India Conducts First Jet Aircraft Landing Using GAGAN Satellite Navigation System

India marked a historic milestone in civil aviation on 27 June 2026 when the Directorate General of Civil Aviation (DGCA) carried out the country's first-ever satellite-based landing approach on a jet aircraft. An IndiGo A320 successfully landed at Udaipur Airport using the GAGAN navigation system, a first for jet operations. Previously, this technology had only been tested on smaller turboprop aircraft.

What is the GAGAN System?

GAGAN stands for GPS Aided GEO Augmented Navigation. It is India's own satellite-based augmentation system (SBAS) for civil aviation, developed jointly by the Indian Space Research Organisation (ISRO) and the Airports Authority of India (AAI). The system improves the accuracy of standard GPS signals using geostationary satellites and a network of ground reference stations spread across India. India is the first country in the Asia-Pacific region to have an operational SBAS system, placing it among a select group of nations with this capability.

Key Features of Gagan Satellite

Some of the key features of Gagan Satellite are GPS accuracy, precision landing, interoperability, and global standing. 

1. Provides GPS accuracy to within 1.5 meters horizontally and 2.5 meters vertically.
2. Provides pilots with vertical and lateral guidance during landing. 
3. India is the fourth country, after the USA, Europe, and Japan, to offer this SBAS service. 
4. GAGAN is fully interoperable with other international systems. 

How GAGAN Satellite Works

GAGAN satellite relies on a complex network of ground and space segments.

1. GPS signal received — The aircraft receives standard GPS signals from satellites, which have some margin of error.
2. Ground stations check accuracy -  A network of reference stations across India constantly monitors GPS signals and detects errors.
3. Correction signals are sent -  Error correction data is sent up to geostationary satellites positioned over India.
4. Aircraft receives corrected data - The GAGAN-equipped aircraft receives the improved signal, achieving about 3 meters of navigation accuracy.
5. LPV approach executed - Using Localiser Performance with Vertical Guidance (LPV), pilots get both horizontal and vertical guidance, even at airports without a traditional Instrument Landing System (ILS).

Applications of GAGAN

Beyond aviation, GAGAN's precise positioning capability is useful across several sectors. As of May 2026, AAI had published 23 LPV approach procedures, targeting over 40 by the end of 2026.

1. Civil Aviation
2. Railways
3. Maritime
4. Transportation
5. Surveying
6. Security
7. Air Traffic Management

Important facts about GAGAN Satellite

1. GAGAN = GPS Aided GEO Augmented Navigation India's SBAS for aviation
2. Developed jointly by ISRO and the Airports Authority of India (AAI)
3. India is the first country in the Asia-Pacific with an operational SBAS
4. First jet aircraft (IndiGo A320) GAGAN landing: 27 June 2026, Udaipur Airport
5. GAGAN equipment is mandatory for all aircraft registered in India after 1 July 2021
6. LPV = Localiser Performance with Vertical Guidance