EGNOS provides a terrestrial data service called the EGNOS Data Access Service (EDAS), e.g. through an internet connection.
EDAS disseminates EGNOS data in real time without relying on the signals from the three EGNOS’ satellites. EDAS is the single point of access for the data collected and generated by the EGNOS infrastructure. It supports the multimodal use of EGNOS (and later on Galileo) by disseminating advanced EGNOS’ services in real time and within guaranteed performance boundaries. It is available through a ground network without requiring direct access to an EGNOS satellite. It can therefore be used in constrained environments such as when signals are blocked, not visible, or are disturbed by interference. For example, in the northern areas of the EU, the geostationary satellites hovering above the equator will not be sufficiently visible.
EDAS delivers two main types of data in real time, via ground transmission systems:
- EGNOS augmentation messages, as normally received by users via the EGNOS geostationary satellites;
- Raw GPS data collected by the EGNOS monitoring reference network.
EDAS is the third EGNOS Service, along with the Open Service and the Safety-of-Life Service.
The EDAS system
EDAS builds on the performance qualities of EGNOS to provide a reliable and high level of service to users. EDAS offers the following key advantages:
- Reliability and assurance: EGNOS will be a certified augmentation system that can be used for applications where lives could be at stake (Safety-of-Life Service). Such a service requires a highly reliable and resilient infrastructure. This infrastructure is the basis for EDAS.
- Data delivery: EGNOS data is provided in real time through a standard internet connection or direct fixed-line.
- Data content: EDAS not only provides EGNOS broadcast data, but also raw data and satellite status messages from the system’s ranging and integrity monitoring stations (RIMS).
- European and North African coverage: EDAS data is sourced from EGNOS’ 34 RIMS and generates unique global navigation satellite system (GNSS) data from Europe and North Africa.
- Commercial contracts: In the future, it is planned that EDAS can be provided to service providers on a long-term basis with reliable performance levels on a contractual basis.
For more information on EDAS and how to access the service go to the EDAS website.