Presented by:Anurag Dubey

Vishal ThatikondaAvinash Menon

Mohd. Yusuf

SATELLITE COMMUNICATION

Introduction:• The world today has become increasingly dependent on

information and communication technologies (ICT). • Communication Satellites today have become an integral part of

global information infrastructure, connecting people across the world and serving communications needs of individuals, businesses and governments.

• Satellite communications is enabling breakthroughs like intercontinental telephony, live television from remote regions, the broadcasting of television channels to all citizens, global positioning, trunking for telecom operators and reliable data networks for private companies.

• In recent years, satellite technology has seen a significant leap in advancement.

The Radio Experiment

• 1897, Marconi sent the first ever wireless communication over open sea. The experiment, witnessed a message transverse over the Bristol Channel a distance of 6 mms. The message read "Are you ready"

WHAT IS A COMMUNICATION

SATELLITE?

A satellite is an object that orbits another large object like planet.

A communication satellite is a station in space that is used for telecommunication, radio and television signals.

The first satellite with radio transmitter was in 1957.

• In 1962, the American Telecommunication giant AT & T launched the world first true communication satellite ,called Telstar.

• Telstar was the first active, direct relay communications satellite. • It was launched by NASA from Cape Canaveral on July 10, 1962, the first

privately sponsored space launch. • Since then, countless communication satellites have been placed into

earth orbit, and the technology being applied to them is growing is growing in sophistication.

How do Satellites Works?

• Two Stations on Earth want to communicate through radio broadcast but are too far away to use conventional means.

• The two stations can use a satellite as a 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.

HOW SATELLITES ARE USED

• Fixed Service Satellites (FSS) Example: Point to Point Communication• Broadcast Service Satellites (BSS) [Also called as Direct Broadcast Service]

Example: Satellite Television/Radio• Mobile Service Satellites (MSS)

Example: Satellite Phones

Fixed Service Satellites (FSS)

Fixed satellite service (FSS) is the official classification for geostationary communications satellites that provide broadcast feeds to television stations, radio stations and broadcast networks.

FSSs also transmit information for telephony, telecommunications, and data communications.

Satellites providing Fixed-Satellite Services (FSS) transmit radio communications between ground Earth stations at fixed locations.

E.g:Point-to-Point Communication

Broadcast Service Satellites (BSS) Broadcast Service Satellites is also known as Direct-

Broadcast Service (DBS). Direct-broadcast satellite (DBS) is a term used to refer

to satellite television broadcasts intended for home reception.

A direct broadcasting satellite is similar to a fixed service satellite (FSS) however it offers a higher power output requiring smaller antennas for receiving the signal.

Subscribers to DBS service use small reception dishes to receive television programming beamed down from satellites that orbit over the equator.

Mobile Service Satellites (MSS)• Mobile satellite service is service that links mobile

earth stations with base stations and with one another via one or more satellites.

• Mobile-Satellite Services (MSS) use a constellation of satellites that provide communications services to mobile and portable wireless devices such as cellular phones and Global Positioning Systems.

• E.g.: Satellite phones

Importance of satellite communication in today’s world:Communication satellites are not only playing an important role in facilitating business and commerce the world over, but are also important agents for socio-economic development.

APPLICATIONS: Some typical applications of communication satellites are:• Internet Access · • Broadband Data Communications · • Rural Telephony · · • News Distribution · • Distance Learning · • Multicast Services · • Land Mobile Communications ·• National & Multinational Networks and Aeronautical & Maritime

Links

Advantages:• Easy to install new circuits• Broadcast possibilities• Temporary applications (restoration)• User has control over own network• Mobile communication can be easily established by satellite

communication.• Satellite communication is economical compared with terrestrial

communication particularly where long distances are involved.• Compared to the optical fiber communication, satellite

communication has the advantages that, quality of transmitted signal and location of sending and receiving stations are independent of distance.

Disadvantages:• Large up front capital costs (space segment and launch).• Interference and propagation.• Congestion of frequencies and orbit.• The antenna noise due to energy.• Atmosphere behaves as a resistive medium.• Expensive.

A vision of 2020… Most peoples will experience HD and ultra-HD media and TV

viewing at home on multiple sets as linear viewing continues to be the mode of choice for consuming TV content.

Media content will be delivered using a combination of fiber, cable networks, wireless terrestrial networks and satellites, leveraging the strengths of each individual technology and forming ―hybrid satellite-terrestrial networks.

Satellite technology will be a key solution for wide-scale media and data distribution, whether for digital cinemas, private homes or enterprises in urban or remote locations

Satellite services will remain a non-intrusive, instant infrastructure, neither harming protected areas nor disturbing delicate ecosystems.

Terrestrial networks will rely on satellite and fiber for efficiency, e.g., to distribute high-demand content to the network edges speedily.

Remote facilities, energy plants and industrial processes will be monitored 24/7 by satellite.

Conclusion: Satellites will remain the best utilization used for communications due to their speed and other advantages mention in this presentation.

REFERENCES:• Digital Satellite Communication-Tri T. H• Satellite Communication-Monojit Mehra• http://electriciantraining.tpub.com/14189/css/

14189_135.htm• Wikipedia• http://infofavour.blogspot.in/2013/06/satellite-

communication-with-its.html

THANK YOU!!!