The Galileo positioning system is a proposed satellite navigation system, to be built by the European Union (EU) as an alternative to the US military-controlled Global Positioning System and the Russian GLONASS. The system should be operational by 2010, two years later than originally anticipated. The Galileo positioning system is not abbreviated to GPS; use of the acronym "GPS", here and elsewhere, refers to the existing United States system.
The Galileo System will comprise global, regional and local components. The global component is the core of the system, comprising the satellites and the required ground segment
The regional component of Galileo may comprise a number of External Region Integrity Systems (ERIS), implemented and operated by organisations, countries or groups of countries outside Europe to obtain integrity services independent of the Galileo System, in order, for example, to satisfy legal constraints relating to system guarantees. Local components may be deployed for enhancing the performance of Galileo locally. These will enable higher performance such as the delivery of navigation signal in areas where the satellite signals cannot be received. Value-added service providers will deploy local components.
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