ISRO's GSLV-F18 places navigation satellite NVS-03 in orbit; NavIC reported restored to four satellites

The Indian Space Research Organisation (ISRO) launched the navigation satellite NVS-03 on a GSLV rocket at 11:51 pm IST on Friday, 30 October, from the Satish Dhawan Space Centre in Sriharikota, per The Tribune, The Siasat Daily, Organiser and Business Today. This piece is as of the evening of 31 October.

The launch

The Tribune says the 50-metre-tall GSLV lifted off after a 24-hour countdown and that, after a flight of about 18 minutes in which all three stages including the cryogenic upper stage performed, NVS-03 separated and was injected into a geosynchronous transfer orbit. The Hindu also reports the satellite was placed in the intended orbit 18 minutes after liftoff, while Business Today says the automated sequence took under 19 minutes and gives the achieved orbit as 170.3 km at perigee and 38,080 km at apogee, while The Tribune and The Siasat Daily give the planned orbit as a perigee of 170 km and an apogee of 37,023 km. The Siasat Daily says it was the GSLV's 20th flight and quotes Narayanan saying the mission was done with the least turnaround time of 56 days between successive GSLV missions; Business Today gives the same 56-day figure after the previous launch, GSLV-F17/EOS-05.

What NVS-03 does

The Tribune and The Siasat Daily say NavIC, India's regional navigation system, was restored to its minimum operational configuration of four satellites, and that the second-generation NVS-03, with indigenous and procured atomic clocks, supports civilian uses such as real-time tracking of trains, vehicles and ships. Narayanan said three satellites including NVS-01 were already working and that NVS-03 restored Position, Navigation and Timing services, and that NavIC is an important component of a "one nation, one time" project, per The Tribune. Organiser says NVS-03 carries an indigenous atomic clock alongside procured clocks and adds the L1 signal to the existing L5 and S-band signals, which it says should improve compatibility with a wider range of civilian and commercial receivers. Business Today calls it the twelfth satellite in the IRNSS series and third in the second-generation fleet.

Background

Organiser says NVS-02 was placed in transfer orbit in January 2025 but a propulsion valve issue hindered its orbit-raising, and that ISRO modified the activation sequence of NVS-03's propulsion valves before flight. It gives the satellite's mass as about 2,250 kg in one passage and 2,232 kg in another; Business Today says 2,250 kg, while The Tribune and The Siasat Daily say 2,232 kg. Organiser adds that the satellite must complete its orbit-raising manoeuvres and checks before commissioning. Prime Minister Narendra Modi congratulated ISRO on X, saying the mission was an important step in strengthening NavIC, per The Tribune.