NavIC Satellite System And India’s Indigenous Navigation Technology

Source: Indian Express
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Why in the News?

ISRO is preparing to launch NVS-03 to strengthen NavIC, India’s regional navigation system, following failures of onboard atomic clocks and other technical issues.

News in Brief

• NavIC is India’s independent regional satellite navigation system, providing positioning and timing services across India and approximately 1,500 km beyond its boundaries.
• It is designed to offer position accuracy of up to 10 metres for civilian users, with restricted services for authorised users.
• Several satellites have experienced failures, particularly involving imported atomic clocks. Replacement missions IRNSS-1H and NVS-02 also faced technical problems.
• ISRO has introduced indigenous atomic clocks, improved satellite signals and longer mission life in newer-generation satellites to enhance reliability and device compatibility.

What is NavIC ?

• Navigation with Indian Constellation (NavIC), formerly known as the Indian Regional Navigation Satellite System (IRNSS),  is India’s indigenous satellite-based navigation system developed by ISRO.
• It provides positioning, navigation and timing (PNT) services independently of foreign navigation systems.

Key Features of NavIC

• Provides navigation services over India and approximately 1,500 km beyond its geographical boundaries.
• The system was originally designed with seven satellites to provide continuous regional coverage.
• Designed to provide location accuracy of up to 10 metres for civilian users.
• Dual Services: Standard Positioning Service (SPS)- Available to civilian users, Restricted Service (RS): An encrypted service available to authorized users, including strategic and defence agencies.
• Reduces India’s dependence on foreign navigation systems for critical applications.
• Supports transportation, disaster management, fisheries, maritime navigation, military operations and location-based services.

Global Navigation Satellite Systems

• Satellite navigation systems provide positioning and timing information through signals transmitted by satellites.
• The major global navigation systems include;

• NavIC is designed primarily for regional coverage, unlike the major global navigation systems.

Why did the NavIC system face problems?

Despite significant progress, NavIC has experienced technical difficulties that affected the functioning of its satellite constellation.

• Failure of Atomic Clocks
  • Navigation satellites depend on highly precise atomic clocks to calculate the time taken by signals to travel between satellites and receivers.
  • These time measurements help determine the exact position of a receiver on Earth.
  • Several NavIC satellites experienced failures of their imported atomic clocks, affecting their ability to provide reliable positioning data.
• Failure of replacement satellites- Two replacement satellite missions also faced technical problems.
  • IRNSS-1H (2017): The satellite could not reach orbit because the protective heat shield of the PSLV failed to separate properly, preventing the satellite from being deployed.
  • NVS-02 (2025): The satellite successfully reached its intended transfer orbit, but a propulsion-system malfunction prevented it from completing the required orbital manoeuvre.
• Shorter Operational Life
  • Several satellites experienced failures before completing their expected operational lifespan.
  • This affected the availability and continuity of navigation services.
  • The original constellation was designed with seven satellites, making the loss of operational satellites particularly significant.

What changes have been introduced in newer satellites?

ISRO has introduced several technological improvements to strengthen the reliability of NavIC.

• Indigenous Atomic Clocks
  • Newer-generation navigation satellites, including NVS-01, carry indigenously developed atomic clocks.
  • This reduces dependence on imported timing components.
  • Indigenous technology also strengthens India’s capabilities in critical space systems.
• Improved Satellite Signals
  • Newer NavIC satellites transmit signals across three frequency bands;
    • L1 band: Improves compatibility with existing navigation receivers, including smartphones and other consumer devices.
    • L5 band: Supports accurate positioning and navigation services.
    • S band: Provides an additional frequency for navigation applications.
  • The introduction of the L1 signal is particularly important because it can improve the integration of NavIC servics into widely used consumer devices.
• Longer Mission Life
  • New-generation satellites are designed with an operational lifespan of approximately 12 years.
  • This is expected to improve the continuity and reliability of navigation services.
• Improved propulsion reliability
  • ISRO has conducted additional checks to prevent a recurrence of the propulsion-system failure experienced by NVS-02.
  • These improvements are expected to strengthen the operational reliability of future navigation satellites.

Significance of NavIC for India

• NavIC strengthens India’s strategic autonomy by reducing dependence on foreign navigation systems and supports national security through military navigation, surveillance and border management.
• It aids disaster management, search-and-rescue operations, transportation, logistics and maritime navigation.
• It also benefits fishermen through information on fishing zones and potential hazards.
• Further, it supports precision agriculture, infrastructure planning and location-based services while promoting technological self-reliance through indigenous development of satellite components, atomic clocks and navigation technologies.

Challenges associated with NavIC

• NavIC faces several technological and operational challenges.
• Earlier dependence on imported atomic clocks exposed vulnerabilities in critical satellite components, while repeated satellite failures affected the continuity and reliability of navigation services.
• Its regional coverage is also limited compared to global navigation systems such as GPS, Galileo and BeiDou.
• Wider adoption remains a challenge due to limited compatibility with smartphones, vehicles and navigation receivers.
• Further, maintaining the satellite constellation requires regular launches, technological upgrades and substantial investment.

Way Forward and Conclusion

India should strengthen indigenous technologies, improve satellite reliability, ensure timely replacements and expand NavIC compatibility with smartphones and other devices. Greater investment in R&D and wider applications in agriculture, transport, fisheries and defence are also essential.

NavIC is vital for India’s strategic autonomy and technological self-reliance. Addressing technical failures and ensuring continuous satellite operations will strengthen its long-term reliability.

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