Satellite Navigation (SATNAV) has revolutionized the navigation
world, opening new opportunities which require high precision
positioning and timing. Large service volume and all weather
capability provide varieties of applications. Under satellite
navigation, SAC is working on IRNSS - Indian Regional Navigation
Satellite System and the GAGAN systems. IRNSS aims at providing
Standard Position Services (SPS) and Restricted Services (RS) for
Indian Regional Navigation satellite System (IRNSS) is an
independent regional navigation satellite system developed by
India. It is designed to provide accurate position information
service to users in India as well as the region extending up to
1500 km from its boundary, which is its primary service area.
The constellation of 7 satellite is operational from April
2016. IRNSS will provide a position accuracy of better than 20 m.
IRNSS User receivers being developed by SAC will provide
timing and position information using signals broadcast by IRNSS
Satellites and will form the basis for variety of IRNSS
applications including civil aviation applications.
IRNSS system is now called ‘NAVIC’ an acronym of NAVigation
using Indian Constellation.
Some applications of IRNSS/NAVIC are:
- Terrestrial, Aerial and Marine Navigation
- Disaster Management
- Vehicle tracking and fleet management
- Integration with mobile phones
- Precise Timing
- Mapping and Geodetic data capture
- Terrestrial navigation aid for hikers and travellers
- Visual and voice navigation for drivers
GPS Aided Geo Augmented Navigation (GAGAN) is a Satellite
Based Augmentation System (SBAS) implemented jointly with Airport
Authority of India (AAI). The main objectives of GAGAN are to
provide Satellite-based Navigation services with accuracy and
integrity required for civil aviation applications and to provide
better Air Traffic Management over Indian Airspace. The system
will be interoperable with other international SBAS systems and
provide seamless navigation across regional boundaries. The first
GAGAN navigation payload was flown on GSAT-8 which was launched on
May 21, 2011 and the second on GSAT-10 launched on Sep 29, 2012.
With GAGAN systems Satellite Navigation based civil
aviation has got tremendous boost. The implementation of GAGAN has
resulted into numerous benefits to the aviation sector in terms of
fuel saving, saving in equipment cost, flight safety, increased
air space capacity, efficiency, enhancement of reliability,
reduction in work load for operators, coverage of oceanic area for
air traffic control, high position accuracy, etc.
In addition to aviation sector, GAGAN is expected to bring
benefits to other sectors like:
- Navigation and Safety Enhancement in Railways, Roadways,
- Geographic Data Collection
- Scientific Research for Atmospheric Studies
- Natural Resource and Land Management
- Location based services, Mobile, Tourism, etc.