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EGNOS Data Access Service SDD

Friday, December 19, 2014
Latest version (2.1) of the Service Definition Document (SDD) for the EGNOS Data Access Service (EDAS).
In Force

The European Geostationary Navigation Overlay Service (EGNOS) provides an augmentation signal 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 and navigation services over Europe.

EGNOS provides three services:

  • Open Service (OS), freely available to any user;
  • Safety of Life (SoL) Service, that provides the most stringent level of signal-in-space performance to all Safety of Life user communities;
  • EGNOS Data Access Service (EDAS) for users who require enhanced performance through Internet connection for commercial and professional use.

The EGNOS Data Access Service (EDAS) aims at providing ground-based access to EGNOS data. EDAS services are accessible through the Internet with the condition to be a registered user.

This version of the “EDAS Service Definition Document” (referred as EDAS SDD) is intended to provide information on the EDAS services, which are oriented to users in different domains of application such as Location Based Services (LBS), a broad range of services in professional GNSS markets, Assisted-GNSS (A-GNSS) concepts, and related R&D activities.

The document describes the EDAS system architecture and provides an overview of the current EDAS services with regards to the information that is transmitted and data formats. The brief description of each EDAS Service is presented, along with the minimum EDAS services performance. The EDAS SDD does not intend to give an exhaustive description of the message structure and data formats; it is not intended to be an Interface Control Document (ICD).

The document also includes high level information on EGNOS interfaces with users, as well as guidelines to register as EDAS user or to check the monthly EDAS services performance (publicly available).The observed performance of the EDAS services over a specified period is also given in appendix B.

This document is not intended to address EGNOS Open Service (OS) or EGNOS Safety of Life (SoL) performance. Information about the EGNOS OS and the EGNOS SoL is available in separate documents called the “EGNOS Service Definition Document – Open Service” (EGNOS SDD OS – and the “EGNOS Service Definition Document – Safety of Life Service” (EGNOS SDD SoL - respectively.

This document will be updated in the future as required in order to reflect any changes to the EDAS services.