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Launch Date :15.04.2010


GSAT-4 is an experimental technology demonstrator for satellite communication in Ka band.  The spacecraft, with a lift-off mass of 2218 kg, and a power generating capability of 2.7 KW was flown onboard the development flight with first indigenous cryogenic upper stage (CUSP) of GSLV (GSLV-D3).

The spacecraft was launched on April 15, 2010 but could not be placed in the intended orbit due to snags in launch vehicle performance. GSAT-4 carried a multi channel Ka-band, bent pipe and regenerative transponder, and a navigation payload GAGAN (GPS and GEO augmented navigation) operating in C, L1 & L5 band to augment the accuracy of GPS.

GSAT-4 employed several new onboard technologies such as Electrical Propulsion System for North/South station keeping (NSSK) operations, Bus Management Unit for TM, TC,  AOCE & sensor electronics integrated functions, Miniaturized Dynamically Tuned Gyros with processor based electronics, 70 V bus for Ka-band TWTAs, Mil-Std 1553 Bus configuration etc. GSAT-4 also incorporated technological experiments like on-board structural dynamic experiment, thermal control coating experiment and vibration beam accelerometer. However, GSAT-4 was not placed in orbit as GSLV-D3 could not complete the mission. 



Platform System

I-2K (I-2000) Bus

Lift-off Mass

2218 Kg

Spacecraft Power

Solar Array: 2759 Watts         Batteries: Li-ion (35 Ah)


3-axis  body stabilized using momentum/reaction wheels, magnetic torquers, sensors    and thrusters


8 Ka-band bent pipe and regenerative payload & GAGAN (GPS and GEO augmented navigation) operating in C, L1 & L5 band

Launch Date

April 15, 2010

Launch Vehicle



Not achieved

Mission Life

7 Years



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