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Launch Date: 18.04.2001


GSAT-1 was an experimental satellite launched onboard the first developmental test flight of the GSLV-D1 on April 18, 2001. It carried two C band transponders employing 10 W Solid State Power Amplifiers (SSPAs), one C band transponder using 50 W Travelling Wave Tube Amplifier (TWTA) and two S band transponders using 70W TWTA. GSAT-1 was used for conducting communication experiments like Digital Audio Broadcast, Internet Services and compressed Digital TV Transmission.It employed the standard INSAT 2A configuration without VHRR but with small common payload complement, and a number of technology experiments like indigenous heat pipe radiator panel, 10N thrusters, fast recovery star sensors, improved reaction and momentum wheels, improved solar sail and pyro electrical earth sensors.



Lift-off Mass

1530 Kg

Spacecraft Power

Solar Array: 1500 Watts


3-axis body stabilized usingmomentum/reaction wheels,magnetic torquers, sensorsand thrusters

Launch date

18 April 2001


3 C band transponders,
2 S band transponders

Launch site

SHAR, Sriharikota

Launch vehicle


Orbital Life

3 months


Sun Synchronous Geo stationary orbit


1.It was a scaled down versionof future geosynchronouscommunication spacecraft.
2.The first flight of GSLVplaced the spacecraft in an
orbit with period less than24 hours.
3. Management of slowlydrifting satellite with onboard automationthrough remoteprogramming capabilityavailable in the design.
4. Propellant and payloadsizing for the experimentedlaunch programme.
5.Exercising of back up LAM(using 4 numbers of 22 AYthrusters) and assessing itsoverheads if required to beused for operationalsatellites.

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