GNSS technology

The Global Navigation Satellite System (GNSS) enables users with compatible receivers to determine their position, speed and local time by processing signals from satellites located at specific points in space. GNSS signals are provided by satellite systems called core constellations.
The current core constellation systems are the United States' GPS, Europe's Galileo, Russia's GLONASS and China's Beidou. Technologies such as DGNSS, RTK and PPP improve accuracy, while ABAS, GBAS and SBAS, in addition to improving accuracy, ensure integrity, a measure of confidence in the accuracy of the information.
The use of GNSS position, navigation and timing information depends on operational requirements and encompasses different sectors such as aviation, maritime, road, rail, agriculture, consumer location services, geo-training, timing and synchronization, as well as drones and the Internet of Things (IoT).

SBAS technology

Global Navigation Satellite System (GNSS) systems, when used alone, have a number of limitations, most importantly, they cannot be used for case studies which have strict requirements in terms of accuracy (less than 10 metres), integrity, continuity and availability.
SBAS, one of the existing augmentation systems, provides error correction information via geostationary satellites to users of the primary GNSS system services, making it compliant with specific case study requirements such as the operational requirements set by the International Civil Aviation Organisation (ICAO) for use during the most critical phases of aircraft flight.
SBAS has been implemented or is being implemented in several regions of the world. WAAS (USA), EGNOS (Europe), MSAS (JAPAN) and GAGAN (India) are in operation while SDCM (Russia), KASS (South Korea), BDSBAS (China) and ASECNA ANGA in Africa are being developed and deployed.

EGNOS technology

EGNOS services are currently provided in Europe and include:
•Firstly, the "EGNOS Open Service (OS)" for any user with an EGNOS receiver in the EGNOS Open Service area
• secondly, the "Safety of Life (SoL) Service" with performance adapted to safety-critical transport cases, especially aviation
• the "EGNOS Data Access Service (EDAS)" is a commercial data service that provides access to EGNOS data to authorised users via a ground transmission network.


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