ISRO’s NVS-03 launch: How a third Indigenous atomic clock will strengthen India’s navigation capabilities
The earlier satellites, NVS-01 and NVS-02, carried the other two indigenous atomic clocks. NVS-03 will add another such clock to the system.
Published: Oct 30, 2026, 11:22 PM IST
| Updated: Oct 30, 2026, 11:41 PM IST
The earlier satellites, NVS-01 and NVS-02, carried the other two indigenous atomic clocks. NVS-03 will add another such clock to the system.
India is set to strengthen its independent satellite navigation capabilities with the launch of the Indian Space Research Organisation’s (ISRO) NVS-03 satellite, which will carry a third indigenous atomic clock into space and reinforce the country’s control over its navigation and timekeeping infrastructure.
Scheduled for 11.51 pm on Friday, the GSLV-F18/NVS-03 mission is expected to mark a significant step towards restoring the full operational capability of India’s Navigation with Indian Constellation (NavIC) system.
Former Defence Research and Development Organisation (DRDO) scientist Ravi Gupta described the launch as a major milestone, saying the addition of the satellite would help restore NavIC’s operational capability after technical interruptions.
“Today is going to be a very momentous day for our country because our NavIC (Navigation with Indian Constellation) system, which got obstructed because of some technical reasons for some time, is now going to become operational again. Navigation is an important part of any peacetime activity as well as war activity,” Gupta told ANI.
The launch is scheduled to take place from the Second Launch Pad at the Satish Dhawan Space Centre (SDSC SHAR) in Sriharikota.
Why NVS-03 matters for India’s navigation system
NVS-03 is the third satellite in the next-generation navigation system designed to ensure continuity of services under the Indian Regional Navigation Satellite System (IRNSS), now known as NavIC.
The satellite will be carried by the GSLV-F18 launch vehicle, marking the 20th flight of India’s Geosynchronous Satellite Launch Vehicle (GSLV).
The earlier satellites, NVS-01 and NVS-02, carried the other two indigenous atomic clocks. NVS-03 will add another such clock to the system.
Gupta said the satellite would help restore NavIC’s operational capability, which is particularly important for India’s defence requirements.
“During a war, the importance of accurate navigation becomes extremely important because all our missiles, aircraft, submarines, and ships depend on the navigation system. This will be the fourth satellite. Once it’s in place in orbit, our own navigation system will become completely operational,” he said.
He also pointed to the risks of depending on foreign navigation services such as GPS and GLONASS, particularly when access could be restricted during a crisis.
“So far, we are dependent on GPS, GLONASS, or any other commercially available systems, which we’ve observed that sometimes, when we are in a critical moment, access to these systems was denied - denied directly or by excuse of some glitch,” Gupta said.
Third Indigenous atomic clock to strengthen time sovereignty
The NVS-03 satellite will carry an indigenous atomic clock alongside procured atomic clocks. It will also introduce the L1 signal, in addition to the existing L5 and S signals.
According to ISRO, the satellite will provide coverage over India’s landmass and a region extending 1,500 km beyond the country’s geopolitical boundary.
An atomic clock is among the world’s most accurate timekeeping devices. Unlike pendulum-based clocks or quartz crystal systems, which can drift or be affected by temperature changes, atomic clocks measure time using the natural and stable vibrational frequency of atoms, most commonly cesium-133.
The technology is central to satellite navigation, where precise timing is essential for calculating the position of users on the ground.
India’s NavIC system is an independent regional navigation satellite system developed to provide accurate position information to users across the country and the surrounding region extending up to 1,500 km from its boundary.
The launch of NVS-03 is expected to strengthen India’s ability to maintain its own navigation services without relying entirely on foreign systems.
‘One Nation, one time’ push
The mission also aligns with the Centre’s “One Nation, One Time” initiative, which seeks to establish Indian Standard Time (IST) as the country’s common and legally recognised time reference.
The Central government notified the Legal Metrology (Indian Standard Time) Rules, 2026, on August 29, marking a significant step towards ensuring a uniform and traceable time standard across India.
The rules will come into force 180 days after their publication in the Official Gazette.
The initiative is aimed at ensuring that critical sectors and digital systems across the country operate using a common and reliable time reference.
According to the Ministry of Science and Technology, accurate and synchronised time is fundamental to modern digital and critical infrastructure.
Telecommunications, financial transactions, digital payments, power grids, transport systems, data centres, government information systems and other essential services depend on precise time synchronisation and reliable timestamps.
The addition of an indigenous atomic clock to NavIC is expected to strengthen this infrastructure and support India’s broader goal of time sovereignty.
DRDO, ISRO work towards self-reliance
Gupta said India had made considerable progress in developing indigenous capabilities for satellite navigation, crediting DRDO and ISRO for their work.
“I’m glad to tell you that our country’s DRDO and ISRO have done a considerable amount of work in this area. We are completely self-reliant in this area. And this system is going to be a robust and very reliable system,” he said.
He also stressed the importance of maintaining control over the supply chain and design of critical components used in navigation infrastructure.
“The important aspect of this kind of system is that the components which are going into this system, we should have complete control over the supply chain; of course, the design has to be ours. And then, if we’re including any system, we should have the capability to examine them and inspect them, so that we can completely depend on them and rely on them,” Gupta said.
The NVS-03 mission is expected to strengthen India’s indigenous navigation capabilities while supporting the continuity of NavIC services for civilian and strategic applications.
(with agencies input)
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