India launches satellite-based air navigation services

New Delhi: India on Monday launched its satellite-based air navigation services, thereby joining a select league comprising the US, Europe Union (EU) and Japan which have similar systems.

Civil Aviation Minister Ashok Gajapati Raju dedicated the services to the nation in a ceremony here.

The system -- known as Gagan or global positioning system (GPS) aided geo-augmented navigation system -- is intended to provide accurate navigation services over the Bay of Bengal, southeast Asia, Indian Ocean, Middle East and African regions.

Gagan works by augmenting and relaying data from GPS satellites with the help of two augmentation satellites and 15 earth-based reference stations.

The process corrects any anomalies in the position data and gives accurate routes, landing guidance and time saving information to the pilots.

Gagan also fills a vital gap between EU's "European Geostationary Navigation Overlay Service" (EGNOS) and Japan's "Multi-functional Satellite Augmentation System" (MSAS) coverage areas.

"It took 15 years to achieve this feat. When Indians work as a team they deliver. Now the need is to spread the word about the potential uses of this system," Raju said.

"We will reach out to the end users, other government departments and even the neighbouring countries which can use this system."

A.S. Ganeshan, project director, Gagan, ISRO Satellite Centre said: "At any given time there are 10-11 GPS satellites over India. The GPS co-ordinates are useful but not always accurate."

"The augmentation satellites with Gagan payload and the earth reference stations gives us a clear and more accurate data for navigation and other purposes," Ganeshan elaborated to IANS.

The system utilises the satellite-based wide area augmentation system (SBAS) technology which has been developed by Raytheon.

Gagan has been jointly developed by the Indian Space Research Organisation (ISRO) and Airports Authority of India (AAI). The system has been completed in 15 years at a total cost of Rs.774 crore.

It is intended to serve as a low-cost substitute for instrument landing system (ILS) and provide very accurate route guidance for the aircraft to save time and fuel.

Fuel cost is a major consideration in the Indian aviation scenario as 45-50 percent of total cost is dependent on it.

Fuel in India is nearly 50-55 percent costlier than in other neighbouring countries like Singapore or Dubai due to the addition of state levies ranging from 3-35 percent.