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HAMSAT

Launch Date:20.09.2004 

EDUSAT

GSAT-3 known as EDUSAT was the first Indian satellite built exclusively for serving the educational sector. It was mainly intended to meet the demand for an interactive satellite based distance education system for the country. It strongly reflects India’s commitment to use space technology for national development, especially for the development of the population in remote andrural locations. EDUSAT was successfully launched by GSLV-F01 from SDSC SHAR on September 20, 2004.

The satellite was co-located with KALPANA-1 and INSAT-3C satellites at 74 deg East longitude. EDUSAT carried five Ku band transponders providing spot beams, one Ku band transponder providing a national beam and six extended C band transponders with national coverage beam. Compared to the preceeding satellites launched in the INSAT series, EDUSAT employed several new technologies.

The spacecraft was built around the standardized spacecraft bus called I-2K. It had a multiple spot beam antenna with 1.2 m reflector to direct precisely the Ku band spot beams towards their intended regions of India, a dual core bent heat pipe for thermal control, high efficiency multi-junction solar cells and an improved thruster configuration for optimized propellant use for orbit and orientation maintenance. The satellite used radiatively cooled Ku band Travelling Wave Tube Amplifiers (TWTAs) and dielectrically loaded C-band demultiplexer for its communication payloads.


Mission

Communication/Education

Lift-off Mass

1950 Kg

Spacecraft power

Solar Array: 2040 W

Stabilization

3 axis body stabilised in orbit using sensors, momentum and reaction wheels, magnetic torquers and eight 10 N & 22N reaction control thrusters.

Platform System

I-2K (I-2000) Bus

Payload

6 Ku band & 6 extended C band
transponders

Launch date

September 20, 2004

Launch site

SHAR, Sriharikota, India

Launch vehicle

GSLV-F01

Orbit

Geostationary (74°E longitude)

Mission Life

6 Years

Achievements

1.Growth potential of Tele-Education systems for country wide high quality mass education programmes

2.Very good performance of Ku band spot beams providing regional Tele-Education services 

3. Providing very fine spot beam pointing stability with I-2K bus attitude control system
4.Understanding of the behaviour of triple junction solar cells under the actual space conditions
5.Regional variants for  satellite based Ku band broadcasts and requirements thereof

           

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