Science & TechnologyImportant2025-11-02

ISRO Launches Heaviest Military Satellite CMS-03

Q: Which of the following statements regarding the CMS-03 (GSAT-7R) satellite is/are correct? 1. It is a dedicated military communication satellite launched primarily for the Indian Air Force. 2. It was launched using the Launch Vehicle Mark-3 (LVM3) and is the heaviest satellite launched from Indian soil.

b) 2 only — Statement 1 is incorrect because CMS-03 (GSAT-7R) is dedicated to the Indian Navy, replacing the older GSAT-7 (Rukmini), while GSAT-7A is for the Air Force. Statement 2 is correct as it weighs 4,400 kg and was launched aboard the LVM3 rocket, making it the heaviest launched by ISRO from India.

In News

What Happened

On November 2, 2025, the Indian Space Research Organisation (ISRO) successfully launched the 4,400 kg CMS-03 (GSAT-7R) communication satellite. The launch was carried out using the Launch Vehicle Mark-3 (LVM3-M5) rocket from the Satish Dhawan Space Centre in Sriharikota, placing the satellite into a Geosynchronous Transfer Orbit. CMS-03 is a dedicated strategic military satellite designed to replace the older GSAT-7 (Rukmini) spacecraft.

Why It Matters

This launch significantly enhances the operational communication capabilities of the Indian Navy by providing secure, real-time links across wide maritime zones. Furthermore, weighing 4,400 kg, it marks a major milestone as the heaviest satellite ever launched by ISRO from Indian soil, proving the heavy-lift maturity of the LVM3 rocket.

Background

History & Context

The Indian Navy's reliance on dedicated space assets began with the launch of GSAT-7 (Rukmini) in 2013, which was India's first dedicated military communication satellite. As Rukmini approached the end of its operational life, the Defence Acquisition Council (DAC) approved the procurement of a replacement satellite, GSAT-7R, to maintain continuous maritime surveillance and communication. The GSAT-7 series also includes GSAT-7A, launched in 2018 for the Indian Air Force, highlighting India's expanding dual-use and military space architecture.

What Changed

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Weight Capacity: BEFORE, ISRO often relied on foreign space agencies like Arianespace to launch satellites heavier than 4,000 kg. NOW, ISRO can launch payloads up to 4,400 kg using its indigenous LVM3 rocket from Sriharikota.
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Naval Communication: BEFORE, the Indian Navy relied on the aging GSAT-7 (Rukmini) satellite which was reaching the end of its mission life. NOW, the Navy has access to the upgraded CMS-03 (GSAT-7R) satellite for superior, secure, and uninterrupted maritime communication.
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Strategic Coverage: BEFORE, legacy systems offered limited bandwidth for blue-water naval operations. NOW, CMS-03 provides enhanced transponders, allowing faster real-time networking of warships, submarines, and aircraft across the Indian Ocean Region.

Prelims Angle

NCERT Connection

This event directly connects to Class 11 Physics Chapter 8 - Gravitation, which explains the principles of artificial satellites, orbital velocity, and geostationary orbits. The CMS-03 satellite was injected into a Geosynchronous Transfer Orbit, requiring precise orbital mechanics and escape velocity calculations discussed in this chapter to ensure it eventually reaches its final geostationary position.

Practice Questions

Q1

Correct Statement(s)

Which of the following statements regarding the CMS-03 (GSAT-7R) satellite is/are correct? 1. It is a dedicated military communication satellite launched primarily for the Indian Air Force. 2. It was launched using the Launch Vehicle Mark-3 (LVM3) and is the heaviest satellite launched from Indian soil.

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