Gov’t approves satellite based nav system

The Indian government has approved a proposal by the Airports Authority of India (AAI) and the Indian Space Research Organisation (ISRO) for the implementation of the GPS Aided Geo Augmented Navigation (GAGAN) project for seamless navigation over Indian airspace. With this, India will be only the fourth country in the world to have a satellite […]


Airports Authority of India (AAI) GPS Aided Geo Augmented Navigation Indian Space Research Organisation


The Indian government has approved a proposal by the Airports Authority of India (AAI) and the Indian Space Research Organisation (ISRO) for the implementation of the GPS Aided Geo Augmented Navigation (GAGAN) project for seamless navigation over Indian airspace. With this, India will be only the fourth country in the world to have a satellite based navigation system.

The AAI currently uses ground based terrestrial navigation system for providing safe navigation over the Indian airspace. This system however, has site limitations and range problems.

To overcome the limitations of ground based navigation systems, the ICAO in 1993, endorsed a Global Satellite Navigation System as a future Air Navigation System for Aviation. Following this, the AAI and ISRO entered into an MoU in 2001 for the implementation of the GAGAN project for seamless navigation over Indian airspace.

The current GPS system, maintained by the US, has 29 satellites in the 20000 kms orbit. The position accuracies required for precision approach and landing for civil aviation cannot be met by core GPS constellation. The constellation needs to be augmented to provide higher accuracy, reliability and integrity. The GPS data can be augmented with the help of Space Based Augmentation System (SBAS).