EDAS Technical information

Data available from EDAS

EDAS is the single point of access for the data collected and generated by the EGNOS infrastructure composed of ground stations (currently 39) distributed over Europe and North Africa. The three main types of data provided by EDAS are:

  • Raw GPS, GLONASS and EGNOS GEO observations and navigation data collected by the entire network of Ranging and Integrity Monitoring Stations (RIMS) and Navigation Land Earth Stations (NLES)
  • EGNOS augmentation messages, as normally received by users via the EGNOS Geostationary satellites

In addition, EDAS provides the Antenna Phase Centre Coordinates , which is a list of the geographical coordinates of all RIMS stations.

Raw observations from RIMS network

The data collected by the RIMS network includes dual-frequency GPS data, GLONASS L1, and EGNOS Geostationary Signal in Space (SIS). For each RIMS, and each satellite tracked a set of observables is provided. Therefore at any one time information from each RIMS will be provided with a set of observables from visible satellites. The raw data can be provided in both ASN.1 and RTCM format. This data is provided by EDAS in real-time with an update rate of one second. Each message contains a variable number of sections (depending on the number of tracked satellites). The summary table below lists all the raw observables provided from the RIMS network, described in the map below:

EDAS-map

EDAS table

EGNOS augmentation message

This is the EGNOS augmentation message as uplinked and broadcast from the EGNOS geostationary satellites. The augmentation message from EGNOS has been internationally standardized along with any other Space-Based Augmentation System (SBAS). Therefore its content and format is defined precisely in the following public document: Minimum Operational Performance Standards for Global Positioning System/Wide Area Augmentation System Airborne Equipment, Ref. RTCA DO-229, Revision D, Issued 13 December 2006. The EGNOS augmentation message is formed of a number of distinct message types containing various aspects of the overall augmentation message. The message types provided are summarised in the table below. The EGNOS augmentation message is transmitted per second and each message is 250 bits long. In an EDAS message, the previous four augmentation messages transmitted are also provided.

Type Contents
0 Don't use for safety applications (for SBAS testing)
1 PRN Mask assignments, set up to 51 of 210 bits
2 to 5 Fast corrections
6 Integrity information
7 Fast correction degradation factor
9 GEO navigation message (X, Y, Z, time, etc.)
10 Degradation Parameters
12 SBAS Network Time/UTC offset parameters
17 GEO satellite almanacs
18 Ionospheric grid point masks
24 Mixed fast corrections/long term satellite error corrections
25 Long term satellite error corrections
26 Ionospheric delay corrections
27 SBAS Service Message
28 Clock-Ephemeris Covariance Matrix Message

RIMS Antenna Phase Centre Coordinates

The Antenna Phase Centre Coordinates of all RIMS stations are provided in a dedicated message. The coordinates are expressed as Earth-Centered, Earth-Fixed (ECEF) Cartesian coordinates in the World Geodetic System 1984 (WGS84) reference system. This data therefore consists of a set of WGS84 coordinates for 34 RIMS stations.

EDAS V2 Services

EDAS Data Filtering Service

The EDAS Data Filtering Service allows EDAS users accessing a subset of the Service Level 0 or Service Level 2 data. The upgraded version 2.0 of the EDAS Client SW allows selecting one of the available predefined groups, which are a subset of the EGNOS stations, and the data rate of the received messages. This means that EDAS users can be subscribed to a predefined group of RIMS and retrieve data from these set of stations at 1Hz or 1/30 Hz.

In consequence, EDAS users may access to the EGNOS data as received by a certain set of EGNOS stations (group), reducing the bandwidth consumption and amount of data to be processed on the user side.

The list of groups available and they way to access to this EDAS Service can be found by registered users in EDAS Client SW User Manual at the “EDAS Documentation & SW” tab within the EDAS section of this website.

EDAS SISNeT Service

The EDAS SISNeT service provides access to the EGNOS GEO satellites messages transmitted through internet using the SISNeT protocol. The SISNeT protocol has been defined by ESA and the full description of the protocol (SISNeT User Interface Document) can be found at http://www.egnos-pro.esa.int/Publications/SISNET/SISNET_UID_3_1.pdf.

Specific guidelines for the access and usage of the EDAS SISNeT service are available in the EDAS SISNeT-User Information Package for registered users located at the “EDAS Documentation & SW” tab within the EDAS section of this website.

EDAS FTP Service

The EDAS FTP Service enables EDAS users to get EDAS/EGNOS historical data (starting as of the 1st of March 2013) in different formats and data rates. The different sets of data available for download, as well as their format, their content data rates and the periodicity in which those files are published in the FTP, are summarized hereafter.

Data Set Format Rate Periodicity
GPS & GLONASS Observations for RIMS A&B stations. RINEX 2.11 1 sec 15 min
30 sec 1 day
GPS and GLONASS Navigation Files for RIMS A&B Stations and consolidated RINEX 2.11 - 1 day
EGNOS messages RINEX-B 1 sec 1 day
EMS 1 sec 1 day
EDAS SL0 raw ASN.1 1 sec 15 min
EDAS SL2 raw data RTCM 3.1 1 sec 15 min
Ionospheric data IONEX 1.0 2 hours 1 day

 

EDAS users may access this service using a standard FTP client. Specific guidelines for the access and usage of the EDAS FTP service, including naming conventions and folder structure, are available for registered users inEDAS FTP-User Information Package at the “EDAS Documentation & SW” tab within the EDAS section of this website.

EDAS NTRIP Service

EDAS-based NTRIP service retrieves GPS and GLONASS raw measurements from the EGNOS stations (RIMS and NLES) and disseminates this information through the NTRIP (version 2.0) protocol in RTCM 3.1, RTCM 2.1 and RTCM 2.3 formats. NTRIP is an RTCM standard designed for disseminating differential correction data (e.g. in the RTCM-104 format) or other kinds of GNSS streaming data to stationary or mobile users over the Internet, allowing simultaneous PC, Laptop, PDA, or receiver connections to a broadcasting host. NTRIP supports wireless Internet access through Mobile IP Networks like GSM, GPRS, EDGE, or UMTS.

 

Detailed information for the connection and usage of the EDAS NTRIP service are available for registered users in the EDAS NTRIP-User Information Package located at the “EDAS Documentation & SW” tab within the EDAS section of this website.