EXPERTS AGREE SATELITTE AGRUMENTANTION STANTARD TO GIRD GLOBE
EXPERTS AGREE SATELITTE AGRUMENTANTION STANTARD TO GIRD GLOBE
News from ESA
The US GPS global satellite navigation system has an accuracy of 5–10 m. Across our continent that accuracy is greatly sharpened to 1-2 m through the European Geostationary Navigation Overlay Service (EGNOS), an operational precursor to Europe’s coming Galileo global satnav system. EGNOS broadcasts augmented information through a trio of geostationary satellites linked to a network of monitoring ground stations. Copyright: ESA
More than 30 specialists overseeing the world’s five satellite navigation augmentation systems gathered in Russia last week, planning for a high-performance future with many more navigation satellites in orbit.
The Satellite-Based Augmentation Systems (SBAS) Interoperability Working Group was hosted 25–27 June in St Petersburg by Russia’s Roscosmos space agency and the Russian Academy of Sciences.
There’s satellite navigation and then there’s satellite augmentation – where additional ground monitoring stations and satellite transponders are applied to sharpen satnav accuracy and reliability across given geographical regions.
This enhancement makes satnav suitable for the guidance of aircraft and a range of other precision applications, giving users robust confidence in the signals they receive.
Today there are three certified SBAS in operation worldwide: the US Wide Area Augmentation System (WAAS), Japan’s Multi-functional Satellite Augmentation System (MSAS) and Europe’s Geostationary Navigation Overlay Service (EGNOS), the last designed by ESA then turned over for operation by the European Satellite Service Provider, ESSP.
Two more are under development in Russia and India: the Roscosmos-designed System of Differential Correction and Monitoring (SDCM), and the GPS and Geo-Augmented Navigation (GAGAN) system, the work of Indian Civil Aviation and India’s ISRO space agency.
Meeting twice yearly, the task of the Working Group is to ensure that the various systems work together on a standardised basis, so end-users can pass seamlessly between them.
Setting a common future standard
“The Group’s terms of reference include developing a shared vision for future generations of these systems,” commented Didier Flament, representing ESA.
“The future will see many more navigation satellites in place. So among the most important achievements of the meeting was agreeing a common SBAS message based on dual-frequency multiconstellation (DFMC) signals from up to four constellations – GPS, Galileo, Compass and GPS, Galileo, Compass – for the post-2020 era.
“Field tests by our Japanese colleagues using GPS and Glonass combined with MSAS are confirming the improved performance expected from this DFMC concept.” Two solutions have been studied in parallel, one by ESA and one by the ESA Federal Aviation Authority (FAA).Both have been compared, with a final single definition to be made before the end of this year. This represents a major step forward towards providing a quasi-global SBAS service.”
©Typologos.com 2013. The article belongs to ESA. Copyright of photos has ESA.
