmission delay
• Disadvantages
• Smaller coverage area.
• Shorter life span (5-8 yrs.)
• 0.8 GHz range
• Small, low-cost
• Used for short communications.
• MEOs orbits between the altitudes of 8,000 - 20,000 km above the earth.
• MEO satellites have a larger coverage.
• These orbits are primarily reserved for communications satellites that cover the North and South Pole.
• MEOs are placed in an elliptical (oval-shaped) orbit.
• From the ground level the satellite appears fixed.
• GEO satellites have a 24 hour view of a particular area.
• Coverage to 40 of area Of planet by this satellite
• EQUATORIAL ORBIT
• POLAR CIRCULAR ORBIT
• INCLINED ORBIT
• EACH SATELLITE COVER 40 AREA
• SATELLITE MAKES AN ANGLE OF 120 WITH EACH OTHER.
• DISADVANTAGES
• Make repeated observations over a given area .
• At a time satellites observe a larger coverage
• Minimum Satellite lifetime is about 10-15 years.  
• Poor spatial resolution in the polar regions.
• Launching satellites into orbit is costly.
• IT IS USED FOR LONG DISTANCE COMMUNICATION.
• IT IS SPEEDY AND RELIABLE.
• IT IS USED FOR WEATHER FORECASTING.
• (study of atmosphere ,rain ,sunshine at any place at perticular time)
• IT IS USED FOR TRANSMIT T.V. SIGNAL OVER LARGE DISTANCE COMMUNICATION.
• POLAR SATELLITE IS USED FOR REMOTE SENSING.
• http//en.wikipedia.org/wiki/Geosynchronous_satell ie
• Geostationary Satellite(Author- Louis E.Frenzel)
• (Edition- Third)
• (Publication- Tata McGraw-Hill)
• http//web.mit.edu/invent/iow/rosen.html

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Satellite Communication

Mar 17, 2019

790 likes | 3.19k Views

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• active satellite
• satellite communication
• satellite telephones
• called active satellite
• typical satellite link involves

Presentation Transcript

Satellite Communication A heavy object which goes around in space due to the effect of gravitational force, used for broadband communication. In telecommunications, the use of artificial satellites to provide communication links between various points on Earth. Satellite communications play a vital role in the global telecommunications system.

Satellite communication has two main components: Ground segment: Ground segment, which consists of fixed or mobile transmission, reception, and

, and ancillary equipment. Space segment: Space segment which primarily is the satellite itself. A typical satellite link involves the transmission or up linking of a signal from an Earth station to a satellite. The satellite then receives and amplifies the signal and retransmits it back to Earth, where it is received and re-amplified by Earth stations and terminals

Satellite receivers on the ground include direct-to-home (DTH) satellite equipment, mobile reception equipment in aircraft, satellite telephones, and hand held devices. 1) Orbit: The path a Satellite follows around a planet is defined as an orbit.

Types of Satellite Orbits are: • Lower Earth orbit (LEO) • Middle Earth Orbit (MEO) • Geo Stationary Orbit (GEO) • Types of Satellites: • • Passive satellite • • Active satellite

Types of Satellites: A) Passive Satellite: These only reflect signals from one Earth station to another, or from several Earth stations to several others. It reflect the incident EM radiation without any modification or amplification. It can't generate power. B) Active Satellites: Satellites which can transmit power are called active satellite. These amplify or modify and retransmit the signal from the earth. Requires low power earth station and is less costly.

2) Antenna: Antenna (or aerial) is a transducer that transmits or receives electromagnetic waves. In other words, antennas convert electromagnetic radiation into electrical current, or vice versa. Antennas generally deal in the transmission and reception of radio waves.

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Satellite Communication Overview Satellite is a microwave repeater in the space. There are about 750 satellite in the space, most of them are used for communication. They are: Wide area coverage of the earth’s surface. Transmission delay is about 0.3 sec.

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Satellite Communication. Overview. Satellite is a microwave repeater in the space. There are about 750 satellite in the space, most of them are used for communication. They are: Wide area coverage of the earth’s surface. Transmission delay is about 0.3 sec.

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SATELLITE COMMUNICATION. Applicable to Indian Railways. Davinder Pal Singh Bawa B.Tech [ECE] 6 th sem CTIT,Shahpur. Contents. INTRODUCTION PRINCIPLE AND WORKING GLOBAL POSITIONING SYSTEM ON-BOARD UNIT WITH GPS IMPORTANT ESTABLISHMENTS EXPECTED BENEFITS CONCLUSION REFERENCES.

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Communication Satellite

Communication Satellite. References. Joe Montana, “Introduction to Satellite Communication,” George Mason University, http://classweb.gmu.edu/jmontana/lecture01.ppt Tanenbaum, Computer Networks, 4 th edition, Prentice Hall. Important Milestones (1950’s) Putting the pieces together.

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What Is a Satellite?

What is a satellite presentation, free google slides theme and powerpoint template.

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