The Airports Authority of India (AAI)
and Indian Space Research Organisation (ISRO) have officially implemented
the GPS Aided Geo Augmented Navigation (GAGAN) navigation system for Indian
airspace - but airlines must still be convinced to adopt it.
Two satellites (GSAT-8 and GSAT-10) in geostationary earth
orbit are broadcasting signals for the Indian Flight Information Region
(FIR). A second backup satellite called GSAT-15 will be launched in early
2016, IHS Jane's understands.
The system is interoperable with other satellite-based augmentation
systems (SBASs) to deliver precise positional data for airspace users: the
Wide Area Augmentation System (WAAS) in the United
States; the European Geostationary Navigation Overlay Service
(EGNOS); and the MTSAT Satellite Augmentation System (MSAS) in Japan.
Compared with these systems, GAGAN employs "unique
algorithms" to deal with adverse ionospheric effects, said V Somasundaram,
a member of AAI's Air Navigation Services. The ionosphere algorithm is
known as ISRO GIVE Model-Multi-Layer Data Fusion (IGM-MLDF).
GAGAN was certified by the Indian regulator, the Directorate
General of Civil Aviation (DGCA), for en route operations with Required
Navigation Performance (RNP 0.1) in late 2013. Certification of precision
approach services (APV 1.0) followed in April 2015.
"With the implementation of GAGAN, 65 operational
airports and 450 airstrips can be revived," said Somasundaram,
"and helicopter operators can [also] derive benefits with fuel and
1568809GAGAN is certified to achieve a performance level of
APV 1.0 over the Indian landmass and RNP 0.1 over the oceanic region
within the Indian Flight Information Region (FIR). (AAI)
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