EGNOS Open Service SDD

Tuesday, October 03, 2017
Latest version (2.3) of the Service Definition Document (SDD) for the for the EGNOS Open Service
In Force

The European Geostationary Navigation Overlay Service (EGNOS) provides an augmentation service to the Global Positioning System (GPS) Standard Positioning Service (SPS). Presently, EGNOS augments GPS using the L1 (1575.42 MHz) Coarse/Acquisition (C/A) civilian signal function by providing correction data and integrity information for improving positioning, navigation and timing services over Europe.

This version of the “EGNOS OS Service Definition Document” (EGNOS OS SDD) is intended to give information on the EGNOS Open Service (EGNOS OS).

The document describes the EGNOS system architecture and Signal-In-Space (SIS) characteristics, the OS service performance achieved, and provides information on the established technical and organisational framework, at European level, for the provision of this service. It is intended to be of use for receiver manufacturers, GNSS application developers and the final users of the EGNOS OS.

The document also includes complementary high level information on GNSS concepts, the GPS Service, the EGNOS System/Services, the EGNOS Management structure and EGNOS interfaces with users, as well as the minimum performance characteristics of EGNOS OS.

This document is not intended to address EGNOS SoL service nor EDAS performance. Information about the EGNOS SoL is available in a separate document called the “EGNOS Service Definition Document – Safety of Life Service” (EGNOS SDD SoL –, whilst information regarding EDAS can be found in another separate document called the “EGNOS Data Access Service (EDAS) – Service Definition Document” (EDAS SDD –

This document will be updated in the future as required in order to reflect any changes and improvements to the EGNOS OS Service.