The International GNSS Service

Abstract

The International global navigation satellite system (GNSSglobal navigation satellite system (GNSS) ) Service (IGSInternational GNSS Service (IGS)) is an organization devoted to the generation of high-precision GNSS data and products; a service that benefits science and society. It is a voluntary federation of over 200 self-funding agencies, universities, and research institutions in more than 100 countries. Established in 1992 and formally launched on 1st January 1994, the IGS has delivered an uninterrupted time series of products that are utilized by a broad spectrum of users. IGS products have evolved over time, including the provision of GNSS data for constellations other than GPSGlobal Positioning System (GPS), and the addition of real-time GNSS data and products. This chapter provides an overview of the IGS, including a brief history and details of the current organization and its key components. The various products offered by the IGS are described and an outlook of future activities is given.