India’s SBAS-GAGAN passes final test

The Airports Authority of India (AAI) has successfully conducted the Final Acceptance Test of India’s Satellite Based Augmentation System-GAGAN, paving the way for the scheduled commissioning of the system in mid-2013.
GAGAN (GPS Aided Geo Augmented Navigation) is a project jointly undertaken by Airports Authority of India and ISRO in accordance with ICAO’s strategic plan to achieve the smooth transition to satellite based navigation and seamless air traffic management across continents.
GAGAN Final System Acceptance Test (FSAT) was successfully completed on 17 July. The objective of Final System Acceptance Test was to evaluate the system performance and its critical parameters in the integrated live environment using the satellite signals and ground based systems on integrity, accuracy, continuity and availability for aviation use. AAI said the FSAT results have successfully demonstrated that GAGAN signals meet the ICAO SARPS requirements.
The current GAGAN configuration includes 15 Indian Reference Stations (INRES), two Indian Master Control centres (INMCC), three Indian Land Uplink Stations (INLUS), two GEO satellites (GSAT-8 & GSAT-10). All the INRES are integrated with redundant communication links (which include two OFC and two VSAT links) to transfer data to the INMCC.
India is only the fourth country in the world, after USA, JAPAN and Europe to establish a regional SBAS that will help redefine navigation. The footprint of GAGAN will cover a huge area beyond India, from Africa to Australia and can support seamless navigation across the globe.
Further, GAGAN is the first system in the world that is being developed to serve the equatorial anomaly region with its unique IONO algorithm designed and developed by scientists and experts from ISRO and AAI in collaboration with Raytheon. The certification process of the system is underway.
As the footprint of the GAGAN space segment covers a large portion of the Asia-Pacific region i.e., the whole of Indian region and neighbouring countries such as Sri Lanka, Pakistan, Afghanistan, Bhutan, Nepal and Bangladesh, all these states will derive benefit of the system to provide SBAS services by appropriately augmenting ground segments.
GAGAN is designed to provide the additional accuracy, availability, and integrity necessary to enable users to rely on GPS for all phases of flight, from en route through approach for all qualified airports within the GAGAN service volume. GAGAN will also provide the capability for increased accuracy in position reporting, allowing for more uniform and high-quality  air traffic management.
In addition, GAGAN will provide benefits beyond aviation to all modes of transportation, including maritime, highways, railroads and public services such as defence services, security agencies, telecom industry and personal users of position location applications.