Current Affairs · · GS3 · Science & Technology

GSLV-F18 launches NVS-03 to help restore NavIC positioning

ISRO launched the NVS-03 navigation satellite on GSLV-F18 from Sriharikota on 30 October 2026, placing it in a geosynchronous transfer orbit. It carries an Indian-made atomic clock and an L1 signal. Once raised to its final orbit and commissioned, it should give NavIC the fourth working satellite it needs for standalone positioning.

Event date:

REq1
  1. Note1 / 5

    WHY IN NEWS?

    • On 30 October 2026, GSLV-F18, the 20th flight of the GSLV, lifted off from the Second Launch Pad at Sriharikota.
    • It carried NVS-03, the third second-generation NavIC satellite and the 12th in the series.
    • The satellite was placed in a geosynchronous transfer orbit (GTO).
    • It carries an indigenous rubidium atomic clock alongside procured clocks.
    • It must now be raised to its final orbit and tested before entering service.
  2. Note2 / 5

    WHAT NVS-03 ADDS

    FeatureDetail
    MassAbout 2,250 kg
    Mission lifeAbout 12 years
    SignalsL1 (new), plus L5 and S bands
    ClockIndian-made rubidium atomic clock, with procured clocks
    RoleRestore the four-satellite minimum for standalone positioning

    The L1 band is used by most global systems, so it makes NavIC easier to build into everyday phones and devices.

  3. Note3 / 5

    KEY CONCEPTS

    1. What is NavIC?

    India's regional satellite navigation system, formerly IRNSS. It covers India and about 1,500 km around it.

    1. What orbits does it use?

    The design uses seven satellites: three in geostationary orbit and four in inclined geosynchronous orbit.

    1. What is a geosynchronous transfer orbit?

    A temporary, elongated orbit. The satellite then fires its own engine to climb to its final circular orbit about 36,000 km up.

    1. What services does NavIC offer?

    A Standard Positioning Service for civilians and an encrypted Restricted Service for authorised users such as the armed forces.

  4. Note4 / 5

    WHY IT MATTERS

    • Strategic autonomy: Less reliance on GPS, GLONASS, Galileo and BeiDou in a crisis.
    • Security: Secure signals for military aircraft, ships and border units.
    • Economy: Vehicle tracking, fishing safety, farming and disaster response.
    • Timing: Precise time for telecom, banking and power grids.
    • Self-reliance: An Indian clock tackles the imported-clock failures that weakened earlier satellites.
  5. Note5 / 5

    WAY FORWARD

    These are suggested measures, not approved policy.

    • Complete the constellation with NVS-04 and NVS-05.
    • Make clocks and chips at home, including radiation-hardened electronics.
    • Test more rigorously after the NVS-02 failure.
    • Drive adoption in phones, vehicles, aviation and shipping.
    • Protect signals against jamming and spoofing.
    • Offer services to neighbouring countries.

Sources

Syllabus

PaperSubjectSub-topic
GS3Science & TechnologySpace technology, indigenisation, security
PrelimsScience & TechnologyNavIC, GSLV, GTO, atomic clocks, L1/L5 bands

Topics

Defence TechnologyInformation and Communication TechnologySpace Technology

Related previous-year questions

Asked in earlier UPSC Prelims papers on this topic. Answer, then check.

  1. UPSC Prelims 2018 · Science and Technology · Space Technology

    With reference to the Indian Regional Navigation Satellite System (IRNSS), consider the following statements: 1. IRNSS has three satellites in geostationary and four satellites in geosynchronous orbits. 2. IRNSS covers entire India and about 5500 sq. km beyond its borders. 3. India will have its own satellite navigation system with full global coverage by the middle of 2019. Which of the statements given above is/are correct?

    1. 1 only
    2. 1 and 2 only
    3. 2 and 3 only
    4. None
    Show answer

    Answer: A. Only statement 1 is correct, so the answer is (a) 1 only. Statement 1 is CORRECT. The IRNSS space segment is a constellation of seven satellites, called NavIC. Three sit in geostationary orbital slots and the remaining four in geosynchronous orbits with the required inclination and equatorial crossings in two different planes. Statement 2 is INCORRECT. IRNSS is designed to serve users in India and the region extending up to 1500 km from its boundary, which is its primary service area, with an extended service area beyond that. The figure of 5500 square kilometres both misstates the distance and uses the wrong unit for it. Statement 3 is INCORRECT. IRNSS is a regional system, and India will not have a satellite navigation system with full global coverage by the middle of 2019. SOURCE: ISRO IRNSS programme page, and The Hindu report on IRNSS-1I completing the navigation fleet. HOW TO CRACK IT: Read the unit, not just the number. Statement 2 offers an area in square kilometres where coverage beyond a border must be a distance, and 5500 square kilometres would be a trivially small patch. Unit mismatch is a quiet but reliable tell. The name itself, Indian Regional Navigation Satellite System, disposes of statement 3.

    Difficulty: medium · statement

    Open this question on its own page, with the full explanation →

Practice questions

  1. NavIC's original constellation design includes how many satellites in geostationary orbit?

    1. Two
    2. Three
    3. Four
    4. Seven
    Show answer

    Answer: B. Four more are in inclined geosynchronous orbit.

    Difficulty: medium · statement

  2. Adding the L1 band to NavIC satellites mainly helps by:

    1. Increasing launch mass
    2. Improving compatibility with common consumer devices
    3. Reducing orbit height
    4. Replacing the S band
    Show answer

    Answer: B. L1 is widely used by global navigation systems.

    Difficulty: medium · statement

  3. A geosynchronous transfer orbit is:

    1. The final orbit of a navigation satellite
    2. An intermediate elongated orbit from which a satellite climbs to its final orbit
    3. A low Earth orbit
    4. A polar orbit
    Show answer

    Answer: B. The satellite uses its own engine to reach geostationary height.

    Difficulty: medium · statement

Mains practice

Answer-writing practice on this article. Attempt it first, then open the hints.

  1. GS3 · 150 words

    Why is an independent regional navigation system important for India? Discuss the challenges NavIC has faced and how NVS-series satellites address them.

    Show hints
    1. Strategic autonomy
    2. Restricted Service, clock failures
    3. four-satellite minimum, indigenous clock
    4. L1 band
    5. adoption.