European Geostationary Navigation Overlay Service
- European Geostationary Navigation Overlay Service
The European Geostationary Navigation Overlay Service (EGNOS) is a satellite based augmentation system (SBAS) under development by the European Space Agency, the European Commission and EUROCONTROL. It is intended to supplement the GPS, GLONASS and Galileo (when it becomes operational) systems by reporting on the reliability and accuracy of the signals.
According to specifications, horizontal position accuracy should be better than 7 metres. In practice, the horizontal position accuracy is at the metre level. It will consist of three geostationary satellites and a network of ground stations.
The system started its initial operations in July 2005, showing outstanding performances in terms of accuracy (better than 2 metres) and availability (above 99%); it is intended to be certified for use in safety of life applications in 2008.
Similar service is provided in North America by the Wide Area Augmentation System (WAAS), and in Asia, notably Japan, by the Multi-functional Satellite Augmentation System (MSAS).
On July 28, 2005, the European Space Agency announced it had signed a contract with an operating company, European Satellite Services Provider, to run EGNOS.
As of July 2005, EGNOS has been broadcasting a continuous signal, and at the end of July 2005 the system was again used to track cyclists in the Tour de France road race [http://www.esa.int/esaNA/egnos.html] .
External links
* [http://www.esa.int/esaNA/egnos.html ESA information on EGNOS]
* [http://www.egnos-pro.esa.int/education/book.html The EGNOS book]
* [http://www.egnos-pro.esa.int/index.html European Space Agency information on EGNOS for Professionals]
* [http://www.egnos-pro.esa.int/education/index.html Learning EGNOS]
* [http://asqf-gnss.com/ EGNOS Operations User Support]
* Usman A Zahidi, "EGNOS enabled GPS Software Receiver" Report Page, [http://kom.aau.dk/~usman/EGNOSSoftwareReceiver.pdf ]
* [http://www.environmental-studies.de/Precision_Farming/EGNOS_WAAS__E/3E.html Information on WAAS, EGNOS & MSAS]
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