ISRO launches GSLV-F18 rocket carrying NVS-03 navigation satellite

UPDATE - follow-up to ISRO set to launch GSLV-F18 carrying navigation satellite NVS-03 | LIVE: The Indian Space Research Organisation launched the GSLV-F18 rocket carrying the 2,250-kg NVS-03 satellite from the Satish Dhawan Space Centre at Sriharikota.

Mission Details

This flight marks ISRO's third space launch of 2026. The rocket is scheduled to deploy the satellite into its initial Geosynchronous Transfer Orbit about 18 minutes and 40 seconds after liftoff from the Second Launch Pad. ISRO will use onboard thrusters to raise the satellite to its designated orbit.

Satellite Payload

The NVS-03 satellite carries an indigenous atomic clock along with procured atomic clocks. It also features the L1 signal alongside existing L5 and S-band signals to boost NavIC services. NavIC serves as India's local alternative to systems like the U.S. GPS, Russia's GLONASS, and China's BeiDou.

Constellation Status

Restoring NavIC to minimum capacity requires launching at least two more NVS-series satellites, NVS-04 and NVS-05, following NVS-01 and NVS-03. Government data shows only three of the constellation's 11 satellites currently perform primary functions, including IRNSS-1B, IRNSS-1I, and NVS-01, while NVS-02 suffered engine failures.

Context

Satellite navigation constellations require multiple backup units in orbit to maintain uninterrupted civilian and military services if older spacecraft fail. India's regional network aims to reduce dependence on foreign GPS systems for domestic positioning and timing needs.