GPS Aided GEO Augmented Navigation

GPS Aided GEO Augmented Navigation Latest News

Recently, under the watch of the Directorate General of Civil Aviation (DGCA) for the first time a private jet was landed by using GPS Aided GEO Augmented Navigation (GAGAN). 

About GPS Aided GEO Augmented Navigation

• It is a Satellite Based Augmentation System (SBAS) implemented jointly with Airport Authority of India (AAI) and ISRO.
• The main objectives of GAGAN are
  • To provide Satellite-based Navigation services with accuracy and integrity required for civil aviation applications.
  • To provide better Air Traffic Management over Indian Airspace.
• It is interoperable with other international SBAS systems and provides seamless navigation across regional boundaries.
• GAGAN operates through a combination of ground-based and space-based segments to enhance the accuracy and reliability of the GPS signals.

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Functioning of GAGAN

• Ground/Control Segment
  • Reference Stations (INRES): A network of 15 precisely surveyed ground reference stations (INdian Reference Stations) is strategically placed across India. These stations collect GPS satellite data.
  • Through this, errors caused by ionospheric disturbances, satellite orbit errors and inaccurate clocks are corrected.
  • Master Control Centre (INMCC): The collected data is sent to the Indian Master Control Centre, where correction messages are generated to rectify any signal errors.
  • Land Uplink Station (INLUS): The correction messages are then uplinked through the Indian Land Uplink Station.
  • Through this, the corrected messages are sent to the geostationary satellites which then broadcast them to the aircraft.
• Space Segment
  • This segment includes the communication satellites which were flown as GSAT-8 in 2011, GSAT-10 in 2012 and GSAT-15 in 2015.
  • These geostationary communication satellites carry the GAGAN payloads.
  • The correction messages are broadcast through these satellites to GPS receivers on aircraft.

 Source: IT