RECEIVER TECHNOLOGY

Contents
How do I know if I receive EGNOS
Are EGNOS and WAAS compatible?

EGNOS is pre-operational since mid 2005. Many receiver manufacturers already propose chipsets and receivers compatible with EGNOS and WAAS. A preliminary list of EGNOS-compatible receiver manufacturers is included below:

The above table gives an overview of the manufacturers, their main markets and products (receivers or OEM boards).
All receiver manufacturers are welcome to contact the ESSP to provide comments on the above table. The inclusion of additional information (weblinks, product descriptions) can also be discussed.

A comprehensive list of SBAS compatible receivers have been compiled by the European Space Agency (ESA).

The following questions were raised frequently to the ESSP, regarding the status of EGNOS and the reception of SBAS Signals.


How do I know if I receive EGNOS?

EGNOS users can benefit from the full range of EGNOS benefits, once the EGNOS-compatible receiver has been able to connect with the available EGNOS (WAAS) geostationary satellites. The satellites in view are usually referenced on the GPS receiver user interface by their PRN (Pseudo Random Noise) code.

Here is the list of EGNOS (and WAAS) geostationary satellites with their corresponding PRN codes:

The NASA website provides a 3-Dimensional view of the position of all satellites orbiting around the Earth, through an easy-to-use Java applet named J-Track 3D. All the above-mentioned satellites, as well as all GPS satellites  are registered in the program database. To access this application, click here.

Are EGNOS and WAAS compatible?

For the system to be truly global, interoperability is a key requirement. EGNOS and WAAS specifications were determined to a large extent by the civil aviation community. To ensure global compatibility in civil aviation, the use of radio navigation aids is governed by the ICAO (International Civil Aviation Organisation) Standards and Recommended Practises (SARPs). One of the most important requirements was to ensure that any properly equipped aircraft could benefit from these two regional systems by installing a single receiver. RTCA Inc have developed the Minimum Operational Performance Standards (MOPS) for EGNOS and WAAS equipment. The main reference document is DO229 version C. This document describes the standards for all EGNOS/WAAS receivers. Receivers complying with these requirements, as determined by the appropriate Technical Standard Order (TSO) provide full EGNOS/WAAS compatibility. In its full operational configuration, EGNOS is compliant with the RTCA specifications and the ICAO SARPs for use in civil aviation.

What are the Messages Type 0 and 2 (MT0 and MT0/2), depicted in SBAS receivers?

EGNOS Message Types (MT) on the receivers define the nature of the signals and indicate the nature of the use enabled by the Signal In Space (SIS). The Message Type 0 (MT0) is used to indicate that the system is on test and can not be used for any safety critical applications. This signal falls under the MOPS Do229A. Since April 2003, there is an additional signal, described as Message Type 0/2. It consist of a new message type providing fast corrections, ionosphere corrections and ranging data. For practical distribution, it is overlapping the frame of Message Type 0 (MT0). It indicates that the system is on Test Mode, but is also optimizes the use of the SIS data capacity. Their are a substantial number of receivers able to process EGNOS MT0/2 (Open Access Service), it is implemented under the MOPS Do220C. For more information about Message Types and receivers, please visit www.asqf-gnss.com

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