The first NRTK FULL GNSS network in France

This network allows us to market correction services to improve GPS positioning (centimeter level) used by different companies for their professional missions:

  • Surveying, GIS
  • Machine control
  • Agriculture
  • Drones, Robotics
  • Autonomous vehicles
  • Etc

Provide RTK or PPK GPS corrections

The Orphéon network is made up of nearly 220 observation stations, spread over the entire territory of mainland France and the West Indies.

All of our stations form a large balanced GPS network that allows us to deliver centimetric RTK corrections to our many customers to increase the accuracy of their precision GPS in real time or post-processing corrections. Our various services are marketed in the form of subscriptions or hourly packages.

Accuracy and availability

Thanks to its precision and the availability of its real-time GPS RTK corrections, the Orpheon network offers increased productivity to all of its users in the fields of topography, construction, 3D digitization, machine control, precision agriculture and bathymetry, but also for new applications concerning autonomous vehicles, drones (UAV) and connected objects (IOT and M2M).

Géodata Diffusion continues to develop the quality of its services through personalized support, responsive technical assistance and continuous improvement of its infrastructures. Our objective is to offer customers a secure and innovative service, guaranteeing them a high and constant utilization rate wherever they are, throughout the territory.

GPS Accuracy

The natural position provided by a GPS alone, gives a good idea of ​​where it is within a few meters, but is not precise enough to allow precision work. It requires correction so that its precision is increased and usable in agricultural work, topography, machine guidance or in many other areas. See d’other ares See Other areas of application.

Corrections to gain precision

For its accuracy to be increased and usable in agricultural work, surveying, machine guidance or many other application areas (see) It requires corrections.

Precision GPS

We distinguish between two types of GNSS receivers :

  • Consumer receivers (Watches, phones, tablets, cars, etc.) which will work only in natural mode with positioning within ± 5 meters of precision without the possibility of improving their precision thanks to corrections
  • Precision receivers (RTK), which will be able to integrate external data corrections allowing them to obtain centimeter precision.

We offer a full range of services tailored to your needs.

To access the unlimited Real-Time corrections of the Orphéon network, we offer multiple services to choose from NRTK Full GNSS centimetric.

We also offer a PPK Full GNSS online post-processing service for your static or dynamic Rinex files with centimetric precision or the downloading of observation data from our stations (Raw Data) to perform your own post-processing.

With the Orphéon network, you work with identical precision throughout the territory thanks to a uniform distribution of stations in mainland France and the West Indies, regardless of your position in the territory covered.


Real-time corrections

The RTK (Real Time Kinematic) is a device allowing real-time transmission of correction data from an observation base to mobile GPS units through radio communication or via an internet connection.

The mobile will then integrate this information into its positioning calculation to gain precision.

The real strength of the Orpheon network

The NRTK (Network Real Time Kinematic) comes from the use of several bases of observations to optimize and model the information of corrections on the covered area.

  • In network corrections mode for a centimetric GNSS RTK receiver, the positioning accuracy is independent of the distance to the nearest physical network station.
  • With the Orphéon network, you work with identical precision throughout the territory thanks to a cell of several reference stations created around the user and the homogeneous distribution of the stations over all the areas covered, whatever your position.

The data from this network of observation stations is collected in real time on a centralized server. Mobiles connect to the server via mobile internet to get their corrections information.


Corrections for post-processing

PPK (Post Processing Kinematic) to post-process your positioning data with observation data from an observation station.

Raw positioning data (without corrections) is stored in the GPS in Rinex format along with satellite observations such as satellite ID, frequency (L1/L2/L5, etc.), constellation, pseudorange, carrier phase, Doppler and signal-to-noise ratios.

RINEX (Receiver Independent Exchange Format) as its name suggests is a standardized format for storing positioning and observation data independent of the brand of the receiver and thus making it possible to post-process this data afterwards to obtain corrected positions. much more precise.

Observation stations

Orpheon is the first French multi-constellation network in France.

With its 215 stations in mainland France, all Full GNSS: GPS, GLONASS, Galileo and BeiDou with a historical presence in the French West Indies.


Click on the map to access the interactive network map

Orpheon satellite positioning correction system is based on a network of observation reference stations (OSR: Observation Space Representation) spread over the territory, each position of which is known with precision.

All the observations of this network are concentrated on a computing center to deliver to each user corrections allowing him to obtain a much more precise positioning.

OSR services offer positioning accuracy to the nearest centimeter, within the network or within 30 km of the nearest reference station (in single station mode).

A very regular presence, without compromise and without equivalent in France.

The careful choice of layout for each of our 215 reference stations creates a linear and regular geometric mesh. Territory coverage is uniform wherever you are.


A regular and homogeneous layout

With the Orphéon network, you work with identical precision throughout the territory thanks to a uniform distribution of stations over all the areas covered, whatever your position, the distance from the nearest reference station is never more than 30 km.

You receive corrections from a combination of multiple stations for greater stability and accuracy. There is only one hardware configuration to connect to the network anywhere in France, it is our server which is responsible for automatically establishing the cell of observation stations that suits you.

The Orphéon network thus stands out significantly from its competitors who are multiplying the number of reference stations because of their disorderly location on the territory and whose coverage is losing homogeneity, sometimes leaving very large distances in the meshes of their network.

Reinforced coverage

This coverage is reinforced at the borders thanks to the sharing of reference stations of our international Hxgn SmartNet network with:

          • Belgium
          • Luxembourg
          • Germany
          • Swiss
          • Italy
          • Spain

Integration into a large European network

To guarantee a continuous service of constant quality throughout the territory, we share the reference sites within the European network of our Hexagon group.

This European network allows us to integrate additional reference stations and extend the coverage of the Orphéon network for French customers. In this way, even near a border, it is possible to work in a network while being within an RTK cell (and no longer in extrapolated mode).

The highest availability rate on the market

The strength of the European network is to share infrastructures and the most qualified technical teams to guarantee identical control procedures over the entire coverage area, continuous and regular reinforced monitoring of all stations and the network. This international technical team from a major manufacturer is responsible for supervising all installations 24 hours a day, 365 days.

International expertise covering many countries

By integrating the Hexagon group in 2014, the Orpheon network joined a vast network of reference stations within the first operational European NRTK network covering many countries.

On the strength of its international experience and its expertise in real-time positioning, the Hexagon group, within its various companies, intends to offer the most uniform and extensive real-time positioning service with centimetric precision.

High quality centimetric precision

Based on L1, L2 and L5 frequencies emitted by satellites to make positioning more resistant to interference and signal reflections, especially in an urban environment.

Concretely, the initialization time and the delay to fix or convergence are significantly reduced as well as the repositioning times in the event of disconnection. The use of multiple frequencies allows better rejection of repair signals, which makes it possible to process a maximum of direct signals, which provides greater precision and greater positioning repeatability.

Positioning accuracy with Orphéon is centimetric for a standard deviation of 1σ :

          • between 1 and 2 centimeters in planimetry (Lambert 93).,
          • between 2 and 3 cm in altimetry (IGN69).

Technically :

The fact of working in a network makes it possible to obtain, in a few seconds, a homogeneous precision on all the zones covered, whatever the distance separating the mobile from the nearest station. The system is compatible with the vast majority of mobile receivers on the market insofar as the corrections are broadcast in standard formats:

In a standardized format (RTCM3) or in well-defined proprietary formats (CMR/CMR+, MAX, iMAX, LB2)
Following network computing concepts, also well defined and standardized (MAC).

Full GNSS network and services


The infrastructure and the calculation software allow us to deliver positioning corrections for the different GNSS constellations :


100% more satellites

The addition of the Galileo and BeiDou satellites to the GPS and GLONASS satellites now makes it possible to double the number of satellites that can be observed simultaneously by a GNSS antenna.

The addition of the GALILEO and BeiDou constellations thanks to the Orphéon network is not a simple gadget, but the assurance of better daily productivity in the field.

Indeed, you can now count on the constant availability of at least 20 satellites at all times to bring you real advantages:

Improved positioning quality

          • More satellites available to calculate its position
          • Precise positioning even in difficult environments (urban canyons for example or under a canopy)
          • Improved positioning reliability
          • Shorter fixing time
          • Multi-frequency L1/L2 and L5

Everything has been thought out to allow you to benefit from increased productivity.

          • Centimeter accuracy corrections for GPS GNSS
          • Use of L1/L2 and L5 frequencies
          • Real time, very fast convergence time
          • A dense and homogeneous RTK network
          • A regular and geometric layout throughout the territory
          • An infrastructure designed for service performance
          • Very secure facilities
          • National and West Indies coverage
          • A reference for professionals
          • Accuracy, Stability, Availability, Repeatability
          • Increasingly varied applications

Increasingly varied fields of application

Initially created for Surveyors

Today used daily by professionals from different backgrounds, the Orpheon network has become over the past ten years, more than a tool for a multitude of varied applications. Its centimetric precision, its stability and its availability make it a recognized reference throughout the country.

Topography, construction, 3D digitization, machine guidance, precision agriculture and bathymetry, but also for new applications concerning autonomous vehicles, drones (UAV) and connected objects (IOT and M2M) . Every day, new users come to join the service and thus begin to realize savings.

  • null

15 years of presence in the West Indies

The West Indies have always been the subject of particular attention at Geodata Diffusion, it is moreover in this region that the Full GNSS service was offered for the first time in preview…… (find out more +: read the article)

Territorial development assistance

We were the only ones to install an RTK network which contributes to help concretely and materially the development of these territories without seeking direct benefits given the small number of potential customers and the importance of the investments relating to the deployment and daily operation of such a network.

A local referral system :

the Orphéon network will use the new official national reference system for the West Indies: the RGAF09.

The RGAF09 (Géodesic Network of the French West Indies 2009) thus replaces the WGS84-RAAF91

(for more info,

International technical support at your service

This secure infrastructure, set up and managed by the Hexagon group, allows the pooling of technical support resources within the group for all the countries whose management is centralized.

This organization also makes it possible to offer a service available 24/7 and to offer one of the highest availability rates on the market.

The Orpheon network in detail :