GAGAN satellite technology.

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About GAGAN satellite technology:

GAGAN is the acronym for GPS Aided GEO Augmented Navigation.
It is jointly developed by ISRO (Indian Space Research Organisation) and the Airports Authority of India (AAI).
It uses a system of ground stations to provide necessary augmentations to the GPS standard positioning service (SPS) navigation signal.
It is designed to provide the additional accuracy, availability, and integrity necessary to enable users to rely on GPS for all phases of flight.
It also provides the capability for increased accuracy in position reporting, allowing for more uniform and high-quality Air Traffic Management (ATM).
In addition, GAGAN will provide benefits beyond aviation to all modes of transportation, including maritime, highways, and railroads.
There are only four Space-Based augmentation systems available in the world namely India (GAGAN), US (WAAS,) Europe(EGNOS) and Japan (MSAS).

The PBN concept specifies aircraft RNAV system performance requirements in terms of accuracy, integrity, availability, continuity and functionality needed for the proposed operations in the context of a particular Airspace Concept.
This concept represents a shift from sensor-based to performance-based navigation.
Performance requirements are identified in navigation specifications, which also identify the choice of navigation sensors and equipment that may be used to meet the performance requirements.

Q1) What is Global Positioning System?

Global Positioning System is a satellite-based navigation system that allows users to determine their precise location anywhere on Earth. The GPS system consists of a network of satellites orbiting the Earth, ground-based control stations, and GPS receivers or devices used by users.

Source: PM lauds Asia’s first demonstration for Performance-Based Navigation for helicopters