ISRO chairman V Narayanan said the new spacecraft would join three functioning satellites, including NVS-01, restoring the constellation’s capacity to provide independent positioning, navigation and timing services. His announcement followed the successful injection of NVS-03 into its designated geosynchronous transfer orbit aboard the GSLV-F18 rocket.
The rocket lifted off at 11.51pm from the second launch pad at the Satish Dhawan Space Centre in Andhra Pradesh. Approximately 18 minutes later, the spacecraft separated in its planned transfer orbit, completing the launch phase of a mission intended to address a shortage of working satellites in the NavIC network. The mission is listed in ISRO’s official launch register as its 107th recorded launch from the coastal Sriharikota spaceport.
Narayanan said the launch vehicle’s systems had performed as predicted and the satellite had been delivered precisely to its designated orbit. The achievement established the minimum constellation needed for independent regional navigation, although deployment into a transfer orbit does not by itself confirm completion of subsequent orbital manoeuvres or operational commissioning.
NavIC, formally Navigation with Indian Constellation, supplies positioning and timing signals over India’s landmass and an area extending approximately 1,500 kilometres beyond its boundaries. Its applications include tracking trains, road vehicles and ships, alongside services requiring accurate time synchronisation.
The chairman described the constellation as a strategic national asset and highlighted its contribution to the government’s One Nation, One Time initiative, which seeks greater consistency in national timekeeping. He said three satellites were already functioning before Friday’s launch, making NVS-03 particularly important for the network’s minimum operating strength.
The successful launch also marks a significant recovery from difficulties encountered with NVS-02, which was launched in January 2025 but could not complete the orbit-raising operations necessary to reach its intended working position. An investigation identified a failure to deliver the electrical command required to operate a valve in the propulsion system.
That setback left the navigation programme facing an additional challenge as ageing spacecraft and failures reduced the number available for reliable service. ISRO subsequently examined the technical problems and introduced corrective measures before proceeding with the next spacecraft in the series.
NVS-03 is the third spacecraft in the next-generation navigation programme, designed to maintain continuity of the original regional satellite system. It carries an atomic clock developed domestically alongside procured clocks, providing the precise timing measurements essential to satellite navigation.
The spacecraft also supports an L1 navigation signal in addition to the L5 and S-band signals used by the system. The additional frequency is intended to improve compatibility with a wider range of navigation receivers, including devices used for civilian positioning applications.
Four functioning satellites constitute the minimum configuration for positioning and navigation calculations, while the wider planned constellation offers additional coverage, redundancy and resilience. Restoring the numerical threshold is therefore an important milestone, but the reliability of services will also depend on the new spacecraft completing its remaining orbital and technical checks.
Friday’s mission was the twentieth flight of the Geosynchronous Satellite Launch Vehicle and the second GSLV mission within 56 days. Narayanan described that interval as the shortest turnaround between successive missions of the rocket, following the September launch of the EOS-05 Earth observation satellite.
He said EOS-05 was functioning properly and supplying high-quality data. The spacecraft’s performance was cited alongside the successful navigation launch as evidence of progress in the agency’s ongoing satellite missions, although the two spacecraft serve different purposes.
The GSLV employs a cryogenic upper stage to place heavier satellites into transfer orbits from which they can subsequently reach their operational positions. For NVS-03, the immediate task was accurate orbital injection, followed by the spacecraft’s own manoeuvres and commissioning activities.
Narayanan also acknowledged the contribution of industrial partners and academic institutions to the launch. He said nearly 80 per cent of the mission budget had gone to domestic industry, underscoring the role of suppliers in manufacturing and supporting the hardware required for the programme.
The spacecraft carries both domestically developed and externally procured atomic clocks, an arrangement intended to support dependable timing signals while expanding local technological capability. Precise onboard clocks are fundamental to determining distances between satellites and receivers, making their performance a central part of the navigation system’s operation.
