INSAT-4E, also known as GSAT-6, is a member of the INSAT family and is a multimedia communication satellite that will offer a Satellite Digital Multimedia Broadcasting (S-DMB) service across several digital multimedia terminals or consoles which can be used to provide information services to vehicles on the fly and to the mobile phones. The satellite can be used for other social and strategic applications.
|Mission duration||Planned: 9 years |
Elapsed: 6 years, 1 month, 20 days
|Manufacturer||ISRO Satellite Centre|
Space Applications Centre
|Launch mass||2,117 kilograms (4,667 lb)|
|Dry mass||985 kg (2,172 lb)|
|Start of mission|
|Launch date||27 August 2015, 11:22UTC|
|Rocket||GSLV Mk.II D6|
|Launch site||Satish Dhawan SLP|
|Band||5, C x S transponders (9 megahertz bandwidth)|
5, S x C transponders (2.7 megahertz bandwidth)[clarification needed]
INSAT-4E has five C x S transponders each of 9 MHz bandwidth and five S x C transponders each of 2.7 MHz bandwidth which will together cover the entire country. GSAT-6 uses a 0.8 meter (fixed) and one 6 meter S-Band unfurlable antenna (transmit and receive).
The unfurlable antenna weighing 18 kg has CFRP truss construction with aluminium alloy joints and its parabolic gold plated molybdenum mesh is supported and shaped by cable mesh structures.
GSAT-6 is identical in configuration to GSAT-6A which was launched later.
ISRO successfully launched INSAT-4E on 27 August 2015, using a GSLV D6 Mk.II rocket flying from the Satish Dhawan Space Centre and inserted into a Geostationary Transfer Orbit (GTO) with injection parameters of 170 km x 35945 km, 19.96 degree inclination.
Maneuvers to move the satellite into its designated geosynchronous orbit at 83 degrees East longitude were initiated on 28 August 2015 by firing motors on board the GSAT-6 satellite.
The GSAT-6 satellite's Liquid Apogee Motor (LAM) was fired for 3385 seconds at 08:35 hours IST on August 28 during the first orbit raising operation and modified the satellite orbit to 8,408 km (perigee height) by 35,708 km (apogee height) with an inclination of 7.5 degree and an orbital period of 13 hours, 15 minutes and 24 seconds.
Second orbit raising operation of GSAT-6 was successfully completed by firing the Apogee Motor for 2663 seconds at 11:10:53 hours IST on Aug 29, 2015. Realized orbit was 26,998 km (perigee height) by 35,682 km (apogee height) with an inclination of 0.115 degree and an orbital period of 20 hours and 15 minutes.
Third orbit raising operation of GSAT-6 was successfully completed by firing the Apogee Motor for 580.32 seconds at 07:46 hours IST on Aug 30, 2015. Deployment of the unfurlable antenna (UFA) also successfully completed with this. The satellite was at 78 degrees east longitude and was drifting towards its final slot at 83 degrees east.
GSAT-6 was successfully positioned in its orbital slot of 83 degree east and collocated with INSAT-4A, GSAT-12, GSAT-10 and IRNSS-1C on September 6, 2015 morning, after carrying out four drift arresting maneuvers.
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