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EGNOS services

 

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The services currently being provided by EGNOS are:

- EGNOS Safety of Life Service (SoL) This service is intended for applications where human life could be at a stake if the positioning system does not meet stringent integrity requirements.
- EGNOS Open Service (OS). Applications that have not the safety requirements met by the EGNOS SoL service, are considered to be Open Service applications.
- EGNOS Data Access Service (EDAS): this is the provision of EGNOS data through the internet. It is important to point out that the service provided by EGNOS is dependent on the receiver at the user side

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The main objective of the EGNOS Open Service is to improve the achievable positioning accuracy thanks to the correction of several error sources affecting the GPS signals.
This service is intended for applications that although requiring a high degree of accuracy, do not require the integrity features provided by EGNOS.
The Open Service is available from October 2009.
All the relevant information on the OS is provided in the Open Service Definition Document that can be found at http://www.essp-sas.eu/service_definition_documents

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In addition to the enhanced accuracy provided by the OS, the EGNOS Safety of Life (SoL) service provides the stringent integrity, continuity and availability required to support Civil Aviation applications up to LPV (Localizer Performance with Vertical guidance) operations.
The EGNOS SoL service will also be usable in a wide range of other application domains (e.g. Maritime, Railways, Road…) but, at this stage, a detailed performance characterisation has only been conducted against the requirements expressed by civil aviation. The SoL Service is available since March 2011

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In general, the EGNOS SoL Service is intended for most transport applications in different domains where lives could be endangered if the performance of the navigation system is degraded below specific accuracy limits without giving notice in the specified time to alert. This requires that the relevant authority of the particular transport domain determines specific requirements for the navigation service based on the needs of that domain, as well as certification procedures if necessary. In addition, the navigation operations based on the EGNOS SoL Service may require a specific authorisation, issued by the relevant authority, unless the authority, or applicable regulation, establishes that no such authorisation is required.
At present, only the aviation domain has specific service requirements, as well as certification and individual authorisation procedures developed and implemented

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    The EGNOS Data Access Service (EDAS) provided by the ESSP consists of the provision in almost real time of the same data that is broadcast by the EGNOS satellites (EGNOS Message) along with the GPS and Glonass measurements at all the stations of the EGNOS monitoring network (RIMS and NLES).
    These data are obtained from the EDAS server through an specific interface software (EDAS Client Software) that is provided to the EDAS user upon registration.
    Access is provided to EGNOS applications developers upon submitting the EDAS application form found at http://www.gsa.europa.eu/go/egnos/edas to the EGNOS Helpdesk and upon EC approval.

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