GNSS Network Subscriptions
Permanent GNSS networks
To geotag with centimeter accuracy during surveys, a GNSS network or robotic optical total station must be available. The use of mobile GPS stations is sometimes difficult: deep valleys, steep slopes, streams, obstacles, vegetation along the banks, etc. The use of DGPS (Differential Global Positioning System) is almost mandatory, but it presents other operational constraints such as the need to maintain a radio link to communicate real-time corrections and the need to move the station regularly (or evenly place several). GNSS networks were created to ease these constraints.
Permanent GNSS network stations store data from all available satellites. They then calculate the atmospheric measurement errors and deduce the corrections which should be applied. Corrections are sent to mobile receiving stations via GSM 3G or 4G. There are several such networks in France.
GPS/GNSS permanent networks provider in France
The Orpheon network ensures identical accuracy throughout the country thanks to a homogeneous distribution of reference stations.
All the stations as well as computing platforms and, consequently, the service delivered by Orpheon are Full GNSS (GPS, Glonass, Galileo and Beidou).
Orpheon also offers an online post-processing service with the result directly in the national reference.
Real-time GPS correction system in France
Launched by the French Expert Surveyor Organization (OGE) to facilitate the work of its members, it has about 200 ground stations evenly distributed over the national territory of France. Teria antennas are compatible with GPS/GLONASS (and soon Galileo) to ensure maximum observation. This network provides an accuracy of one centimeter.
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