GSAT-3 (EDUSAT)

7/27/2019 GSAT-3 (EDUSAT)

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BIRLA INSTITUTE OF

TECHNOLOGY AND SCIENCE,PILANI


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Satellite

Communication System

Edusat (GSAT-3)-Indias first exclusiveeducational satellite.


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Edusat (GSAT-3)

Abbreviated forEducational Satellite ,EDUSAT was Indias firstExclusive Educational

Satellite. Owned by the Ministry of

Education of India.

Mainly intended to meetthe demand for aninteractive satellite-based distanceeducation system for thecountry.


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Launch..

EduSAT was launchedon 20 September 2004 bythe Indian SpaceResearch Organisation.

It was launched intoa GeosynchronousTransfer Orbit on the firstoperational launch ofthe GeosynchronousSatellite LaunchVehicle, (GSLV (F04)

rocket) at Satish DhawanSpace Centre inSriharikota.


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Orbit, Apogee and Period !

EDUSAT was initiallyplaced into a transferorbit with

a perigee of 180kilometres (110 mi)and an apogee of35,985 kilometres(22,360 mi)

It has a period of 10.5hours, inclined at 19.2degrees to theequator.


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Other Basic Info :-

Payload: GramSat. Mass: 1,950 kg (4,290 lb).

Nation: India

Agency: ISRO Program: Insat.

Class: Communications

Type: Civilian communications satellite.Spacecraft: Gsat .

USAF Sat Cat: 28417 .

COSPAR: 2004-036A.

Apogee: 35,801 km (22,245 mi).

Perigee: 35,772 km (22,227 mi). Inclination: 0.1000 deg.

Period: 1,436.10 min.


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Purpose :-

Edusat was the first Indian satellite builtexclusively for the educational sector. It wasmainly intended to meet the demand for an

interactive satellite based distanceeducation system for India.

One of the main objectives is the RajivGandhi Project for EDUSAT SupportedElementary Education (RGPEEE)


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Supported by

The project is supported by MHRDISROIGNOU.

The role of ISRO was to set up the technicalinfrastructure

While IGNOU shared the responsibility todevelop the content and train teachers forthis mode of distance education.

MHRD

IGNOUISRO


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Benefitted by this project..

Visveswaraiah Technical University (VTU) isone of the main beneficiary of this pilotproject.

Under this project, all Engg. Colleges of

VTU are being networked with 1000nodes.


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New Innovations UsedCompared to earlier satellites in the Insat

series, Edusat used several newtechnologies.

The spacecraft was built around the I-2K

standardised spacecraft bus.


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New Innovations Used It had a Multiple Spot Beam Antenna with a

1.2 m reflector to direct Ku band spotbeams


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New Innovations UsedA dual core bent heat pipe for thermal

control


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Other New Innovations in EduSatcontd.

High efficiency multi-junction solar cellsand an improved thruster configuration

for optimised propellant use for orbit andorientation maintenance.

The satellite also used radiatively cooledKu-band Travelling Wave Tube Amplifiers

And a dielectrically loaded C-banddemultiplexer for its communicationpayloads.


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Payload

Edusat carried five Ku-band transpondersproviding spot beams.

One Ku-band transponder providing anational beam

Six Extended C-band transponders with anational coverage beam.

It was to join the Insat system that alreadyprovided more than 130 transponders in C-band, Extended C-band and Ku-band for avariety of telecommunication and televisionservices.


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Latest Status

First operational flight of launch vehicle.Launch delayed from July, August and

September 10.

Dry mass 820 kg. As of 2007 Mar 9 locatedat 73.92E drifting at 0.006W degrees perday.


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Network Configuration The RGPEEE Network configuration consist of

3.8 m Ku-Band Hub at PSM college Jabalpur(MP) and more than 700 Receive OnlyTerminals (ROTs) installed in Sidhi District of MP,and around 50 ROTs installed in HindiSpeaking states.

This network is basically a DTH type of networkbut the unique feature of the network is thatall the ROTs are Solar powered keeping inmind the power problem in villages.


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Configuration of ROT for

RGPEEE network The transmission scheme adopted for thenetwork is digital video broadcasting (DVB)based on the MPEG-2 video compression.


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Management of the network

Management is done at a Two Tier System.

1. The Apex Committee, which consists of

representatives of ISRO, MHRD, Participatingstate Governments; IGNOU; Indian Institute ofInformation Technology, Jabalpur, and RaniDurgavati University, Jabalpur,takes care ofpolicy decisions .

2. Standing committee takes care of day-to-day affairs of the network.


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UtilizationAt present the network with around 1000 ROTs

is being utilized for 2 h per day for transmissionof educational programs for primary andsecondary schools of Hindi states.

Contents developed: 600

Days of transmission: 382

Transmission hours: 1354

Teachers trained: 1599

Students benefited: 200 000.


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Challenges:Feedback and Monitoring

Daily transmission record of schools;

monitoring of meeting of cluster resourcecentre coordinators (CRCCs); monitoringof meetings of block resource centrecoordinators (BRCCs);

consolidation/review at District Institute ofEducation and Training (DIET); Interactiveresponse by Project Director, Jabalpur.


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Layout of the Program


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Vision

The future vision for this successful project is:-

To increase the number of terminals as well as

the increase in duration of transmission.

At least 1000 ROTs should be installed and

commissioned in each of participated Hindi

Speaking States in 23 years.

The 1012 h of transmission is visualized in 23

years.

The 2 hr broadcasts should be allotted toeach of the states based on their curriculum.


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Conclusion

The EduSat or the GSAT-3 has beensuccessful in its mission because of thesuccess of the teaching project across the

lengths and breadths of the central India. The new innovative technologies used herein

have helped in its timely operations andhave enabled it to operate more than its

estimated lifetime (i.e. 7 years). This paved the path to future technologies

scope of Satellite Communication inEducation.

GSAT-3 (EDUSAT)

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