ISRO's NavIC constellation in distress, requiring urgent fixes before next-gen satellite launches
ISRO's NavIC constellation is in operational distress, with only three satellites capable of providing PNT services, failing to fulfill its purpose of replacing the U.S.'s GPS system over India. This degradation is faster than replenishment due to poor launch rates, budget constraints, and issues with PSLV. The first-generation satellites used faulty Swiss-made rubidium atomic clocks, and even the indigenous clocks in NVS-02 faced issues. India lacks a dedicated directorate for managing its PNT system, unlike GPS or Galileo. ISRO's plan to launch three more second-generation satellites in 2026 lacks confidence given the current challenges.
Key Points
- ISRO's NavIC constellation is in operational distress, with only three satellites currently providing Position, Navigation, and Timing (PNT) services.
- The constellation's degradation is attributed to poor launch rates, insufficient budget, and issues with the PSLV rocket.
- First-generation NavIC satellites suffered from failures of Swiss-made rubidium atomic clocks, and even indigenous clocks in NVS-02 faced problems.
- India lacks a dedicated directorate for managing its PNT system, unlike the U.S. (GPS Directorate) or Europe (EUSPA).
- ISRO's plan to launch three more second-generation satellites by 2026 is viewed with skepticism due to the existing challenges and overextension of the agency.
Exam Facts
- NavIC constellation launched 11 satellites since 2013.
- A PNT constellation requires at least four PNT-capable satellites.
- IRNSS-1F satellite's atomic clock failed on March 13, 2026.
- NVS-01 (launched May 2023) was the first to carry indigenous rubidium atomic clocks.
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