NavIC (Navigation with Indian Constellation)

India's own satellite navigation system, formerly called IRNSS. It is designed to give positions across India and up to 1,500 km beyond its borders.

Purpose

NavIC tells a receiver where it is and what time it is, like GPS but run by India. It is designed for position accuracy better than 20 m and timing accuracy better than 50 nanoseconds.

It offers two services. The Standard Positioning Service is for everyone. The Restricted Service is encrypted, for authorised users only. Signals are sent in the L5 and S bands, and newer satellites add a civilian L1 signal.

Members

NavIC is designed with seven satellites. Three sit in geostationary orbit at 32.5°E, 83°E and 129.5°E. Four are in geosynchronous orbits tilted by 29°.

The first generation was IRNSS-1A to IRNSS-1I. The second generation is the NVS series. ISTRAC set up the ground segment.

Timeline

  • 1 July 2013: IRNSS-1A launched on PSLV-C22
  • 28 April 2016: IRNSS-1G launched, completing the first set of seven
  • 31 August 2017: IRNSS-1H lost in a PSLV launch failure
  • 12 April 2018: IRNSS-1I launched
  • 29 May 2023: NVS-01 launched on GSLV-F12
  • 29 January 2025: NVS-02 launched on GSLV-F15, the 100th launch from Sriharikota
  • 30 October 2026: NVS-03 launched on GSLV-F18

Status

Several older satellites now provide only messaging services. ISRO lists IRNSS-1B, IRNSS-1I and NVS-01 as giving navigation service. NVS-02 is listed as not operational. In October 2026 GSLV-F18 placed NVS-03 in its intended orbit.

Sources

  1. Satellite navigation services — ISRO
  2. IRNSS programme — ISRO
  3. Spacecraft missions — ISRO
  4. ISRO Telemetry, Tracking and Command Network (ISTRAC) — ISRO
  5. URSC home page — URSC