ISRO successfully launched GSAT-7R (also designated CMS-03), the heaviest communication satellite launched to Geosynchronous Transfer Orbit from Indian soil, weighing about 4,400 kg, aboard the LVM3-M5 rocket from the Second Launch Pad at Satish Dhawan Space Centre, Sriharikota on November 2, 2025. Placed in geosynchronous transfer orbit, the satellite is dedicated to the Indian Navy, replacing the existing GSAT-7. GSAT-7R transmits voice, video, and data among naval ships, submarines, aircraft, and Maritime Operation Centres across the Indian Ocean Region, covering up to 2,000 km from India's coastline. It employs advanced payloads in multiple frequency bands — UHF, S, C, and Ku bands — providing secure, encrypted, high-bandwidth, real-time communication. The mission also featured a cryogenic upper-stage re-ignition experiment, showcasing India's growing mastery of advanced propulsion. GSAT-7R has a planned lifespan of 15 years and represents a strategic step under the Atmanirbhar Bharat programme in defence space technology. The launch comes amid heightened emphasis on Maritime Domain Awareness (MDA) in the Indo-Pacific region.
ISRO's GSAT-7R (CMS-03) — Heaviest Communication Satellite Launched to GTO from Indian Soil — Successfully Enhances Indian Navy's Maritime Network
ISRO successfully launched GSAT-7R (also designated CMS-03), the heaviest communication satellite launched to Geosynchronous Transfer Orbit from Indian soil, weighing about 4,400 kg, aboard the LVM3-M5 rocket from the Second Launch Pad at Satish Dhawan Space Centre, Sriharikota on November 2, 2025. Placed in geosynchronous transfer orbit, the satellite is dedicated to the Indian Navy, replacing the existing GSAT-7. GSAT-7R transmits voice, video, and data among naval ships, submarines, aircraft, and Maritime Operation Centres across the Indian Ocean Region, covering up to 2,000 km from India's coastline. It employs advanced payloads in multiple frequency bands — UHF, S, C, and Ku bands — providing secure, encrypted, high-bandwidth, real-time communication. The mission also featured a cryogenic upper-stage re-ignition experiment, showcasing India's growing mastery of advanced propulsion. GSAT-7R has a planned lifespan of 15 years and represents a strategic step under the Atmanirbhar Bharat programme in defence space technology. The launch comes amid heightened emphasis on Maritime Domain Awareness (MDA) in the Indo-Pacific region.
Key facts
- ISRO launched GSAT-7R (CMS-03), India's heaviest communication satellite at 4,410 kg, on November 2, 2025.
- Launched aboard LVM3-M5 from Satish Dhawan Space Centre, placed in geosynchronous transfer orbit.
- Dedicated to Indian Navy, replacing GSAT-7, with 15-year operational lifespan.
- Provides secure encrypted communication in UHF, S, C, and Ku bands covering 2,000 km from coastline.
- Cryogenic upper-stage re-ignition experiment showcased India's advanced propulsion mastery.
- Strategic step under Atmanirbhar Bharat for defence space technology and Maritime Domain Awareness.
PYQPrelims/PYQ angle
- RAS 2021 PSLV vs GSLV differences — This PYQ on launch vehicle types directly relates to the LVM3-M5 rocket used for GSAT-7R, testing knowledge of India's satellite launch infrastructure.
Mains angle
Q: Evaluate the strategic significance of ISRO's GSAT-7R satellite for the Indian Navy's maritime communication capabilities and defence self-reliance under the Atmanirbhar Bharat programme.
Answer (50 words):
GSAT-7R, the heaviest communication satellite launched to GTO from Indian soil, weighing about 4,400 kg, launched aboard LVM3-M5 from Sriharikota on November 2, 2025, replacing GSAT-7 for the Indian Navy. It provides encrypted real-time communication across UHF, S, C, and Ku bands covering 2,000 kilometres from India's coastline with a 15-year operational lifespan.
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ISRO's GSAT-7R (CMS-03), described as India's heaviest communication satellite, was launched in November 2025 aboard which rocket?
GSAT-7R weighing 4,410 kg was launched aboard the LVM3-M5 rocket from the Second Launch Pad at Satish Dhawan Space Centre, Sriharikota on November 2, 2025.
Source: PIB / ISRO / Space.com
Frequently asked questions
What is GSAT-7R and why was it launched?
GSAT-7R (also designated CMS-03) is India's heaviest communication satellite, weighing 4,410 kg, launched on November 2, 2025 by ISRO aboard the LVM3-M5 rocket. It was launched to replace the existing GSAT-7 and provide enhanced secure communications for the Indian Navy across the Indian Ocean Region.
Which rocket launched GSAT-7R and from which launch pad?
GSAT-7R was launched aboard the LVM3-M5 rocket from the Second Launch Pad at Satish Dhawan Space Centre (SDSC), Sriharikota, Andhra Pradesh on November 2, 2025. The LVM3 (formerly GSLV Mk III) is ISRO's heaviest operational launch vehicle.
What communication bands does GSAT-7R operate in and what is its coverage area?
GSAT-7R operates in UHF, S, C, and Ku frequency bands, providing secure encrypted communication among naval ships, submarines, aircraft, and Maritime Operation Centres. It covers approximately 2,000 km from India's coastline, encompassing the entire Indian Ocean Region.
What was the significance of the cryogenic upper-stage re-ignition experiment during the GSAT-7R launch?
The cryogenic upper-stage re-ignition experiment conducted during the GSAT-7R launch demonstrated India's advanced propulsion capability. Successfully reigniting a cryogenic engine in space is technically complex and is a prerequisite for future deep-space missions, showcasing India's mastery over high-end space propulsion technology.
How does GSAT-7R relate to the Atmanirbhar Bharat initiative?
GSAT-7R represents a strategic step under Atmanirbhar Bharat (Self-Reliant India) in defence space technology. By building a domestic dedicated military communication satellite with 15-year lifespan, India reduces dependence on foreign communication infrastructure, enhances Maritime Domain Awareness, and strengthens its Blue Water Navy capability.
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