GAGAN powers India's first commercial jet satellite landing via IndiGo A320
Synopsis
India's homegrown GAGAN system just guided a full-sized commercial jet to a precise landing — no ground radio towers needed. The IndiGo A320 demonstration on 27 June is the first of its kind in India, and with AAI targeting 40+ LPV-enabled airports by year-end, it signals a structural shift in how the country's rapidly expanding aviation network handles precision landings.
Key Takeaways
An IndiGo Airbus A320 completed India's first satellite-guided commercial jet landing on 27 June 2025 , supervised by the DGCA .
The aircraft used a Localiser Performance with Vertical Guidance (LPV) approach powered by India's GAGAN system — no ground-based ILS infrastructure required.
GAGAN is jointly developed by ISRO and AAI , using a network of 15 ground reference stations and corrections broadcast via GSAT-8 and GSAT-10 satellites.
IndiGo first introduced LPV operations on its ATR turboprop fleet in 2022 ; the A320 demo is the first on a commercial jetliner.
AAI has published 23 LPV approach procedures at Indian airports, with plans to exceed 40 by end of 2025 .
The system benefits airports without ILS and can serve as a backup during ILS maintenance or flight diversions.
An IndiGo Airbus A320 on 27 June 2025 completed India's first satellite-guided commercial jet landing using the indigenously developed GAGAN navigation system, in a demonstration flight conducted under the supervision of the Directorate General of Civil Aviation (DGCA). The milestone marks a significant leap for Indian aviation, establishing that a full-sized commercial jetliner can land with precision using homegrown satellite-based technology — without any ground-based radio infrastructure.
What Made This Landing Different
Unlike the conventional Instrument Landing System (ILS) — which relies on specialised radio transmitters physically installed at each airport — the IndiGo A320 executed a Localiser Performance with Vertical Guidance (LPV) approach, guided entirely by satellite signals. The LPV procedure provides pilots with both horizontal and vertical guidance during final approach, delivering precision comparable to ILS, according to Airbus.
Passengers aboard the demonstration flight would have noticed nothing unusual. The aircraft was steered by satellite-based navigation rather than airport-based transmitters, making the transition operationally seamless. IndiGo had previously tested the technology on its ATR turboprop fleet — first introducing LPV operations on those aircraft in 2022 — but this was the first successful demonstration on a commercial jetliner.
How GAGAN Works
GAGAN, or GPS-Aided GEO-Augmented Navigation, is India's Satellite-Based Augmentation System (SBAS), jointly developed by the Indian Space Research Organisation (ISRO) and the Airports Authority of India (AAI). It does not function as an independent navigation system like GPS or India's NavIC; instead, it enhances existing GPS signals by correcting errors and continuously monitoring their reliability for aviation use.
The system relies on a network of 15 accurately surveyed ground reference stations spread across the country. These stations compare their fixed, known positions against live GPS readings to detect even minor discrepancies. Corrections are processed at dedicated control centres and relayed in real time to aircraft via ISRO's GSAT-8 and GSAT-10 geostationary satellites, which provide uninterrupted coverage across Indian airspace.
A critical feature is GAGAN's integrity monitoring capability: the system continuously checks the reliability of navigation signals and can alert pilots within seconds if any anomaly is detected, enabling immediate corrective action. This is what separates it from standard GPS — accurate enough for smartphones, but insufficient for the precision and reliability that commercial landings demand.
Why India Needed This Technology
India's geography presents a particular challenge for GPS-based aviation. The country lies beneath the equatorial ionisation anomaly, a region where atmospheric disturbances can cause significant and unpredictable distortions in GPS signals. Standard GPS cannot guarantee the integrity required for aircraft approaches in such conditions.
GAGAN addresses this directly. Beyond precision, the system also benefits airports that currently lack ILS infrastructure — a significant portion of India's expanding airport network. It can additionally serve as a backup when ILS is unavailable due to maintenance, or when flights are diverted to alternate airports without ILS capability, according to experts.
Scale of Deployment and What Comes Next
The AAI has already published 23 LPV approach procedures at airports across India, with plans to expand that figure to more than 40 by the end of the year. IndiGo has progressively expanded SBAS-enabled capabilities across more aircraft since its initial ATR trials in 2022.
ISRO states that GAGAN is also designed to improve air traffic management by enabling more direct, fuel-efficient flight paths. The system is compatible with similar satellite-based augmentation networks used internationally, ensuring navigation continuity for aircraft operating across borders.
Experts say the successful A320 demonstration is expected to accelerate adoption of satellite-based precision approaches across India's growing aviation infrastructure — making air travel safer, more efficient, and accessible at airports where ground-based landing systems remain out of reach.
Point of View
But ILS installations remain concentrated at major hubs; the rest operate with limited precision approach capability. GAGAN's LPV approach changes the calculus for tier-2 and tier-3 airports, where the absence of ground-based landing systems has long constrained operations in low-visibility conditions. The real measure of this milestone will not be the demonstration flight but the pace at which AAI converts its target of 40-plus LPV procedures into operational reality — and whether airlines move to certify their wider fleets accordingly. ISRO's role here is also worth noting: GAGAN represents one of the few cases where a space agency deliverable has direct, daily commercial aviation utility, a model that deserves replication.
NationPress
29 Jun 2026
Frequently Asked Questions
What is GAGAN and how does it work?
GAGAN, or GPS-Aided GEO-Augmented Navigation, is India's Satellite-Based Augmentation System jointly developed by ISRO and AAI. It improves the accuracy and reliability of GPS signals for aviation by using 15 ground reference stations to detect errors, then broadcasting corrections in real time through the GSAT-8 and GSAT-10 geostationary satellites to aircraft in Indian airspace.
What happened on 27 June 2025 with the IndiGo A320?
An IndiGo Airbus A320 completed India's first satellite-guided commercial jet landing using the GAGAN navigation system on 27 June 2025, under DGCA supervision. The aircraft used an LPV approach — providing both horizontal and vertical landing guidance — without relying on any ground-based Instrument Landing System.
How is GAGAN different from ILS and NavIC?
ILS uses ground-based radio transmitters at airports to guide aircraft during landing, requiring costly infrastructure at each site. NavIC is an independent satellite navigation system that determines location on its own. GAGAN does neither — it augments existing GPS by correcting signal errors and monitoring reliability, making GPS precise and trustworthy enough for aviation approaches.
Which airports in India currently support GAGAN-based LPV approaches?
The Airports Authority of India has published 23 LPV approach procedures at airports across India as of the time of the demonstration. AAI plans to increase that number to more than 40 by the end of 2025, prioritising airports that currently lack ILS infrastructure.
Why does India need satellite-based landing systems?
India lies beneath the equatorial ionisation anomaly, where atmospheric disturbances can significantly distort GPS signals — making standard GPS unreliable for precision landings. Additionally, a large number of Indian airports lack ILS installations. GAGAN addresses both problems: it corrects ionospheric errors and enables precision approaches at airports without ground-based landing infrastructure.
