Satellite Communication

1. Academic Year 2017-18
EC6004 Satellite Communication
Application of Satellite Services
Mrs.R.Chitra, AP/ECE,
Ramco Institute of Technology,
Rajapalayam.

2. INMARSAT
 INMARSAT stands for International
Marine/MARitime SATellite organization with
headquarters at London.
 It is a British satellite telecommunications
company that was set up in 1979 by IMO to
enable ships to stay in touch with shore or to call
for help in an emergency, no matter how far out to
sea.
 So that emergency lifesaving services may be
provided to the distressed people/ships.

4.  It has now 85 member states. The USA maintains its
lead in INMARSAT by holding maximum share in it.
 It contributes in improving distress and safety of life
at sea, communication, efficiency and management
of ships.
 It serves all needs of maritime communication and
its services for over 5000 ships, boats fitted with
INMARSAT user equipment.
 Also involves national and international networks
covering telephone, facsimile, computer, fax, etc.

5. Frequency allocation
 Operation of satellite is in L band
1535 -1542.5MHZ for satellite to mobile
terminal 1636.5 – 1644 MHz for mobile terminal
to satellite
 Satellite transmission from and to CES are in C
band at 4.6GHz.

6. Space segment
 It has four GEO
satellites to
provide global
coverage.

7. Ground segment
 It has
 Large number of fixed earth stations and mobile
earth stations (MES)
 INMARSAT Network Control Center(NCC)
 Satellite control centers (SCC) for MES

8. World Space Services
 WorldSpace is the first satellite Digital Radio
Broadcasting system providing portable
reception
 It is the world’s only global media and
entertainment company positioned to offer a
satellite radio experience to consumers in
more than 130 countries with five billion
people, driving 300 million cars.
 World space delivers the latest tunes, trends
and information from around the world and
around the corner.

9.  In addition to audio content, World Space is
also providing multimedia contents, such as
Direct Media Service (DMS). DMS provides
huge amounts of the best web content,
selected by the subscriber, directly to the hard
drive of the user's PC, without the need for a
telephone line.
 World space subscribers benefit from a
unique combination of local programming,
original world space content and content from
leading brands around the globe including the
BBC ,CCN, NDTV and RFI.
Contd….

10.  It’s satellite cover two-thirds of the globe with sic
beams.
 Each beam is capable of delivering up to 80 channels
of high quality digital audio programming directly to
Worlds Space Satellite Radio syatem.
 World space is a pioneer of satellite based digital
radio services (DARS)
Contd….

11. Business TV (BTV)
 Business television (BTV) is the production and
distribution, via satellite, of video programs for
closed user group audiences.
 It often has two-way audio interaction component
made through a simple telephone line.
 It is being used by many industries including
brokerage firms, car dealers and delivery
services.
 BTV is an increasingly popular method of
information delivery for corporations and
institutions.
 Institution updates, news, training, meetings and
other events can be broadcast live to multiple
locations.

12.  The expertise of the best instructors can be
delivered to thousands of people without requiring
trainers to go to the site. Information can be
disseminated to all employees at once, not just a
few at a time.
 Television has been used to deliver training and
information within businesses for more than 40
years. Its recent growth began with the
introduction of the video cassette in the early
1970s. Even though most programming is
produced for video cassette distribution, business
is using BTV to provide efficient delivery of
specialized programs via satellite.
Contd….

13. Educational Adaptation of BTV
 The concept of BTV can be used by educational
institutions in several ways. An institution with
multiple sites can create its own network and
deliver information as needed.
 The information can be administrative or it can be
training for administrators and faculty.

14. GRAMSAT
 A Satellite based system is needed to cover
various components of rural development
programmes such as health, hygiene, agriculture
practices and environment etc.
 Guides with these views a dedicated satellite
called – GRAMSAT (‘Gram‘ means village in
Hindi Language and ‘Sat‘ is used for satellite) is
being planned for rural development and tele-
education in India.
 The Department of Space and Ministry of Rural
Development Government of India has sponsored
the GRAMSAT programme which is operating in
Orissa

15. Salient features of GRAMSAT
projects are
 Its communications networks are at the state
level connecting the state capital to districts,
blocks and enabling a reach to villages.
 It is also providing computer connectivity data
broadcasting, TV-broadcasting facilities having
applications like e- governance, development
information, teleconferencing, helping disaster
management.
 Providing rural-education broadcasting.

16.  However, the Gramsat projects have an
appropriate combination of following activities.
(i) Interactive training at district and block levels
employing suitable configuration
(ii) Broadcasting services for rural development
(iii) Computer interconnectivity and data exchange
services
(iv) Tele-health and tele-medicine services.
Contd….

17. E-mail Services
 The addition of Internet Access enables Astrium
to act as an Internet Service Provide (ISP)
capable of offering
Inmarsat users a tailor-made internet connection
 Astrium was an aerospace
manufacturer subsidiary of the European
Aeronautic Defence and Space Company (EADS)
that provided civil and military space systems and
services.
 Astrium’s E-mail service allows Inmarsat users to
send and receive e-mail directly through the
Internet without accessing a public telephone
network.

18. Video Conferencing
 Provide the same full, two –
way interactivity of satellite
broadcast at much lower cost.
 For multi-site meetings, video
conferencing uses bridging
systems to connect each site to
the others.
 Possible to configure a video
conference bride to show all
sites at the same time on a
projection screen or monitor.

19.  Bridge can show just the site from which a
person is speaking or making a presentation
Contd….

20. Internet Access
 Internet access provided through communications
satellites.
 Modern satellite internet service is typically
provided to users through GEO satellites that can
offer high data speeds.
 Newer satellite using Ka band to achieve data
speeds up to 50Mbps.

21. Components
 Satellite in GEO
 A number of ground stations known as gateways
that relay to and from the satellite via radio waves
 VSAT dish antenna with transceiver, located at
the subscriber’s premises.
 Other components include a modem at the user
end which links the user’s network with the
transceiver, and a centralized network operations
center (NOC) for monitoring the entire system.

22. References:
 Dennis Roddy, “Satellite Communication”, 4th
Edition, Mc Graw Hill International, 2006.
 Bruce R. Elbert, “The Satellite Communication
Applications”, Hand Book, Artech House Bostan
London, 1997.