Context:
The failure of the last working atomic clock on IRNSS-1F (March 2026) has weakened India’s NavIC navigation system, raising concerns about reliability.
Key Highlights:
- System Status
- IRNSS-1F completed its 10-year mission life.
- Only 3 satellites currently functional.
- Earlier:
- 5 satellites already defunct.
- Technical Issues
- Failure of atomic clocks (critical for timing accuracy).
- Initial clocks were imported (SpectraTime, Switzerland).
- Replacement Efforts
- NVS-01 (2023): Equipped with indigenous rubidium clock.
- NVS-02 (2025): Failed to reach intended orbit.
- ISRO plans 3 replacement satellites by end-2026.
- Strategic Importance
- Provides navigation for India and 1,500 km beyond.
- Acts as backup to GPS, especially during conflicts.
Relevant Prelims Points:
- NavIC: India’s regional navigation system (ISRO).
- IRNSS: Indian Regional Navigation Satellite System.
- Atomic Clock: Provides precise timing for positioning.
- Rubidium Clock: Indigenous atomic clock variant.
- Coverage: India + 1500 km surrounding region.
Relevant Mains Points:
- Importance of space-based navigation for national security.
- Challenges in indigenous technology development.
- Need for redundancy and resilience in satellite systems.
- Role in sectors like transport, defense, disaster management.
- Way Forward
- Accelerate indigenous satellite and clock development.
- Ensure redundancy in critical space infrastructure.
- Promote NavIC adoption in commercial applications.
UPSC Relevance:
- GS III: Science & Technology, Space
- GS II: Governance, Strategic Security