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Des coordonnées et une heure dignes de confiance pour tout un pays.

Chaque levé, carte, cadastre, chantier et réseau horodaté d’un pays repose sur le référentiel géodésique national et l’heure nationale. Les stations de référence doivent rester stables pendant des décennies, fonctionner en continu et se rattacher au référentiel mondial. Le réseau est construit et exploité dans ce but.

Industrie

Gouvernement

Mesures

5

Sources citées

4

1. Administration publique · Référence géodésique et temps national

   Every map starts from here

   Surveys, maps, cadastres, construction, farming guidance and timed networks all rely on the national reference frame and national time. Reference stations define that frame and must stay stable and continuous for decades. Countries are asked to sustain the global frame, and a national network built for it serves every user.

2. Ce qui est mesuré

   Signals, weather and time

   Geodetic receivers on stable monuments track every satellite signal each second. A meteorological sensor beside each antenna supports atmospheric delay modelling, and timing receivers compare national time with satellite time. Every antenna, receiver and height is recorded in the station log.

   Instruments

   Geodetic receivers · Timing receivers · Station meteorology

3. Le nœud de base

   Clocks held at the station

   The node streams observations, writes daily archive files and watches signal quality for interference. When satellite time is lost, it holds time from its reference and reports how far it may have drifted, so networks that depend on it know what to trust.

4. Radio et liaisons

   Two paths for every stream

   Stations at agency buildings and towers stream over fibre to the positioning service. Cellular is a second, independent path, so corrections continue when the fibre is cut. Daily files and logs reach international services, and time reaches operators through the national time service.

   Liaisons

   Fibre · Réseau mobile public

5. Comment ça marche

   From a satellite signal to a survey

   A surveyor sets up on a building site. The nearest reference stations stream their observations, the positioning service computes corrections, and the surveyor’s receiver fixes its position in the national frame within seconds, consistent with every other survey in the country and with the global frame.

6. De la commande à l’exploitation · Commande

   Scope the frame and its users

   The scope reads the existing reference stations, the national frame and its tie to the global frame, the positioning services and their users, and the time service. Nexus Observatory Inc. returns a station plan, the processing and archive design, timing outputs and a price per station and per year.

   Planifier un déploiement

7. De la commande à l’exploitation · Relevé

   Survey for stability

   Crews and geodesists visit candidate sites for stable ground or buildings, a clear sky view, low multipath, no interference sources, power and two backhaul paths. Each candidate is tested with a temporary receiver before a monument is chosen. Findings shape the kit for each site before anything is built.

8. De la commande à l’exploitation · Autorisations

   Land and radio

   Agreements for long-term land or roof use are signed with owners, radio spectrum for any correction broadcasts is licensed, and building owners approve antenna masts. Every agreement is kept with the station record, because reference stations must stay put for decades.

9. De la commande à l’exploitation · Fabrication

   Build monuments and kits

   Monuments are designed for the ground at each site; receivers, antennas, meteorological sensors and nodes are tested together, enrolled with their identities and logged with serial numbers so every later change can be recorded in the station log. Nothing ships until the whole kit has passed its tests together.

   Ouvrir le configurateur de stations

10. De la commande à l’exploitation · Installation

    Install the monument and antenna

    Crews build the monument, mount the antenna with its orientation and height measured, install the receiver, meteorological sensor and node in the shelter, and connect both backhaul paths. Every measurement goes into the station log in the international format. Crews follow the site safety plan throughout the work.

11. De la commande à l’exploitation · Mise en service

    Commission against the frame

    Chaque nœud prouve son identité. Weeks of observations are processed to fix the station’s coordinates in the national and global frames, streams are tested with the positioning service, and the timing output is compared with the national time reference. Acceptance is recorded with the owner before handover.

12. De la commande à l’exploitation · Exploitation

    Hold the frame

    The agency sees every station streaming, daily solutions, signal quality and interference events. Surveyors and builders receive real-time corrections, networks receive time, and the frame is updated as the global frame is, with every station’s motion known. Every alert and action is kept on the record.

13. De la commande à l’exploitation · Maintenance

    Log every change

    Receivers and antennas are changed only with a log entry and overlapping observations, monuments are inspected, software updates roll out in rings, and interference is reported to the spectrum regulator. The station logs keep the time series usable for decades.

    Réserver des services sur le terrain

14. Produits de données

    For surveyors, geodesists and networks

    Surveyors, builders and farmers receive real-time corrections; geodesists and mapping agencies receive coordinates and velocities; researchers and international services receive daily archives; network operators receive time traceable to UTC; spectrum regulators receive interference reports, each tied to its station and time.

    Voir les produits de données

15. Preuves

    A frame that lasts decades

    Stations follow the international site guidelines, coordinates are computed in frames defined by the international conventions, the network supports the UN resolution on the global geodetic reference frame and time is traceable to UTC. Every change is logged, so the series stays usable for decades.

    Référentiels

    IGS Site Guidelines · IERS Conventions (IERS Technical Note 36) · UN General Assembly resolution 69/266 · ITU-R TF.460

16. Ce que vous obtenez

    Intégrité de la synchronisation et du positionnement

    Des horloges maîtresses PTP avec maintien de l’heure GNSS, détection de brouillage et surveillance de la synchronisation pour les réseaux et les instruments. Fourni sous forme de matériel + logiciel et service géré, pour carriers, utilities, financial infrastructure, observatories. Scale: National timing fabrics. Service levels are written as numbers you can measure on your own dashboard.

    Parler aux ventes

17. Étape suivante

    Planifier avec nous : référence géodésique et temps national

    Tell us the site, the measurements and the rules it answers to. We reply with a survey proposal, a design and a scope for geodetic reference and national timing. An engineer replies with a survey proposal and a scope, and the plan grows from one site to the network you need, at your pace.

    Planifier un déploiementOuvrir le configurateur de stationsOuvrir le Studio

01Le lieu et ses dangers

Où il fonctionne, et ce qui peut mal tourner.

Operating contextNational mapping and geodetic agencies run continuously operating reference stations that define the national frame, support positioning services and tie the country to the global geodetic reference frame. Countries are asked to sustain that frame, stations follow international site guidelines, and national time services hold their clocks to Coordinated Universal Time.

Dangers

• Monuments that move with the ground they stand on
• Receivers and antennas changed without records, breaking time series
• Interference and jamming of satellite signals
• Outages that interrupt positioning services
• Clocks that drift when satellite time is lost

02Ce qu’il faut mesurer

Quoi, où, à quelle fréquence, et selon quelles règles.

Chaque mesure indique où elle est prise, à quelle fréquence, et la norme ou la réglementation publique qui la fonde. Les numéros de la colonne des sources ouvrent la source citée plus bas.

03La pile d’observation

D’un module de base à un réseau.

Les mêmes briques à chaque échelle : des instruments et un nœud de base, un site avec sa radio, une flotte exploitée comme un tout, et un réseau fédéré sur le protocole ouvert.

1. 01

   Unité de base

   A reference station: a geodetic receiver and antenna on a stable monument, a meteorological sensor and a node.

   Build a station →
2. 02

   Site

   A site: the monument, the receiver in a shelter, power with backup and two independent backhaul links.

   Plan a site →
3. 03

   Parc

   The national reference network processed as one frame, with one register of every antenna and receiver change.

   Managed offers →
4. 04

   Réseau

   National frames tie to the global reference frame, and time references to UTC, through open international services.

   The open protocol →

• 01Station géodésique GNSS
• 02Station de référence GNSS (RTK)
• 03Station météorologique automatique (classe OMM)
• 04Passerelle de capteurs et d’instruments
• 05Nœud de périphérie (Wedge)
• 06Terminal fibre
• 07Modem/routeur cellulaire
• 08Abri

Radio et liaisons

Fibre

Stations at agency buildings and towers use fibre for real-time streams to positioning services.

Radio et liaisons

Réseau mobile public

Cellular is the second path, so streams continue when the fibre is cut.

Edge computeThe node streams observations to the positioning service, writes the daily archive files, watches signal quality and interference, and holds time from the reference when satellite time is lost.

PowerMains with a battery that rides through outages so the time series has no gaps; remote stations run on solar with enough storage for the darkest weeks.

04Comment ça marche

De l’instrument au produit.

Le parcours d’une observation, niveau par niveau, avec l’interface de chaque liaison et une nomenclature en dessous ; puis comment ce nœud devient un site, une flotte et des réseaux fédérés.

05De la commande à l’exploitation

Chaque étape, du premier appel à un site en service.

La même équipe et le même dossier portent le travail, du cadrage à la maintenance.

1. 01 Order

   Scope the frame and its users

   The scope reads the existing reference stations, the national frame and its tie to the global frame, the positioning services and their users, and the time service. Nexus Observatory Inc. returns a station plan, the processing and archive design, timing outputs and a price per station and per year. 3

2. 02 Survey

   Survey for stability

   Crews and geodesists visit candidate sites for stable ground or buildings, a clear sky view, low multipath, no interference sources, power and two backhaul paths. Each candidate is tested with a temporary receiver before a monument is chosen. Findings shape the kit for each site before anything is built. 1

3. 03 Permits

   Land and radio

   Agreements for long-term land or roof use are signed with owners, radio spectrum for any correction broadcasts is licensed, and building owners approve antenna masts. Every agreement is kept with the station record, because reference stations must stay put for decades.

4. 04 Build

   Build monuments and kits

   Monuments are designed for the ground at each site; receivers, antennas, meteorological sensors and nodes are tested together, enrolled with their identities and logged with serial numbers so every later change can be recorded in the station log. Nothing ships until the whole kit has passed its tests together.

5. 05 Install

   Install the monument and antenna

   Crews build the monument, mount the antenna with its orientation and height measured, install the receiver, meteorological sensor and node in the shelter, and connect both backhaul paths. Every measurement goes into the station log in the international format. Crews follow the site safety plan throughout the work. 1

6. 06 Commission

   Commission against the frame

   Chaque nœud prouve son identité. Weeks of observations are processed to fix the station’s coordinates in the national and global frames, streams are tested with the positioning service, and the timing output is compared with the national time reference. Acceptance is recorded with the owner before handover. 24

7. 07 Operate

   Hold the frame

   The agency sees every station streaming, daily solutions, signal quality and interference events. Surveyors and builders receive real-time corrections, networks receive time, and the frame is updated as the global frame is, with every station’s motion known. Every alert and action is kept on the record. 3

8. 08 Maintain

   Log every change

   Receivers and antennas are changed only with a log entry and overlapping observations, monuments are inspected, software updates roll out in rings, and interference is reported to the spectrum regulator. The station logs keep the time series usable for decades. 1

06Produits de données et intégration

Ce qu’il fournit, à qui, et dans quels systèmes.

Produits de données

• Real-time positioning correctionsSurveyors, builders and farmers
• Station coordinates and velocitiesGeodesists and mapping agencies
• Daily observation archivesResearchers and international services
• Time traceable to UTCNetwork operators and timing users
• Interference reportsSpectrum regulators

Intégration

• Positioning serviceStreams feed the agency’s own real-time correction service.
• International archivesDaily files and station logs are shared with international geodetic services in their formats.
• Timing usersTime outputs reach operators through the national time service.

Exchanged through RTCM, RINEX, NTP with NTS.

07Questions des acheteurs

Avant de cadrer votre projet.

Will the stations change our frame?

No. They are tied to the national frame and updated only when the agency decides.

Can receivers be replaced later?

Yes, with log entries and overlapping observations so the series stays continuous.

Do you detect jamming?

Each receiver reports signal quality and interference events.

À qui appartiennent les données ?

The agency. Sharing follows its own policy.

08Ressources

Les sources de cette page.

Normes, réglementations et lignes directrices publiques, citées là où elles s’appliquent. Chacune ne s’applique que dans sa juridiction ou son champ.

1. 1IGS Site GuidelinesInternational GNSS Service
2. 2IERS Conventions (IERS Technical Note 36)International Earth Rotation and Reference Systems Service
3. 3UN General Assembly resolution 69/266: A global geodetic reference frame for sustainable developmentUnited Nations · 2015
4. 4ITU-R TF.460: Standard-frequency and time-signal emissionsInternational Telecommunication Union

09Voir aussi

Cas d’usage et solutions.

10Administration publique : domaines spécialisés

Les autres domaines de cette industrie.

Présentez-nous le site.

Planifiez un déploiement, configurez une station, modélisez-la dans le Studio ou parlez à l’équipe commerciale. Le formulaire indique qui reçoit vos coordonnées.