GAGAN stands for GPS Aided GEO Augmented Navigation — India’s indigenous Satellite-Based Augmentation System (SBAS) developed jointly by ISRO and the Airports Authority of India (AAI). Operational since 2015, it supports satellite navigation for aircraft operations in Indian airspace.
🛰️ What is a Satellite-Based Augmentation System?
An SBAS is a regional navigation system that improves the accuracy, reliability and integrity of GPS signals. It uses ground reference stations, master control centres, uplink stations and geostationary satellites to correct navigation errors and provide precision approach services.
📡 GAGAN Network & Space Segment
GAGAN operates through a network of ground stations and geostationary satellites that together deliver corrected navigation signals over India.
- 15 Indian Reference Stations.
- 2 Master Control Centres.
- 3 Land Uplink Stations and 4 communication networks.
- 3 geostationary satellites — payloads on GSAT-8, GSAT-10 and GSAT-15.
✈️ Aviation Applications & LPV Procedures
In June 2026, the DGCA conducted India’s first satellite-based landing approach on a commercial jet — an IndiGo A320 at Udaipur Airport — using GAGAN. As of May 2026, the AAI had published 23 Localizer Performance with Vertical Guidance (LPV) approach procedures, targeting more than 40 by the end of 2026.
🔗 Integration with NavIC
As of June 2026, efforts were underway to integrate GAGAN with NavIC (Navigation with Indian Constellation) — India’s regional satellite navigation system — to build a more sovereign positioning architecture.
📌 Key Points (Important Facts for Exams)
• GAGAN = GPS Aided GEO Augmented Navigation, operational since 2015.
• Developed jointly by ISRO and the Airports Authority of India (AAI).
• Uses payloads on GSAT-8, GSAT-10 and GSAT-15 satellites.
• India was the first country to have an SBAS certified for the equatorial region.
• LPV = Localizer Performance with Vertical Guidance; NavIC = Navigation with Indian Constellation.
🎯 Conclusion
GAGAN strengthens India’s aviation safety and precision navigation while extending to maritime, railways, road transport, disaster management, defence and geospatial mapping — and its integration with NavIC will further boost India’s self-reliant positioning capability.
📝 Practice MCQs
Q1. GAGAN stands for:
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Q2. GAGAN was jointly developed by ISRO and:
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Q3. Since which year has GAGAN been operational?
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Q4. Which satellites carry GAGAN payloads?
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Q5. India’s first satellite-based commercial jet landing approach (June 2026) was at which airport?
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Q6. LPV in aviation navigation stands for:
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Q7. An SBAS primarily improves which system’s signals?
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Q8. How many Indian Reference Stations does GAGAN use?
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Q9. NavIC stands for:
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Q10. India is notable for being the first country to have an SBAS certified for the:
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