The European GNSS Agency on behalf of the European Commission has released a new version for the three EGNOS Service Definition Documents (SDD) already available for the EGNOS users:

Open Service SDD (v2.1)

Safety of Life Service SDD (v2.1)
EDAS Service SDD (v2.1)

These are the current versions in force for each of the EGNOS SDDs.

The EGNOS Service Definition Document (SDD) describes the characteristics and conditions of access to the corresponding EGNOS service offered to users. Each SDD also contains updated information about the EGNOS system architecture and a Signal-In-Space (SIS) characteristic, the service performance achieved, EGNOS interfaces with users and provides information on the established technical and organizational framework, at European level, for the provision of this service.

The first version of each SDD was published by the European Commission when each of the EGNOS Service was declared operational (1st October 2009, 2nd March 2011 and 30th July 2012 respectively for Open Service, Safety-of-Life and EDAS). New SDD versions are periodically published to reflect the significant changes in the EGNOS service.

EGNOS (the European Geostationary Navigation Overlay Service) is the European Satellite-Based Augmentation System (SBAS) that complements the GPS system to improve the accuracy and provides integrity to the signal over most of Europe.

It is Europe’s first venture into satellite navigation and a major stepping-stone towards Galileo, Europe’s own global satellite navigation system for the future.


Original source: European GNSS Agency