Satellite-based Navigation System has emerged as a forerunner in providing the positioning, navigation and timing (PNT) services to the users across the world. India has entered into the arena of satellite navigation with its two major projects viz. GAGAN (GPS Aided Geo Augmented Navigation), & IRNSS (Indian Regional Navigation Satellite System). GAGAN is a space-based augmentation for GPS developed jointly by ISRO and Airports Authority of India (AAI) to meet the stringent Civil Aviation Requirements. IRNSS is ISRO's initiative in developing India's indigenous regional navigation system providing PNT services to users in the Indian region.

GAGAN - GPS Aided GEO Augumented Navigation

The Indian Space Research Organization (ISRO) and the Airports Authority of India (AAI) have implemented the GAGAN project as a Satellite Based Augmentation System for the Indian Airspace. The primary objective of GAGAN is to establish a certifiable satellite based augmentation system for safety-of-life applications. The functional performance and operational requirements of GAGAN shall be governed by the specifications as mentioned in the international standards. The system shall have inter-operability with other international SBAS systems like US-WAAS, European EGNOS, and Japanese MSAS etc.

IRNSS - Indian Regional Navigation Satellite System

Indian Regional Navigation Satellite System (IRNSS) project envisages establishment of a regional navigational satellite system using a combination of GEO and GSO spacecrafts and state-of-the-art ground systems. The IRNSS System provides navigation solution all time with position accuracy better than 20m during all weather conditions, anywhere within India and a region extending about 1500 km around India. IRNSS provides Standard Positioning Service (SPS) and Restricted Service (RS) to the users on dual frequencies in L5 and S band.