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In your professional practice, to meet your missions and obligations, you can count on the knowledge, know-how, centimetric precision and repeatability provided by the Orphéon network. The high precision that the GNSS RTK Orphéon network provides to Topography professionals, makes it possible to carry out quality surveys with complete confidence, but also facilitates and simplifies the management of construction sites or interventions in the field. null Positioning accuracy with Orpheon is centimeter for a standard deviation of 1σ:
  • Included between 1 and 2 centimeters in planimetry,
  • Included between 2 and 3 cm in altimetry.

In various theses on “TOPOGRAPHIC WORKS” it is highlighted that the use of a “real-time GPS” is sufficient for the realization of topographic works of precision class 10 cm within the meaning of the decree of September 16, 2003 (Class A), only within the limits of use of the equipment (pay attention to the close environment) and the limit of implementation of survey methods (see our field phase recommendations below).

Download the technical sheet

Referencing and external control of the network

The referencing of the sites and the monitoring of their stability is ensured by the RENAG, National Observatory, implementing and using continuous GPS measurements for scientific purposes such as: measurement of weak crustal deformations, study of the vapor content of atmospheric water, study of oceanic and hydrostatic overload or even study of gravitational movements. Géodata Diffusion is a private partner of RENAG (see the RENAG website)

Stationing procedure

After the final installation of a reference station on a new site or after maintenance, we obtain an initial approximate position of this site by observations over a minimum period of 72 hours. This duration makes it possible to obtain the first coordinates of the site. Then these observations are conducted over a month in order to acquire the time series that will be used to calculate the position using the Bernese GNSS software: high-precision scientific multi-GNSS data processing software developed at the Astronomical Institute of the University of Bern (AIUB). All the sites are referenced in the RGF93 via a “state of the art” procedure from the stations of the RGP (Permanent GNSS Network). We then obtain the position and the precise three-dimensional coordinates of the site which we can then integrate into the network to deliver the correction services.

Self-checking and monitoring

On a daily basis, we monitor 24 hours a day, all year round, the positioning of each of our reference stations using monitoring tools integrated into our correction calculation platforms (Spider and/or TPP). The monitoring of each of the reference stations is then carried out on a regular basis in order to control the stability of the sites. Internal quality control procedures are carried out regularly. In the field, we regularly check and compare the corrections obtained from the network by positioning ourselves with a mobile GNSS receiver, as our customers would do, on known points such as IGN terminals whose three-dimensional coordinates are known with precision.

Automatic alerts

The entire network is monitored 24 hours a day and alerts are sent in real time to our technical support as soon as a movement or shift of a reference station is observed by the system. Our team is then able to intervene to ensure that a constant quality of service is maintained over time.
(Source lettres IGN GEODINFO) The RGF93 is the French Reference:
  1. three-dimensional geocentric
  2. linked to the global ITRS reference system
  3. associated with the IAG GRS 1980 spheroid
  4. having as its prime meridian the International Meridian (or Greenwich Meridian)
  5. having as associated projections the Lambert-93 projection and the CC 9
  6. Zones projections
  7. horizontal accuracy between 1 and 2 cm (compared to global systems)
  8. vertical accuracy between 2 and 5 cm (compared to global systems)
  9. suitable for modern positioning techniques

Since January 2021 :

In 2019 and 2020, IGN carried out the IGS14 reprocessing and cumulation of the Permanent GNSS Networkexternal link. This has led to the release of a new RGF93, named RGF93 V2b, which is aligned with ETRF2000 epoch 2019.0. This replaces in January 2021 the RGF93V2 benchmark, which was directly compatible with the ETRF2000 era 2009.0.

In 2010 :

A first readjustment to the European system took place in 2010, following the re-observation of the base network (RBF) systematically using the Permanent GNSS Network. The published coordinates are then expressed in a version 2 of the RGF93 frame which corresponds to the ETRF2000 at the epoch 2009.0.

Impact:

The impact of this update is mainly reflected on the ellipsoidal heights and, consequently, on the evolution of the elevation conversion surface.

RAF20:

Since the summer of 2021, you can therefore download this new ‘grid’ from the IGN website (https://geodesie.ign.fr) which takes into account both the evolution of the RGF93 benchmark (ETRF2000 ep.2019.0) and the last two ERNIT field campaigns 2019 and 2020 in mainland France. IGN is also trying to improve the model at each occurrence by introducing some minor corrections from reports or redeterminations caused by local tectonic activity. For mainland France, the RAF20 altimetric conversion surface was updated at the end of 2021 to take into account the maintenance operations of the RGF93 reference mark Pour la Corse, la surface de conversion altimétrique RAC09 reste en vigueur.

The RGF93 is the French Reference:
  1. three-dimensional geocentric
  2. linked to the global ITRS reference system
  3. associated with the IAG GRS 1980 spheroid
  4. having as its prime meridian the International Meridian (or Greenwich Meridian)
  5. having as associated projections the Lambert-93 projection and the CC 9
  6. Zones projections
  7. horizontal accuracy between 1 and 2 cm (compared to global systems)
  8. vertical accuracy between 2 and 5 cm (compared to global systems)
  9. suitable for modern positioning techniques
In accordance with the official decree, since 2010 the coordinates published by the Orpheon network are expressed in the new realization of the RGF93. v2 The RGF (French Geodesic Network) is the legal geodetic system in metropolitan France. The RGF is made up of a reference network, the RGP (Permanent Geodesic Network: http://rgp.ign.fr/).
  • RGF93.v1: ETRF2000 solution at date:t0=1993.0
  • RGF93.v2: ETRF2000 solution at date:t0=2009.0
As part of the operation of the services of the Orphéon network, the transition from RGF93v1 to RGF93v2 led to a change in the coordinates of all the stations of the Orphéon network. The IGN had been commissioned in 2010 by Geodata Diffusion to calculate the RGF9.v2 coordinates for the existing Orphéon stations. Today, the coordinates are updated by solutions from the HxGN SmartNet CrossCheck service. The calculations performed by this service use a Bernese solution. This software is used in particular by the IGS CODE analysis center (Center for Orbit Determination in Europe) which participates in the supply of orbitographic products integrated into the ITRF solution. The quality of the coordinates of the Orphéon stations is of the order of a few millimeters. Since September 2018, the coordinates of the stations of the Orphéon network have been calculated by Hxgn SmartNet Crosscheck in the realization of the ITRF2014 epoch 2010.0 In conclusion, the calculations of the platforms operating the Orpheon services must be carried out in the ITRF, but the solutions delivered are expressed in the official RGF93v2
In metropolitan and continental France, the legal geodetic system is RGF93v2 which corresponds to the ETRF2000 system epoch 2009.0. All the coordinates of our stations are defined in this system. The associated ellipsoid is GRS80. The legal projection is the Lambert 93 9 zone conformal conic projection. Each of these zones covers a latitude band of 2°. The titles of the 9 zones are: CC42/CC43/CC44/CC45/CC46/CC47/CC48/CC49/CC50. “CC” for conformal conic followed by the value of the zone’s central parallel. For example, CC48 covers a band in latitude going from parallel 47°N to parallel 49°N. The definition of these 9 zones ensures an overlap of 1° between each zone. The parameters of these projections are: – Origin latitude: 42/43/…/50 depending on the area considered – Automecoic parallel 1: Origin latitude – 0.75° – Automecoic parallel 2: Origin latitude + 0.75° – Prime Meridian: 3°E – Origin coordinates: 1,700,000 E; (1,000,000 x (origin latitude – 41°)) + 200,000 N In terms of altimetry, the legal system is IGN69, a system of normal altitudes. The Ellipsoidal Heights -> Normal Height transformation grid is RAF09. This grid is an improved version of the QGF98 quasi-geoid. This grid is available in ASCII format at: https://geodesie.ign.fr/contenu/fichiers/documentation/grilles/anciennes/RAF18.mnt
The French Antilles now have a legal and precise national coordinate reference system, compatible with the international terrestrial reference system ITRS, ensuring the interoperability of geographical data, in accordance with the INSPIRE directive. The decree of March 5, 2019 formalizes the legal and precise national coordinate reference system for the Antilles, the RGAF09. The RGAF09 (Réseau Géodésique des Antilles Françaises 2009) thus replaces the WGS84-RAAF91, which remains however usable for an overlay period of three years. RGAF09 is a significant improvement over WGS84. Indeed, it had inconsistencies of several centimeters between the islands as well as an offset of about 70 cm with the International Terrestrial Reference System (ITRS).

RGAF09 as standard on the Orphéon network

As of Monday, December 16, 2019 at 06:30 UTC the Orpheon network uses RGAF09

the new official national reference system for the West Indies: the WGS84-RGAF09. The decree of March 5, 2019 formalizes the legal and precise national coordinate reference system for the West Indies, WGS84-RGAF09. With the officialization of the long-awaited RGAF09 and the improvement it presents the Orpheon network has been updated to offer the new official coordinate system for the Antilles.

Directly in RGAF09

The change is direct without user intervention. No modification is therefore necessary for customers using the Orphéon network, as soon as they connect to the network, the coordinates will be expressed directly in the new official reference WGS84-RGAF09.

The RAAF91 – Always Available

However, for more than 10 years the Orpheon network has been working in the national coordinate reference system WGS84-RAAF91 which will therefore remain valid for another 3 years. Professional network users have become accustomed to using Orpheon and have configured their equipment and their work accordingly. We keep this possibility not to suddenly upset the work of many professionals.

Keep the old reference system RRAF91

Some network users may still need to work with the old RRAF91 reference system for a while longer, to complete a job or resume an old survey without having to do any prior conversion.

We thought of them:

We provide you with new mounting points allowing you to work in the old reference system. Reverting to RRAF91 will require setting up your hardware by selecting one of the new mount points that matches your setup.
      • RRAF91_i-MAX_3.0_GG
      • RRAF91_i-MAX_MSM_FULL
      • RRAF91_VRS_3.0_GG
      • RRAF91_VRS_MSM_FULL
      • RRAF91_MAX_3.0_GG
      • RRAF91_FKP_3.0_GG
      • RRAF91_Plus-Pres_3.0_GG
      • RRAF91_Plus-Pres_MSM_FULL
To avoid confusion, note that the names of these new mount points always begin with RRAF91.

Confusions and changes

The coexistence of two coordinate reference systems in parallel leads to some confusion that we too have seen. Some of our customers have recently reported to us an Orphéon RTK real-time and post-processing positioning problem in Guadeloupe related to the use of different coordinate systems in the same project. They were thus able to observe differences of the order of 60 cm. But as soon as the points used in a project are expressed in the same coordinate system, things get back to normal and customers find all the precision of the Orpheon network. Projects must be treated in their entirety in a single coordinate system, without being mixed.

Coordinate transformation:

It is possible to use our online transformation tool or IGN provides the transformation parameters from local systems and WGS84-RRAF to the RGAF09 system as well as a CIRCE tool.

RGAF09 as standard on the Orphéon network

As of Monday, December 16, 2019 at 06:30 UTC the Orpheon network uses RGAF91

the new official national reference system for the West Indies: the WGS84-RGAF09. The decree of March 5, 2019 formalizes the legal and precise national coordinate reference system for the West Indies, WGS84-RGAF09. With the officialization of the long-awaited RGAF09 and the improvement it presents the Orpheon network has been updated to offer the new official coordinate system for the Antilles.

Directly in RGAF91

The change is direct without user intervention. No modification is therefore necessary for customers using the Orphéon network, as soon as they connect to the network, the coordinates will be expressed directly in the new official reference WGS84-RGAF09.

The RAAF91 – Always Available

However, for more than 10 years the Orpheon network has been working in the national coordinate reference system WGS84-RAAF91 which will therefore remain valid for another 3 years. Professional network users have become accustomed to using Orpheon and have configured their equipment and their work accordingly. We keep this possibility not to suddenly upset the work of many professionals.

Keep the old reference system RRAF91

Some network users may still need to work with the old RRAF91 reference system for a while longer, to complete a job or resume an old survey without having to do any prior conversion.

We thought of them:

We provide you with new mounting points allowing you to work in the old reference system. Reverting to RRAF91 will require setting up your hardware by selecting one of the new mount points that matches your setup.
      • RRAF91_i-MAX_3.0_GG
      • RRAF91_i-MAX_MSM_FULL
      • RRAF91_VRS_3.0_GG
      • RRAF91_VRS_MSM_FULL
      • RRAF91_MAX_3.0_GG
      • RRAF91_FKP_3.0_GG
      • RRAF91_Plus-Pres_3.0_GG
      • RRAF91_Plus-Pres_MSM_FULL
To avoid confusion, note that the names of these new mount points always begin with RRAF91.

Switch from RRAF91 to RGAF09?

Coordinate transformation:

It is possible to use our online transformation tool or IGN provides the transformation parameters from local systems and WGS84-RRAF to the RGAF09 system as well as a CIRCE tool. Helmert parameters necessary for the transformation of coordinates expressed in old systems to RGAF09. IGN provides the parameters needed to transform RRAF91 coordinates into RGAF09 and vice versa. It is therefore possible to indirectly link GNSS work carried out in other systems to the RRAF91 reference. The table below lists the values ​​of these parameters. Note in particular the values ​​of the translations between the RRAF91 and the RGAF09 which differ up to 10 m depending on the area concerned. This testifies to the heterogeneity of the inter-island RRAF91.
Zone Martinique Guadeloupe Guadeloupe Martinique Guadeloupe Guadeloupe
Système de départ Fort Desaix Saint-Anne Fort Marigot RRAF91 RRAF91 RRAF91
Système d’arrivée RGAF09 RGAF09 RGAF09 RGAF09 RGAF09 RGAF09
TX (m) 127.744 -471.060 151.613 0.7696 1.2239 14.6642
TY (m) 547.069 -3.212 253.832 -0.8692 2.4156 5.2493
TZ (m) 118.359 -305.843 -429.084 -12.0631 -1.7598 0.1981
RX (arcsec) -3.1116 0.4752 -0.0506 -0.32511 0.03800 -0.06838
RY (arcsec) 4.9509 -0.9978 0.0958 -0.21041 -0.16101 0.09141
RZ (arcsec) -0.8837 0.2069 -0.5974 -0.02390 -0.04925 -0.58131
D (ppm) 14.1012 2.1353 -0.3971 0.2829 0.2387 -0.4067
Tab. Helmert parameters between Martinique/Guadeloupe local systems and RGAF09 and between RRAF91 and RGAF09. These transformation parameters are included in the IGN software Circé (downloadable from the IGN website http://geodesie.ign.fr/index.php?page=circe#titre1)

As a reminder, in order to be able to position itself within a few centimeters, a GPS/GNSS rover must be able to:

  • perform noise-free phase measurements on at least 5 satellites well distributed in space,
  • and receive differential corrections on these same 5 satellites.
Adding 2 constellations of additional Galileo and BeiDou satellites to those of the GPS and Glonass constellation increases the possibility of receiving a sufficient number of signals and of better quality, especially in difficult places. Here are our recommendations, a sort of checklist which makes it possible to ensure the quality of the points recorded (especially in Z) regardless of the number of constellations used.
  • Control of measurement equipment (Firmware version of GNSS equipment, status of the rod, of the bubble, compliant configuration and configuration)
  • Turn on the mobile and stand on a clear point
  • Ensure good internet connection and service stability
  • Connect to real-time correction services
  • Start a first initialization session of 8 minutes without cycle jumps for 6 satellites being a recommended minimum value for the subsequent fixing of integer ambiguities
  • Centre, bubble, check antenna height and stability
  • Perform measurement work while ensuring GNSS measurement conditions: sufficient number of satellites, GDOP < 3 – 4, Signal/Noise ratio SNR > 50 (on L1) or 40 (on L2)
  • Respect sufficiently long point acquisition times according to the situation, the environment and the place
  • In the event of a cut warning by the receiver or in the event of lifting in a place prone to cuts signal (near trees, buildings, etc.), redo an initialization session
  • Reoccupy the first point at the end of the lift
  • Reoccupy the important points at least once after at least 20 minutes (see control sheet)
  • For the most important or difficult to access points, recording of raw data in Rinex for possible online control post-processing
  • Occupation of all known points in coordinates (RBF, NGF) (see check sheet)
You will also find an article published in XYZ on the subject Real-time static positioning by “filtering and averaging NRTK positions”, Lire l’article  This general method of measurement makes it possible to ensure the quality of the points recorded.
In our recommendations for field phase measurement, we recommend the occupation of all known points in coordinates (RBF, NGF). To know these points near your construction site, the IGN provides you with the location of its terminals as well as a wealth of very useful information for the whole of France., Accès au site de l’IGN  (click to open link) null At Geodata Diffusion, we also use these terminals to regularly check that the corrections we deliver through the Orphéon network comply with the specifications we announce.

On October 26, 2018 for example,

We went to the Lorient region (56) to check the corrections of the Orphéon network and check the potential discrepancies between the data from three IGN terminals and the positions obtained in the field (located on the map above). For each of the sites, we have edited the IGN Geodesic sheet and we are taking readings as follows:
  • Start-up of the measurement equipment and first initialization session of at least 8 minutes.
  • Recording of 6 surveys from the 6 mounting points delivered in GG and Full GNSS. Please note that the correct configuration of the hardware is essential and must correspond to each of the protocols linked to the selected mount point. The risk is to obtain distorted results with erroneous positions (especially in Z).
  • Each point is recorded after at least 60 seconds of acquisition. We then make a 30-minute acquisition in natural mode so that we can then perform a control post-processing (Rinex file recording)
  • We check our measurements one last time by recording at least one additional point with a Full GNSS mount point.

Results on the REDENE reference terminal (56)

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The HDOP, a question of geometry

The positioning accuracy of a satellite navigation system (GPS) is affected by mathematical errors related to the geometry of the observable satellites either because of their position and their distribution above the user.

The idea of ​​geometric DOP (GDOP) is to indicate how measurement errors will affect the final state estimate. DOP can be expressed in a number of distinct measures:
  • HDOP – horizontal dilution of precision
  • VDOP – vertical dilution of accuracy
  • PDOP – position (3D) dilution of accuracy
  • TDOP – temporal dilution of accuracy
  • GDOP – geometric dilution of precision

Benchmarks

These values ​​derive mathematically from the positions of the usable satellites. The signal receivers allow the display of these positions (skyplot) as well as the DOP values

Valeur DDP Classement La description
<1 Idéal Niveau de confiance le plus élevé possible à utiliser pour les applications exigeant la plus grande précision possible à tout moment.
1-2 Excellent À ce niveau de confiance, les mesures de position sont considérées comme suffisamment précises pour répondre à toutes les applications, sauf les plus sensibles.
2-5 Bien Représente un niveau qui marque le minimum approprié pour prendre des décisions précises. Les mesures de position pourraient être utilisées pour faire des suggestions de navigation fiables à l’utilisateur.
5-10 Modérer Les mesures de position pourraient être utilisées pour les calculs, mais la qualité de la correction pourrait encore être améliorée. Une vue plus dégagée du ciel est recommandée.
10-20 Équitable Représente un niveau de confiance faible. Les mesures de position doivent être ignorées ou utilisées uniquement pour indiquer une estimation très approximative de l’emplacement actuel.
>20 Pauvre À ce niveau, les mesures sont imprécises jusqu’à 300 mètres avec un appareil précis de 6 mètres (50 DOP × 6 mètres) et doivent être rejetées.

Sky map

Example of observation of the sky of the GPS and Glonass constellations with a cut-off angle of 45° compared to the sky map in Full GNSS with a cut-off angle of 10°

In case of wrong choice of mounting point:

If the mounting point that you have configured in your equipment does not correspond with the operating mode that you have configured in your equipment either:
  • You will not be able to connect to our servers and therefore you will not be able to obtain a correction. You will therefore not have the expected precision. Your position will remain in natural or floating mode (without correction) the material failing to fix the ambiguities. On the Smartphone application, the symbol locating your equipment will be in red.
  • You will manage to connect to our servers but the corrections you get will be misinterpreted by your equipment. You will therefore not have the expected precision. On the Smartphone application, your position will apparently be fixed (with correction), the symbol locating your equipment will be in green.
It is therefore essential that the configuration of your equipment is checked to match the correction mode expected and configured on your mobile with the corrections delivered by our servers according to the mounting point you have selected. If you change the mounting point, check that you have also adapted the configuration of your equipment so that the 2 correspond well.

Self-check recommendations

In our recommendations for field phase measurement, we recommend the occupation of all known points in coordinates (RBF, NGF). To know these points near your site, the IGN provides you with the location of its terminals as well as a wealth of very useful information for the whole of France, Accès au site de l’IGN  (click to open link) null
  • Control of measurement equipment (Firmware version of GNSS equipment, status of the rod, of the bubble, compliant configuration and configuration)
  • Turn on the mobile and stand on a clear point
  • Ensure good internet connection and service stability
  • Connect to real-time correction services
  • Start a first initialization session (8 minutes without cycle jumps for 6 satellites being one fairly widespread minimum recommended value) for subsequent fixing of integer ambiguities
  • Centre, bubble, check antenna height and stability
  • Perform measurement work while ensuring GNSS measurement conditions: sufficient number of satellites, GDOP < 3 – 4, SNR > 50 (on L1) or 40 (on L2)
  • In the event of a cut warning by the receiver or in the event of lifting in a place prone to cuts signal (near trees, buildings, etc.), redo an initialization session
  • Reoccupy the first point at the end of the lift
  • Reoccupy the important points at least once after at least 20 minutes (see control sheet)
  • Occupation of all known points in coordinates (RBF, NGF) (see check sheet)
You will also find an article published in XYZ on the subject Real-time static positioning by “filtering and averaging NRTK positions” , Lire l’article 
Learn more: Contact our Technical Service who will bring you concrete help and guide you step by step.

Significant solar activity every 11 years

Solar activity follows an eleven-year cycle, with 2015 being a maximum of this cycle. This year 2020 is therefore synonymous with the end of a cycle of reduced ionospheric disturbances for our applications. We must expect in the future to have to deal with increasing solar activity, hence the importance of having a dense network of permanent GNSS stations to properly model this error. As you can see in the graph below, the cycle of solar activity is reaching its minimum and the forecast for this activity is now on the rise:
Le cycle de l'activité solaire de 2002 à aujourd'hui
The cycle of solar activity from 2002 to today During a day, ionospheric activity related to solar activity peaks around 12:00 p.m. solar time. Thus, as shown in the graph below, this ionospheric activity was very high on Wednesday October 2 at noon with I95 index values ​​beyond the limit of 8 indicating very high activity for the targeted applications and therefore impacting all communications satellites during their passage in the ionosphere then rich in charged particles:
Activité ionosphérique
Ionospheric activity

Disturbances related to geomagnetic storms

As you can see on the SpaceWeatherLive.com website, this phenomenon is global with an ionospheric index K (quantification of geomagnetic disturbances). This is an average of the K indices relating to 13 stations located between 44 and 60◦ latitude; it is therefore an overall index. Activité ionosphérique The K index is a local index which characterizes the variation of the magnetic field at the station considered compared to a calm reference day; these measurements are made using magnetometers. The Kp index scale includes 10 rungs: null

The levels of the Kp Index

The impact on your connection

As you will have understood on this subject, if you have problems in the middle of the day (abnormally long time to fix the entire ambiguities or impossibility of fixing them in clear environments, repeated passages while floating even though you receive many corrections, etc. .), check the number and distribution of GPS satellites and check ionospheric activity via the site:http://gpsweather.meteo.be/geomagnetism/ground_K_dourbes. null

The strength of the Orpheon network

Our network is currently built according to the rules of the art with stations every 60 km, you should not normally be too affected. However, we wanted to pass on the information to you, an informed user is worth two!

The geometric regularity of our layouts

The Orphéon network has 215 stations in mainland France, all Full GNSS, i.e.: GPS, GLONASS, Galileo and BeiDou, as well as a historical presence in the French West Indies. The dense network of permanent stations is arranged regularly every 60 km. Each link in the Orphéon infrastructure has been designed to offer a high-precision RTK correction service available in all circumstances. Border areas are complemented by our partnership agreements within Europe.

Click on the interactive map of the Orphéon network

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

  • The careful choice of layout for each of our 195 reference stations creates a linear and regular geometric mesh. Territory coverage is uniform wherever you are. 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. 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.
  • null

    A regular and homogeneous layout

Constellations already operational today :

05/11/2017

For GALILEO,

There are currently between 4 and 5 functional satellites which are permanently available for your positioning and the FULL GNSS corrections of the network.

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The only Galileo corrections already available in France

Of course, the European system, which today has 16 satellites in orbit, will continue to develop and expand with the forthcoming launch of 4 new satellites, but their number already makes it possible to make a difference and to work in better conditions.

For BeiDou,

There are also between 1 and 4 satellites permanently available for your positioning and the FULL GNSS corrections of the network.

Multi-frequency L1/L2 and L5

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

For you, in the field 6 additional satellites,

Sur le terrain, vous pouvez donc compter en permanence sur une disponibilité constante d’au moins 6 satellites supplémentaires.

Le cumule de ces 2 constellations supplémentaires font aujourd’hui une réelle différence pour votre productivité.

Il n’est donc pas besoin d’attendre 2020 pour tirer le meilleur partie de vos équipements Full GNSS.

Profitez dès à présent des corrections FULL GNSS disponibles sur la totalité du territoire et aux Antilles françaises.

How to take advantage of the new Full GNSS services?

Already subscribed? Connect today to our real-time services from your GNSS-compatible mobile with your usual user connection parameters (username and password) and select one of our Full GNSS mount points stamped “FULL”.

Settings :

  • DNS: ntrip.reseau-orpheon.fr
  • Port: 8500
  • Mount point*: VRS_RTCM-MSM_FULL or i-Max_RTCM-MSM_FULL
* choice depending on your equipment
Contact our Technical Service who will bring you concrete help and guide you step by step.

As a reminder, in order to be able to position itself within a few centimeters, a GPS/GNSS rover must be able to:

  • perform noise-free phase measurements on at least 5 satellites well distributed in space,
  • and receive differential corrections on these same 5 satellites.
Adding 2 constellations of additional Galileo and BeiDou satellites to those of the GPS and Glonass constellation thus makes it possible to increase the possibility of receiving a sufficient number of signals and of better quality, especially in difficult places. Indeed, in an urban environment, the walls of buildings or trees create masks which limit the number of visible satellites but also create “echoes” (multipath) which disturb the calculation of the positioning of the equipment. The number of visible satellites has therefore always been an important issue for quality positioning.

How does it benefit you on a daily basis?

100% more satellites

The addition of the Galileo and BeiDou satellites to the GPS and GLONASS satellites significantly increases 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 permanently count on the constant availability of at least 6 additional satellites 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

The densest and most regular coverage area in France

A multi-constellation network

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

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

Learn more: : See the page : Work in difficult places Contact our Technical Service who will bring you concrete help and guide you step by step.
Since October 12, 2017, Geodata Diffusion offers real-time GNSS corrections compatible with GPS, GLONASS, Galileo and BeiDou constellations.

For the same price

GPS+Glonass subscriptions have become Full GNSS!

You now benefit, without a price increase, from an unlimited GPS + GLONASS + Galileo + BeiDou subscription in addition to our new online Post-Processing & RINEX Download services, whether your subscription is: Local, Departmental, Regional or National. With your Orpheon subscription, you therefore have access to:
  • An unlimited Full GNSS real-time centimetric correction service
  • An online RINEX Full GNSS Post-Processing service
  • An online service for downloading RINEX Full GNSS
  • A web platform providing access to your account, your subscriptions and the state of the Orphéon network
  • A Smartphone application offering the same functions as the Web platform

How to take advantage of the new Full GNSS services?

Connect today to our real-time services from your GNSS-compatible mobile with your usual user connection parameters (username and password) and select one of our Full GNSS mount points stamped “FULL”.

Settings :

  • DNS: ntrip.reseau-orpheon.fr
  • Port: 8500
  • Mount point*: VRS_RTCM-MSM_FULL or i-Max_RTCM-MSM_FULL
* choice depending on your equipment

30% Discount to upgrade your hourly Package to a subscription

You have subscribed to a real-time hourly package, benefit from a discount of up to 30% of the value of your current package for any subscription to an unlimited subscription and benefit from the RINEX Post-processing & Downloading web application in plus Full GNSS real-time corrections as described above. Depending on your specialty, contact your usual distributor without hesitation (Find your Orpheon distributor), he will know, better than anyone, how to answer you and support you in your projects.

From our Spider platform, it is possible to connect to your customer account with your identifiers to view for each of your connections:

  • detailed logs
  • Path
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The Orphéon network offers, thanks to its user interface, tools that facilitate your daily work or the development and integration of precision GPS chips in your projects. Check your connections in real time, consult logs or view your trajectories makes your work easier and saves time. but also post-process your work directly online.

Go straight to the point!

Depending on your work environment and the usual platform on which your GPS is connected. This dedicated platform offers all our customers various services that complete access to your real-time GNSS corrections. It also allows you to freely consult:

        • The status of the Orpheon GNSS network
        • Your personal information
        • The contracts you have entered into
        • Your connection history
        • The history of your e-Invoices*
        • The remaining credit on your hourly rate

History of your e-invoices:

*Available, if you are billed by Geodata Diffusion directly for your subscriptions or your packages and you have accepted the dematerialized billing method (for more details see the dedicated e-invoice page). Easily find the history of your invoices on your customer area : https://fr.nrtk.eu/SBC/ Log in to your space with your username and password. null null null null Retrouvez vos informations de connexion et connectez-vous à l’aide de votre identifiant et de votre mot de passe, sur l’une des plateformes suivantes :

nullWith your smartphone

To access this information wherever you are, connect by flashing the QR-code below corresponding to the dedicated platform on which your GPS is usually connected:

Leica Spider platform:

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This approach is part of a desire to improve the quality of our services and simplify our exchanges. We hope that this additional information will satisfy you.
The free Orpheon application gives you access from your smartphone to a large number of very practical and complementary features of your subscription or package. With a simple glance, check the status of your mobile and its connection, but also you can consult the status of the entire network in real time. You can also consult the information associated with all the contracts attached to your account and check, at any time, the consumption of your package or the time remaining. All the information you need directly on your phone:
  • Status of your Mobile
  • Real-time network status
  • Check your NTRIP connection
  • Your personal information
  • Your contracts
  • Contact us
  • Settings

From today, find the Orpheon application

For downloading the Orpheon application

Directly on the Apple Store or on Google Play:

Click on the image below to access more information about our Smartphone applications and its features.

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Flash the QR code with your Smartphone to access the download page of the Apple Store or Google Play. Once the application is downloaded, you can benefit from additional information which will follow you everywhere in the field.

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Using the Orpheon app

Simple Connection

null Using your username and password you can log in to the application.

The different menus

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Status of your mobile

null With a simple glance, check the status of your mobile and its connection, but also you can consult the status of the entire network.

Check your NTRIP connection

null Connection information directly accessible for the configuration of your mobile

Your personal information

null You can view the contact information associated with the account used. This information complies with our privacy policy.

Your contracts

null You can consult the information associated with all the contracts linked to your account. You can thus control the consumption of your plan or the remaining time.

Contact us

null You can message us directly

Configuration setting

null Application configuration settings on your smartphone
Since October 12, 2017, Geodata Diffusion offers real-time GNSS corrections compatible with GPS, GLONASS, Galileo and BeiDou constellations.

For the same price

GPS+Glonass subscriptions have become Full GNSS!

You now benefit, without a price increase, from an unlimited GPS + GLONASS + Galileo + BeiDou subscription in addition to our new online Post-Processing & RINEX Download services, whether your subscription is: Local, Departmental, Regional or National. With your Orpheon subscription, you therefore have access to:
  • An unlimited Full GNSS real-time centimetric correction service
  • An online RINEX Full GNSS Post-Processing service
  • An online service for downloading RINEX Full GNSS
  • A web platform providing access to your account, your subscriptions and the state of the Orphéon network
  • A Smartphone application offering the same functions as the Web platform

How to take advantage of the new Full GNSS services?

Connect today to our real-time services from your GNSS-compatible mobile with your usual user connection parameters (username and password) and select one of our Full GNSS mount points stamped “FULL”.

Settings :

  • DNS: ntrip.reseau-orpheon.fr
  • Port: 8500
  • Mount point*: VRS_RTCM-MSM_FULL or i-Max_RTCM-MSM_FULL
* choice depending on your equipment

30% Discount to upgrade your hourly Package to a subscription

You have subscribed to a real-time hourly package, benefit from a discount of up to 30% of the value of your current package for any subscription to an unlimited subscription and benefit from the RINEX Post-processing & Downloading web application in plus Full GNSS real-time corrections as described above. Depending on your specialty, contact your usual distributor without hesitation (Find your Orpheon distributor), he will know, better than anyone, how to answer you and support you in your projects.
In order to receive your positioning data via the GPRS network, your receiver must be equipped with an active SIM card. If you do not already have one, it will be essential to equip yourself with one. However, we wanted this point not to penalize your budget, and have therefore developed strong partnerships with the French mobile telephone operators Orange and SFR. Thus, we offer with all our subscriptions, the SIM card at an exceptional price.
Learn more : See page : Choice of SIM cards Discover the offers
We want to offer our customers subscriptions that are precisely tailored to their real needs. Thus, all our offers take into account both the geographical area and the duration you need. Your distributor will study your project and offer you the most suitable subscription (local, departmental, regional or national). And if your needs change later, it will never be too late to change your subscription accordingly.
Learn more : Discover the offers New: Géodata Diffusion now offers you a new Local work area* suitable for long-term construction sites or sedentary users . More information ….
As a reminder, in order to be able to position itself within a few centimeters, a GPS/GNSS rover must be able to:
  • perform noise-free phase measurements on at least 5 satellites well distributed in space,
  • and receive differential corrections on these same 5 satellites.
Adding the constellation of Glonass satellites to those of the GPS constellation thus increases the possibility of receiving a sufficient number of signals of better quality. Thus, the productivity gains linked to the use of the constellation of GLONASS satellites can be estimated at +20 to +30% in semi-urban areas or near trees. Learn more:
See the page : Work in difficult places Contact our Technical Service who will bring you concrete help and guide you step by step.

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