EDAS (EGNOS Data Access Service) is the EGNOS Data Access Service providing access over the Internet to EGNOS data and corrections. In particular, the EDAS Ntrip Service provides access to the GNSS measurements (RTCM 2.1, 2.3 and 3.1 formats) coming from the EGNOS stations through the Ntrip protocol in real-time, including phase measurements for RTK (Real-time kinematic) positioning (RTCM 3.1) and differential GNSS corrections (RTCM 2.1, 2.3).
The differential GNSS corrections delivered through the EDAS Ntrip service support sub-meter horizontal accuracy for locations up to 260 km away from the designated EGNOS station (see references) which makes them suitable to support applications in the transportation, mapping and emergency services domains over a large geographical area in Europe. Additionally, in the precision agriculture context, the EDAS differential GNSS corrections can support pass-to-pass accuracies in the order of 20 cm in a consistent manner and with a high degree of repeatability (appropriate for most cereal farm operations). Moreover, for the users located within 40-50km from the EGNOS stations, the EDAS Ntrip service also enables RTK positioning.
Until July 16th, 2018, the EDAS Ntrip service was based on version 2.0 of Ntrip protocol over RTSP/RTP, which uses the Internet Standard Protocol RTSP (Real Time Streaming Protocol) for stream control and RTP (Real-Time Transport Protocol) for data transport.
Since July 17th, 2018, EDAS was upgraded so that the EDAS Ntrip service is now supporting the HTTP-based Ntrip protocol options (Ntrip v1 and Ntrip v2 over HTTP). This facilitates the access to EDAS to a larger number of users. The upgraded EDAS Ntrip service detects requests from registered users in the different protocol versions/options (Ntrip v1, Ntrip v2 over HTTP and Ntrip v2 over RTSP/RTP) and reacts accordingly for the connection request management and GNSS data transmission. Users can directly benefit from this new feature. No modifications or configuration changes are required on the user side.
Everybody is invited to use the updated EDAS Ntrip service, which can provide an added value for a wide range of applications/customers. The other EDAS services (SISNeT, FTP, Data Filtering, Service Level 0 and Service Level 2) remain available as before.
To obtain an EDAS account, the following steps are needed:
- Register at the EGNOS User Support Website
- After logging into the website with the credentials, complete the online EDAS registration form (Services -> EDAS Service -> Registration).
For a more detailed description of the EDAS Ntrip service, please refer to the EDAS Service Definition Document (SDD).
References:
For a high level description of EDAS, its services and the conditions of access, please refer to the EDAS Service Definition Document (SDD).
