The GSAT satellites are India's indigenously developed communications satellites, used for digital audio, data and video broadcasting. As of 30 March 2018, 18 GSAT satellites of ISRO have been launched out of which 13 satellites are currently in service.
The GSAT series of geosynchronous satellites is a system developed by ISRO with an objective to make India self-reliant in broadcasting services. The repertoire of 10 GSAT satellites, a total of 168 transponders (out of which 95 transponders are leased out to provide services to the broadcasters) in the C, Extended C and Ku-bands provides services to telecommunications, television broadcasting, weather forecasting, disaster warning and search and rescue operations.
List of satellites
This is a list of GSAT satellites with their outcome.
|Satellite||Longitude||Date of launch||Launch vehicle||Lift-off mass||Status||Notes|
|GSAT series||INSAT series||Known as|
|GSAT-1||-||GramSat 1||73° West (2000)
99° West (2000—2006)
76.85° West (2006—2009)
|18 April 2001||GSLV Mk.I D1||1,540 kg (3,400 lb)||Failed to orbit
|Envisaged as a technology demonstrator; Failed to achieve its target orbit, which prevented it from fulfilling its primary communications mission.|
|GSAT-2||-||GramSat 2||47.95° East||8 May 2003||GSLV Mk.I D2||1,825 kg (4,023 lb)||Decommissioned
|Experimental communication satellite on board the second developmental test flight of India's GSLV.|
|GSAT-3||-||EduSat||74° East||20 September 2004||GSLV Mk.I F01||1,950 kg (4,300 lb)||Decommissioned
(30 September 2010)
|Built exclusively to serve the educational sector. It was mainly intended to meet the demand for an interactive satellite-based distance education system for the country.|
|GSAT-4||-||HealthSat||82° East||15 April 2010||GSLV Mk.II D3||2,220 kg (4,890 lb)||Failed to orbit||Experimental communication and navigation satellite; maiden flight of the GSLV Mk.II rocket.|
|GSAT-5||INSAT-4D||GSLV Mk.II||2,250 kg (4,960 lb)||Cancelled||Rebuilt as the GSAT-5P.|
|GSAT-5P||-||55° East||25 December 2010||GSLV Mk.I F06||2,310 kg (5,090 lb)||Failed to orbit||As a replacement for INSAT-3E.|
|GSAT-6||INSAT-4E||83° East||27 August 2015||GSLV Mk.II D6||2,132 kg (4,700 lb)||In Service||A multi-media mobile satellite system; will offer a Satellite Digital Multimedia Broadcasting (S-DMB) service, via mobile phones and mobile video/audio receivers for vehicles; Can also be utilized for strategic and social applications.|
|GSAT-6A||-||29 March 2018||GSLV Mk.II F08||2,140 kg (4,720 lb)||Communication Lost||Communication with the satellite was lost after the second orbit raising manoeuvre. Efforts are on to re-establish link but at this point it remains incommunicado.|
|GSAT-7||INSAT-4F||74° East||30 August 2013||Ariane 5 ECA VA-215||2,650 kg (5,840 lb)||In Service||According to defense experts, to enable the Indian Navy to acquire blue water capabilities and need not depend on foreign satellites like Inmarsat, which provide communication services to its ships.|
|GSAT-7A||-||2018 (planned)||GSLV Mk.II F11||Planned||GSAT-7A is an advanced military communications satellite meant exclusively for the Indian Air Force.|
|GSAT-8||INSAT-4G||GramSat 8||55° East||20 May 2011||Ariane 5 ECA VA-202||3,093 kg (6,819 lb)||In Service||To augment the capacity in the INSAT system; The GAGAN payload provides the Satellite Based Augmentation System (SBAS), through which the accuracy of the positioning information obtained from the GPS Satellite is improved by a network of ground-based receivers and made available to the users in the country through the geostationary satellites.|
|GSAT-9||-||South Asia Satellite||48° East||5 May 2017||GSLV Mk.II F09||2,330 kg (5,140 lb)||In Service||Will carry GAGAN navigation payload, a regional GPS navigational system developed by India, that will provide GPS services to the security forces and air traffic control organizations.|
|GSAT-10||-||83° East||29 September 2012||Ariane 5 ECA VA-209||3,435 kg (7,573 lb)||In Service||To augment telecommunication, Direct-To-Home and radio navigation services.|
|GSAT-11||-||74° East||30 November 2018(Planned)||Ariane 5 ECA||5,725 kg (12,621 lb)||Planned||Aimed at providing advanced telecom and DTH services in the country. Heaviest satellite build by India.|
|GSAT-12||-||GramSat 12||83° East||15 July 2011||PSLV-XL C17||1,412 kg (3,113 lb)||In Service||Replacement of the INSAT-3B; to provide services like tele-education, tele-medicine, disaster management support and satellite internet access. Only GSAT satellite to be launched by PSLV.|
|GSAT-14||-||75° East||5 January 2014||GSLV Mk.II D5||1,982 kg (4,370 lb)||In Service||To replace the GSAT-3 satellite; launched by a GSLV Mk.II, which incorporated an Indian-built cryogenic engine on the third stage.|
|GSAT-15||-||93.5° East||10 November 2015||Ariane 5 ECA VA-227||3,100 kg (6,800 lb)||In Service||Similar to GSAT-10 satellite; to augment the capacity of transponders to provide more bandwidth for Direct-to-Home television and VSAT services.|
|GSAT-16||-||55° East||6 December 2014||Ariane 5 ECA VA-221||3,150 kg (6,940 lb)||In Service||The communication payloads provide a combination of total 48 transponders across the three frequency bands (24-Normal C, 12-Extended-C and 12 in Ku-band) along with a Ku-band beacon transmitter, which is the highest for an Indian satellite. The spacecraft will be Co-located with GSAT-8 at 55 deg E.|
|GSAT-17||-||93.5° East||28 June 2017||Ariane 5 ECA VA-238||3,477 kg (7,551 lb)||In Service||Payload includes 24 C-band, 2 lower C-band, 12 upper C-band, 2 CxS (C-band up/S-band down), and 1 SxC (S-band up/C-band down) transponders as well as a dedicated transponder for data relay (DRT) and search-and-rescue (SAR) services.|
|GSAT-18||-||74° East||5 October 2016|| Ariane 5 ECA
|3,404 kg (7,505 lb)||In Service||to provide services in Normal C-band, Upper Extended C-band and Ku-bands of the frequency spectrum.|
|GSAT-19||-||48° East||5 June 2017||GSLV Mk.III D1||3,136 kg (6,914 lb)||In Service||First maiden (developmental) flight of GSLV Mark III|
|GSLV Mk.III||3,650 kg (8,050 lb)||Planned|
|GSAT-22||-||2019 (planned)||GSLV Mk.III||Planned|
|GSAT-23||-||2020 (planned)||GSLV Mk.III||Planned|
|GSAT-24||-||2020 (planned)||GSLV Mk.III||Planned|
|GSAT-29||-||2018 (planned)||GSLV Mk.III D2||3,500 kg (7,700 lb)||Planned||Second developmental flight of GSLV Mark III|
- Polar Satellite Launch Vehicle (PSLV)
- Geosynchronous Satellite Launch Vehicle (GSLV)
- List of Indian satellites
- List of Satish Dhawan Space Centre launches
- "GSAT 1". NASA. 16 August 2013. Retrieved 6 January 2014.
- "GSAT 2". NASA. 16 August 2013. Retrieved 6 January 2014.
- "GSat 5 (Insat 4D)". Gunter's Space Page. 29 March 2017. Retrieved 22 May 2017.
- "GSAT 7". NASA. 16 August 2013. Retrieved 6 January 2014.
- "GSAT 8". NASA. 16 August 2013. Retrieved 6 January 2014.
- "GSAT 10". NASA. 16 August 2013. Retrieved 6 January 2014.
- "GSAT 12". NASA. 16 August 2013. Retrieved 6 January 2014.
- "Ariane 5 delivers DIRECTV-14 and GSAT-16 to orbit on Arianespace's latest mission success". Archived from the original on 11 December 2014. Retrieved 7 December 2014.
- "Annual Report 2015-2016" (PDF). Indian Space Research Organisation. December 2015. p. 28. Archived from the original (PDF) on 2016-07-05.
- "Now, ISRO successfully puts GSAT-19 satellite in orbit with GSLV Mk-III". The New Indian Express. Retrieved 5 June 2017.
- "GSat 20". Gunter's Space Page. 2 June 2017. Retrieved 2 June 2017.
- "GSAT 22/23/24". Indian Defense News. 25 April 2017. Retrieved 16 February 2018.
- "GSAT 29". ISRO. 16 February 2018. Retrieved 16 February 2018.
- "GSAT-18 launched successfully on board Ariane-5 from Kourou in French Guiana". 2016-10-06. Retrieved 2016-10-06.