In news– The Defence Acquisition Council (DAC) headed by the Defence Minister has given the Acceptance of Necessity (AoN) for procurement of a GSAT 7B satellite recently.
About GSAT 7B satellite–
- It is the state of the art, multi-band, military-grade satellite that will primarily fulfill the communication needs of the Army.
- Currently, the Army is using 30 percent of the communication capabilities of the GSAT 7A satellite, which has been designed for the Indian Air Force (IAF).
- It will also help the Army enhance its surveillance in border areas.
Other GSAT series satellites-
GSAT 7 satellite:
- GSAT 7 satellites are advanced satellites developed by the ISRO to meet the communication needs of the defence services.
- It was launched in August 2013 from an Ariane 5 ECA rocket from Kourou in French Guiana.
- It is a 2,650 kg satellite which has a footprint of nearly 2,000 nautical miles in the Indian Ocean region.
- This satellite is mainly used by the Indian Navy for its communication needs.
- It provides a gamut of services for military communication needs, which includes low bit voice rate to high bit rate data facilities, including multi-band communications.
- Named Rukmini, the satellite carries payloads in UHF, C-band and Ku-band, and helps the Navy to have a secure, real time communication link between its land establishments, surface ships, submarines and aircraft.
- The satellite was injected into a geosynchronous transfer orbit (GTO).
GSAT 7A (Indian Angry Bird):
- The GSAT 7A was launched in 2018 from the Satish Dhawan Space Centre in Sriharikota, and has gone a long way in boosting the connectivity between the ground radar stations, airbases and the airborne early warning and control aircraft (AEW&C) of the IAF.
- It also helps in satellite controlled operations of unmanned aerial vehicles (UAVs) which gives a great deal of reliability to the operations as compared to ground controlled operations.
- This satellite has 10 channels in Ku band with switchable frequency for mobile users, one fixed Gregorian or parabolic antenna, and four steerable antennae.
GSAT 7C satellite:
- It is on the cards for the IAF, and a proposal to this effect was cleared by the DAC in 2021.
- This satellite would facilitate real time communication with IAF’s software defined radio communication sets.
- It will increase the capability of the IAF to communicate beyond the line of sight in a secure mode.
Other kinds of military satellites of India-
An Electromagnetic Intelligence Gathering Satellite (EMISAT)-
- EMISAT was developed by ISRO, and was launched in April 2020 through a Polar Satellite Launch Vehicle (PSLV-C45).
- It has an Electronic Intelligence (ELINT) package called Kautilya, which allows the interception of ground-based radar and also carries out electronic surveillance across India.
- The ELINT package provides the capability in direction-finding of radar and fixing their locations.
- It is placed in a 748-km orbit, and is said to be based on the Israeli satellite system.
- This satellite circles the globe pole-to-pole, and is helpful in gathering information from radars of countries that have borders with India.
RISAT 2BR1 synthetic aperture radar imaging satellite-
- It was launched in December 2019 from Sriharikota.