Indian plan for satellite-based navigation systems for civil aviation

摘要

The Airports Authority of India and the Indian Space Research Organization have signed a Memorandum of Understanding (MOU) to implement a satellite-based navigation system as part of the satellite-based communication, navigation, surveillance (CNS)/air traffic management (ATM) plan for civil aviation. For satellite-based navigation, two core constellations - Global Positioning System (GPS) of the United States and GLONASS of the Russian Federation are available. The position accuracies achievable with these core constellations are not good enough for precision approach and landing requirements of civil aviation. These constellations need to be augmented. Three types of augmentation systems are possible: Ground-Based Augmentation System (GBAS), Aircraft-Based Augmentation Systems (ABAS) and Space-Based Augmentation System (SBAS). ISRO will implement a proof of concept SBAS called GAGAN (GPS and GEO augmented navigation). This paper describes the Indian plan for satellite-based navigation system for civil aviation. A brief outline of the three segments - user segment, space segment and ground segment necessary for implementation of an SBAS system over the Indian airspace is given in this article.