The International GNSS Service
The International global navigation satellite system (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-f
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Gary Johnston, Anna Riddell, Grant Hausler
The International global navigation satellite system (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 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.
33.1 Mission and Organization . ................. 33.1.1 Mission............................................. 33.1.2 Structure...........................................
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33.2 33.2.1
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33.2.2 33.2.3 33.2.4 33.2.5 33.2.6
Components ..................................... IGS Governing Board and Executive Committee ................... IGS Central Bureau ............................. IGS Network ...................................... Analysis Centers................................. Data Centers (DCs) .............................. Working Groups.................................
33.3 33.3.1 33.3.2 33.3.3 33.3.4
IGS Products ..................................... Orbits and Clocks ............................... Earth Orientation and Site Coordinates Atmospheric Parameters..................... Biases...............................................
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33.4 Pilot Projects and Experiments .......... 33.4.1 Real-Time ......................................... 33.4.2 Multi-GNSS .......................................
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33.5
Outlook ............................................
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References...................................................
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33.1 Mission and Organization 33.1.1 Mission The stated mission of the IGS is as follows [33.1]: The International GNSS Service provides, on an openly available basis, the highest-quality GNSS data, products, and services in support of the terrestrial reference frame; Earth observation and research; Positioning, Navigation and Timing (PNT); and other applications that benefit the scientific community and society. The IGS promotes a culture of shared expertise to encourage global best practice for developing and delivering GNSS data and products worldwide. This collaborative approach encourages input from a diverse
user community to strengthen uptake and promote innovation. The IGS has a strong interface with providers of GNSS equipment and services, and the owners of GNSS themselves. Drawing on a global research community, the IGS ensures that new technologies and syste
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