NVS-03 Launched: NavIC Back to Four Working Satellites

In news

• ISRO launched NVS-03 on GSLV-F18 from the Second Launch Pad, Satish Dhawan Space Centre, Sriharikota, on 30 October 2026.
• The satellite was placed in a Geosynchronous Transfer Orbit (GTO). It will be raised to its final slot using its own engine.
• It is the third satellite of the NVS series, the second generation of NavIC.

Why it matters

• NavIC needs at least four satellites to give a position fix.
• It had fallen below this level after the last atomic clock on IRNSS-1F stopped in March 2026.
• With NVS-03, the working satellites are IRNSS-1B, IRNSS-1I, NVS-01 and NVS-03.
• The full constellation needs seven satellites.

NVS-03 at a glance

Feature	Detail
Launch vehicle	GSLV-F18 (20th GSLV flight)
Atomic clock	Indigenous rubidium clock (iRAFS) plus procured clocks
Signals	L5 and S bands, plus the new L1 band
Coverage	India and about 1,500 km beyond its boundary
Lesson from NVS-02	Pyro valves opened on the ground to avoid an in-flight valve failure

What is NavIC

• NavIC (Navigation with Indian Constellation) is India's regional navigation satellite system. Its technical name is IRNSS.
• It was approved in 2006. The name NavIC was given in 2016.
• It is designed with 3 satellites in Geostationary Orbit (GEO) and 4 in inclined Geosynchronous Orbit (GSO).
• It offers two services:
  • Standard Positioning Service (SPS) for civilian users.
  • Restricted Service (RS), encrypted, for strategic users.
• Position accuracy is better than 20 m over the primary service area.
• Ground control is at the ISRO Navigation Centre, Byalalu (Karnataka).

The NavIC journey

Satellite	Launch	Vehicle	Status
IRNSS-1A	2013	PSLV-C22	Atomic clocks failed
IRNSS-1B	2014	PSLV-C24	Working
IRNSS-1C	2014	PSLV-C26	Not in navigation service
IRNSS-1D	2015	PSLV-C27	Not in navigation service
IRNSS-1E	2016	PSLV-C31	Not in navigation service
IRNSS-1F	2016	PSLV-C32	Last clock stopped in 2026
IRNSS-1G	2016	PSLV-C33	Not in navigation service
IRNSS-1H	2017	PSLV-C39	Launch failed (heat shield did not separate)
IRNSS-1I	2018	PSLV-C41	Working
NVS-01	2023	GSLV-F12	Working; first indigenous atomic clock
NVS-02	2025	GSLV-F15	Stuck in transfer orbit (valve fault)
NVS-03	2026	GSLV-F18	Launched; joins the working set

Key concepts

• Atomic clocks are the heart of a navigation satellite. A timing error of one nanosecond means about 30 cm of position error.
• The early IRNSS satellites used imported rubidium clocks. Many of them failed.
• The L1 band is used by GPS and most phone chipsets. Adding L1 makes NavIC easier to use in smartphones.
• 3GPP recognised NavIC for mobile phones in 2020. The IMO accepted it as part of the World-Wide Radio Navigation System in 2020.

Applications

• Vehicle tracking (mandatory in public transport trackers under AIS-140).
• Alerts to fishermen at sea.
• Disaster management and mapping.
• Precise timing for power grids, telecom and banking.
• Defence and strategic use, with no dependence on foreign systems during conflicts.

Static connect

• Global systems (GNSS): GPS (USA), GLONASS (Russia), Galileo (European Union), BeiDou (China).
• Regional systems: NavIC (India), QZSS (Japan).
• GAGAN (GPS Aided GEO Augmented Navigation) is a Satellite-Based Augmentation System (SBAS) of ISRO and the Airports Authority of India. It improves GPS accuracy for civil aviation.
• GSLV uses an indigenous cryogenic upper stage (CUS).

Way forward

• Launch NVS-04 and NVS-05 quickly to complete the seven-satellite constellation.
• Build a proven record for indigenous atomic clocks.
• Push NavIC-enabled chipsets in phones and vehicles.
• Plan for expansion of coverage beyond the region.

Exam relevance: UPSC Prelims and GS-3 (Space technology); TGPSC, APPSC (Science and Technology).