🚀 Science
ISRO's GSLV-F18 puts NVS-03 navigation satellite in orbit to strengthen NavIC
In 60 seconds: ISRO's GSLV-F18 rocket lifted off from the Second Launch Pad at Sriharikota on Friday night and placed the NVS-03 navigation satellite in its intended geosynchronous transfer orbit. It was the 20th GSLV flight. The satellite, about 2,250 kg and third in the next-generation NavIC series, carries an indigenous atomic clock and adds a new L1 signal. NavIC had been running on only three working satellites.
Why it matters
NavIC gives India location and timing data it controls itself, useful for defence, disaster response, fishing boats and transport. A new satellite helps fill gaps in the weakened system.
Explain it simply
Your phone's map needs several satellites in the sky, like a cook needs all the masalas. NavIC was short of a few; NVS-03 adds one back.
The 3-minute read
What happened
The rocket dropped NVS-03 into a transfer orbit with a perigee of 170 km and an apogee of 37,023 km. The satellite also carries procured atomic clocks alongside the home-built one.
Background
NavIC covers India and a region about 1,500 km beyond its boundary. It offers a public service and a secure service for the armed forces and authorised agencies.
How it works
The 50-metre, 420-tonne GSLV has three stages: a solid core with four liquid strap-ons, a liquid second stage, and an indigenous cryogenic upper stage burning liquid hydrogen and liquid oxygen.
What's next
The satellite must now raise itself to its final orbit and pass checks before it can serve users. NVS-04 and NVS-05 are planned to complete the five-satellite series.
What it means for you
Many Indian phones already support NavIC. A stronger constellation means more reliable location data for maps, delivery apps and emergency services.
Key numbers
- 20th: GSLV flight number
- ~2,250 kg: Mass of NVS-03
- 1,500 km: NavIC coverage beyond India's boundary
- 3: NavIC satellites working before this launch
Both sides
- ISRO: NVS-03 keeps navigation services going and brings home-built atomic clocks into the system.
- Cautious observers: One launch is not enough; the satellite must reach its slot and more replacements must follow.
Key terms explained
- NavIC
- India's own regional satellite navigation system, giving position and timing over India and nearby areas.
- Atomic clock
- An extremely precise clock based on atoms' vibrations; navigation satellites need it to measure distance by time.
The story so far
- May 2023: GSLV-F12 launches NVS-01, the first next-generation NavIC satellite. NVS-01 opened the second-generation series meant to replace ageing IRNSS satellites and keep India's regional navigation service running.
- Jan 2025: NVS-02 reaches an initial orbit but a propulsion fault stops it short. A technical fault in its propulsion system meant NVS-02 could not be raised to its intended orbit, leaving NavIC short of working satellites.
- Today: GSLV-F18 places NVS-03 in orbit to strengthen NavIC
Exam notes (UPSC, SSC, Banking, PSC)
- NavIC (Navigation with Indian Constellation) is the operational name of the Indian Regional Navigation Satellite System (IRNSS).
- Satish Dhawan Space Centre (SDSC SHAR) at Sriharikota in Andhra Pradesh is India's main spaceport.
- GSLV's third stage is a cryogenic stage that uses liquid hydrogen as fuel and liquid oxygen as oxidiser.
- Other global navigation systems include GPS (US), GLONASS (Russia), Galileo (EU) and BeiDou (China); Japan's QZSS is regional like NavIC.
Likely exam question: Why does India need its own satellite navigation system? Discuss NavIC's features and the challenges in keeping it fully operational.