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Current Affairs – 17-12-2018

Military communication satellite to be launched on December 19.

  • It is a Military communication satellite
  • Although all Indian communication satellites offer capacity to the armed forces, GSAT-7A will be the first one built primarily for the Indian Air Force (IAF) to qualitatively unify its assets and improve combined, common intelligence during operations.
  • This new space-based dimension adds color to the way the Indian Air Force interlinks, operates and communicates with its aircraft as they fly and with command centres on ground
  • This satellite using Ku bandwill enable superior real time aircraft-to-aircraft communication; and between planes that are in flight and their commanders on the ground.
  • It will also support aerial activities of the Army and the Navy when required.
  • The GSAT-7A incorporates Chemical Propulsion Systemto provide an operational mission life of a minimum of eight years.
    • Chemical propulsion will be used for orbit raising as well as for on orbit attitude correction
    • Sufficient redundancy is built into the Spacecraft for continued service.

Context

  • The Geosynchronous Satellite Launch Vehicle – F11 (GSLV-F11), will undertake its 13th flight carrying the 35th Indian Communication satellite GSAT-7A built by the ISRO.
  • It will place the 2,250-kg GSAT-7A communication satellite into a geosynchronous transfer orbit.

GSLV – F11

It is ISRO’s fourth generation launch vehicle with three stages.

  • The four liquid strap-ons and a solid rocket motor at the core form the first stage.
  • The second stage is equipped with high thrust engine using liquid fuel.
  • The Cryogenic Upper Stage forms the third and final stage of the vehicle.

Significance

  • It would enhance by many times the coveragenow provided by ground communication systems such as radars and stations of the Army.
  • Out-of-sight and remote areas where ground infrastructure and signals are difficult would get into the critical information loop.
  • The satellite is expected to help the IAF interconnect with various ground radar stations, airbases and AWACS (Airborne Warning And Control System) aircraft.
  • Pilots can communicate much better with headquarters while they fly. Headquarters can receive data in real time.
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