Sriharikota (Andhra Pradesh), Oct 30 (PTI) The 24-hour countdown for the launch of India’s next-generation navigation satellite, NVS-03, has commenced and is progressing, ISRO said on Friday.
The Geosynchronous Satellite Launch Vehicle carrying the navigation satellite on board is scheduled to lift off at 11.51 pm on Friday from the second launch pad at the Satish Dhawan Space Centre (SDSC-SHAR).
The countdown officially commenced at 11.51 pm on Thursday.
The 50-metre-tall, three-stage rocket with a lift-off mass of 420 tonne aims to deploy the 2,232 kg NVS-03 satellite into a Geosynchronous Transfer Orbit (GTO).
According to the mission brochure released by ISRO, the targeted orbit has a planned perigee (closest point to Earth) of 170 km and an apogee (farthest point) of 37,023 km, at an inclination of 20.75 degrees.
In an unprecedented engineering configuration cleared during the Mission Readiness Review (MRR), ISRO will fly the NVS-03 satellite with its pyrotechnic (pyro) valves already open. This major departure from standard safety protocols — which usually isolate spacecraft propellant during the intense vibrations of liftoff — is specifically designed to bypass the connector failure that stranded the previous NVS-02 mission in January 2025.
To further ensure GSLV-F18 success, corrective measures recommended by a high-level committee to enhance redundancy and improve pyro system operations have been fully integrated into this flight, sources said.
NVS-03 is a crucial addition to the Navigation with Indian Constellation (NavIC) system. The satellite carries an indigenous Rubidium atomic clock developed by the Space Applications Centre and will transmit signals in the L1, L5, and S bands. The inclusion of the L1 band ensures compatibility with modern civilian smartphone chipsets and wearable devices.
Following the injection into GTO, the satellite will perform orbit-raising manoeuvres to reach its final Geosynchronous slot at 32.5 degrees East.
While Friday’s launch is a critical step in restoring and strengthening the country’s regional positioning services, experts point out that the broader NavIC constellation still has a significant distance to cover before realising its full operational potential and continuous reliability across the grid.
The space agency will be closely monitoring the performance of the GSLV Mk II, looking to execute a flawless flight and shake off the launch vehicle’s historical “naughty boy” moniker stemming from the complexities of its cryogenic third stage. PTI JR KH
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