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Date: 31 August 2014
India’s latest telecommunications satellite Insat-4B launched into orbit
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India’s latest telecommunications satellite Insat-4B launched into orbit :: 14 March, 2007


   
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India’s latest telecommunications satellite successfully blasted off on the back of an Ariane-5 rocket from Kourou, French Guyana, in the early hours of this morning, boosting Direct-to-Home television services. Insat-4B shot up to space alongside a British military satellite.
A technical hitch delayed the launch by 24 hours, however today’s operation went smoothly and the Indian Space Research Organisation announced the Master Control Facility (MCF) at Hassan in Karnataka picked up the first signals from Insat-4B minutes after blast off.
The Rs 210 crore, 3,025kg satellite is the second in the INSAT-4 series. An identical satellite, INSAT-4A, was launched by Ariane-5 on December 22, 2005.
Insat-4B is carrying as payload 12 Ku-band 36 MHz and 27 MHz usable bandwidth transponders (nine and three, respectively). Alongside are 12 C-band 36 MHz bandwidth transponders with expanded coverage encompassing the Indian geographical boundary. With the addition of Insat-4B, the communication capacity of the Insat system, cumulatively, will go up to 199 transponders.
Established in 1983, the Indian National Satellite System is the largest domestic communication satellite system in Asia Pacific with nine satellites in operation.
It provides services in telecommunication, television broadcasting and meteorology including disaster warning, tele-education and tele-medicine. There are currently 175 transponders to cover communication services besides meteorological instruments (a high-resolution radiometer and charged coupled device cameras) for providing meteorological data. The satellite measures 15.4m once activated in orbit. It has two solar arrays together generating 5,860 watts backed up by three 100 lithium-ion Batteries. This is in addition to two deployable antennas to transmit and receive functions.
Insat-4B is currently orbiting the earth its nearest point at 243km and the farthest point at 35,876km and an inclination of 4.52 degrees towards the equator. The orbital period is about 10 hours 34 minutes.
The satellite is being tracked, monitored and controlled from MCF. During the initial phase operations, MCF will use INMARSAT organisation’s telemetry, tracking and command ground stations in Beijing,China, Fucino, Italy and Lake Cowichan,Canada, as well as the Isro’s telemetry, tracking and command network station in Biak, Indonesia.
In the coming days, Insat-4B will be moved to its final geostationary orbit, about 36,000km above the equator, by firing its 440 Newton Liquid Apogee Motor.
The Isro Satellite Centre in Bangalore, was lead centre, with major contributions on Insat-4B from Space Applications Centre, Ahmedabad, Liquid Propulsion Systems Centre at Valiamala and Bangalore, Vikram Sarabhai Space Centre and Isro Inertial Systems Unit in Thiruvananthapuram and the Laboratory for Electro Optic Sensors in Bangalore. Several industries in public and private sectors have also contributed to the project.

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net work
Posted by: of east 15 September, 2009 01:25

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