The GSAT satellites are India's indigenously developed technologies of satellite communications, like digital audio, data and video broadcasting. GSAT has been designed with two S-band and 3 C-band transponders (a high power C-band and two indigenous C-band transponders). Uptill now 12 GSAT satellites have been launched by ISRO.
GSAT series of satellites is a bunch of geo-stationary satellites developed by ISRO with an objective to make India self-reliant in broadcasting services. GSAT-1 was the first candidate lifted to fulfill the same in 2001 and uptill now 12 GSAT satellites have been lifted in space so far. The repertoire of 12 GSAT satellites provide access to 167 transponders while 95 transponders are leased out to provide services to the broadcasters.
GSAT-4, also known as HealthSat was an experimental satellite launched on 15 April 2010. Due to failure in the upper cyrogenic stage of the GSLV launch rocket, the satellite was lost in sea. The satelitte was to test various new technologies including the GPS-aided geo-augmented navigation system. If the launch had been successful, then GSAT-4 would have been one of the heaviest satellites launched by India.
India's advanced communication satellite GSAT-10 was successfully launched on board Ariane-5 rocket from Europe's spaceport in French Guiana.It has a design life of 15 years and is expected to be operational by November, 2012 . It will augment telecommunication, direct-to-home and radio navigation services in India. With the lift-off mass of 3,400 kg GSAT-10 is the heaviest communication satellite developed by India. It was ISRO's 101st space mission. GSAT-10 is fitted with GAGAN and 30 transponders (12 Ku-band, 12 C-band and six Extended C-Band), which will provide vital augmentation to INSAT/GSAT transponder capacity.
GSAT-11 is planned to be launched in which will provide advanced telecom services in India. With a weight of 4.5 tonnes, it will weigh more than 150% as much as the biggest Indian satellite in orbit now. The advanced communications technology satellite will be launched in 2016 on board the Geo-Synchronus Satellite Launch Vehicle (GSLV-Mark III) from ISRO's spaceport at Sriharikota, about 80 km north-east of Chennai. The satellite will be designed at satellite centre in Bangalore, payloads consisting of 40 transponders in Ku/Ka band will be built at the space applications centre in Ahmedabad and the 630-tonne rocket (GSLV-Mark III) will be rolled out from the liquid propulsion systems centre in Thiruvananthapuram. With 16 high capacity multi-beams in Ku/Ka band, GSAT-11 will provide much faster uplinks for a host of communications and broadcasting services, including direct-to-home (DTH television). With a dry mass of 2.1 tonne, the spacecraft will provide 10 GHz of bandwidth, which will be equivalent to about 220 transponders of 36 MHz. The advanced satellite will employ a new 1-4K Bus (computer network). It will be configured with two-sided large solar array panels generating 11 KW of power. In the run-up to GSAT-11, the space agency is scheduling the launch of other communications satellites in the GSAT series by 2011-12.
List of satellites in the series
|S. No.||Satellite||Date of Launch||Launch Vehicle||Lift-off Mass (kg)|
|1.||GSAT-1||18 April 2001||GSLV-D1||1540|
|2.||GSAT-2||08 May 2003||GSLV-D2||1825|
|3.||GSAT-3 (EDUSAT)||20 September 2004||GSLV-F01||1950|
|4.||GSAT-4||15 April 2010||GSLV-D3||2220|
|5.||GSAT-5P||25 December 2010||GSLV-F6||2310|
|7.||GSAT-7 (INSAT-4F)||30 August 2013||Ariane 5ECA||2330|
|8.||GSAT-8 (INSAT-4G)||20 May 2011||Arian3 5ECA VA202||3093|
|10.||GSAT-10||29 September 2012||Ariane 5ECA||3435|
|12.||GSAT-12||15 July 2011||PSLV-XL-C17||1412|
|14.||INSAT-3D||26 July 2013||Ariane 5ECA||2330|
|15.||GSAT-14||To be launched||GSLV-D5||2050|
|17.||GSAT-16||To be launched||TBD||3100|