ndia's first defence satellite GSAT-7 launched successfully
* India's first exclusive defence satellite GSAT-7 was successfully launched by European space consortium Arianespace's Ariane 5 rocket from Kourou spaceport in French Guiana on 30 August 2013.
* Indian Navy would be the user of the multi-band home-built communication spacecraft, expected to be operational by September end.
* Rs 185-crore GSAT-7, the country's maiden dedicated spacecraft for defence applications, was launched during a 50-minute launch window which started at 2am, and it was telecast live by Doordarshan.
* After a flight of almost 34 minutes, the satellite was injected into a geosynchronous transfer orbit (GTO) of 249 km perigee (nearest point to earth), 35,929 km apogee (farthest point to earth) and an inclination of 3.5 degree with respect to the equator.
* During August 31-September 4, three orbit-raising operations will be performed by Indian Space Research Organisation (ISRO) to place the satellite into geostationary orbit of 36,000 km above the equator.
* By September 14, GSAT-7 is planned to be positioned in its orbital slot of 74 deg East longitude and subsequently the satellite's communication transponders will be switched on.
* The frequency bands of GSAT-7 will help space-based marine communications. It has coverage over India landmass as well as surrounding seas.
* According to ISRO, GSAT-7 is an advanced communication satellite to provide wide range of service spectrum from low bit rate voice to high bit rate data communication. Its payload is designed to provide communication capabilities to users over a wide oceanic region including the Indian land-mass.
* ISRO cannot launch heavy satellites like GSAT-7 as its home-grown GSLV rocket, with indigenous cryogenic stage, is still at works and needs two successful flights before it is declared operational.
courtesy : http://currentaffairs4examz.blogspot.in/
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