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ISRO Missions and Discoveries

ISRO’s LVM3 Rocket launches GSAT-7R

Why in the News?

The Indian Space Research Organisation (ISRO) has successfully launched the GSAT-7R (CMS-03) communication satellite for the Indian Navy from the Satish Dhawan Space Centre, Sriharikota.

Back2Basics: Launch Vehicle Mark-3 (LVM3) Rocket  

  • Overview: LVM3 formerly GSLV Mk-III, is ISRO’s heaviest and most powerful launch vehicle, built to lift 4-tonne GTO and 8-tonne LEO payloads.
  • Configuration: A 3-stage system – (1) S200 solid boosters, (2) L110 liquid core (UH25 + NO), and (2) C25 cryogenic upper stage (LH + LOX) providing high thrust and precision.
  • Payload Capacity: Delivers ~4,000 kg to GTO and ~8,000 kg to LEO; GSAT-7R demonstrated >4,400 kg capability, setting a new record.
  • Mission Legacy: Successfully launched Chandrayaan-2, Chandrayaan-3, OneWeb satellites, and Gaganyaan crew module tests.
  • Cryogenic Stage: The C25 engine produces ~20 tonnes thrust; the upgraded C32 stage (22 tonnes thrust) is under development.
  • Future Upgrade: Plans to replace L110 with a semi-cryogenic kerosene–liquid oxygen stage for higher efficiency and lower cost.
  • Reliability & Role: With seven consecutive successes, LVM3 is India’s most dependable heavy launcher and baseline vehicle for Gaganyaan and Bharatiya Antariksh Station missions.
  • Strategic Significance: Establishes India’s complete autonomy in heavy launch capability, strengthening its position in the global space economy.

About GSAT-7R (CMS-03):

  • Overview: An advanced multiband communication satellite developed to strengthen the Indian Navy’s secure communications and maritime domain awareness across the Indian Ocean Region (IOR).
  • Developer & Design: Indigenously designed by ISRO under Aatmanirbhar Bharat, advancing self-reliance in defence space infrastructure.
  • Mass & Orbit: Weighs ~4,410 kg, the heaviest communication satellite launched from Indian soil; inserted into Geosynchronous Transfer Orbit (GTO) before shifting to Geostationary Orbit (~36,000 km).
  • Technical Features: Equipped with secure, high-throughput multiband transponders supporting voice, data, and video links across ships, submarines, and aircraft.
  • Coverage & Capability: Provides pan-Indian Ocean coverage, enabling real-time encrypted communication and Blue Water operational readiness.
  • Strategic Role: Functions as a key node in the Defence Communication Network (DCN), enhancing situational awareness and naval coordination.
  • Predecessor: Succeeds GSAT-7 (Rukmini, 2013) with expanded range, bandwidth, and capacity.
  • Significance: Symbolises India’s move toward indigenous defence satellites, merging space technology and national security.
[UPSC 2018] With reference to India’s satellite launch vehicles, consider the following statements :

1. PSLVs launch the satellites useful for Earth resources monitoring whereas GSLVs are designed mainly to launch communication satellites.

2. Satellites launched by PSLV appear to remain permanently fixed in the same position in the sky, as viewed from a particular location on Earth.

3. GSLV Mk III is a four-stage launch vehicle with the first and third stages using solid rocket motors, and the second and fourth stages using liquid rocket engines.

Which of the statements given above is/are correct?

Options: (a) 1 only * (b) 2 and 3 (c) 1 and 2 (d) 3 only

 

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