Monday, August 9, 2010

GAGAN - a Satellite Based Navigation System (SBNS) to be launched tomorrow

The Union Minister for Civil Aviation, Shri Praful Patel will launch the GAGAN – a Satellite Based Augmentation System Services over India and neighbouring regions. GAGAN stands for GPS Aided Geo Augmented Navigation. This system will provide enhanced navigation performance for critical applications like Civil Aviation, Marine Navigation, Train & Road Transport, Precision Farming, Search and Rescue (SAR) operations, Surveying and Mapping (Geodetic & Geodynamic), Mining etc.

With the service being launched, India will be the 4th Country in the World to have Satellite Based Navigation System. GAGAN will be compatible with other SBAS systems such as the Wide Area Augmentation System in the US, the European Geo-stationary Navigation Overlay Service (EGNOS) and the Multi-Functional Satellite Augmentation System in Japan.

The project is based on a signal broadcast from a geo-stationary satellite, GSAT-4. The system involves the measurement of positioning errors from GPS satellites at 18 ground stations on the subcontinent. This data is fed into a central processing centre, which generates a model of the state of the ionosphere based on these results. Corrections can then be generated for random points anywhere in the country.