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GNSS reference networks: monuments sending corrections to a rover in the field. The loop, step by step: 1. Three reference stations ring a survey area. 2. The chain from source to console stands ready. 3. Each station logs carrier phase every second. 4. Each reading is stamped with time and place. 5. Observations are signed at the station. 6. The network solves one correction model. 7. The relay forwards sealed packets untouched. 8. The edge verifies every signature first. 9. Atmospheric errors are separated from position. 10. Only a confirmed result leaves the edge. 11. A rover receives centimetre corrections. 12. The console shows the evidence with the alert. 13. The rover marks a stake to a centimetre. 14. Sensors check that the response worked. 15. Record, proof and action are archived together. 16. Everything settles back to idle.
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Three reference stations ring a survey area
Nexus Observatory/
Positioning, navigation and timing/
GNSS reference networksGNSS reference networks, inside Positioning, navigation and timing: multi-constellation, multi-frequency receivers, RTK networks and NTRIP, PPP and PPP-RTK, satellite-based augmentation (SBAS) and more. Every item is traced to its specification, from IS-GPS-200 (GPS interface specification) to Galileo Open Service SIS ICD, and runs on the open Observatory Protocol.
Plan with usArchitectureThe protocolAt a glance
Receivers using GPS, Galileo, GLONASS, BeiDou and regional systems on several frequencies for accuracy and robustness. In GNSS reference networks, part of Positioning, navigation and timing, the GNSS positioning and augmentation layer holds multi-constellation, multi-frequency receivers, drawn against IS-GPS-200 and Galileo Open Service SIS ICD and used beside geodetic reference frames on the same sites.
Inkinga
Positions drive autonomous trucks; timestamps order every event in a network. When a receiver is jammed or spoofed, both can be wrong while looking perfectly normal. Integrity has to be designed and measured, because a degraded signal rarely announces itself to the systems that depend on it.
Key facts
Components
Interfaces
Where it works
In the story below
Scenes · 13
Next steps
Plan a deploymentOpen the Field Deployment StudioSee Positioning, navigation and timingTalk to salesPositioning, navigation and timing · GNSS reference networks
Positions drive autonomous trucks; timestamps order every event in a network. When a receiver is jammed or spoofed, both can be wrong while looking perfectly normal. Integrity has to be designed and measured, because a degraded signal rarely announces itself to the systems that depend on it.
What it does
Receivers using GPS, Galileo, GLONASS, BeiDou and regional systems on several frequencies for accuracy and robustness. In GNSS reference networks, part of Positioning, navigation and timing, the GNSS positioning and augmentation layer holds multi-constellation, multi-frequency receivers, drawn against IS-GPS-200 and Galileo Open Service SIS ICD and used beside geodetic reference frames on the same sites.
GNSS positioning and augmentation
Local corrections and integrity for precision approach at airports. In GNSS reference networks, part of Positioning, navigation and timing, the GNSS positioning and augmentation layer holds ground-based augmentation, drawn against RTCA DO-253 and ICAO Annex 10. We build it into every site for GNSS reference networks against that standard, and keep its version and its test results on the site’s record.
GNSS positioning and augmentation
Precise point positioning from orbit and clock corrections, with or without regional atmosphere models. In GNSS reference networks, part of Positioning, navigation and timing, the GNSS positioning and augmentation layer holds PPP and PPP-RTK, drawn against RTCM 10403 and IGS products and used beside reference stations and GNSS data formats on the same sites.
GNSS positioning and augmentation
Wide-area corrections and integrity for aviation and other safety uses. In GNSS reference networks, part of Positioning, navigation and timing, the GNSS positioning and augmentation layer holds satellite-based augmentation, drawn against RTCA DO-229 and ICAO Annex 10 and used beside navigation message authentication on the same sites.
Time and place
Every record made for GNSS reference networks carries its time, from a clock disciplined by satellite time or a PTP grandmaster, with the position and siting record of the station that made it. When time or position degrades, the record for GNSS reference networks says so, and every user downstream sees the same warning.
GNSS positioning and augmentation
Real-time kinematic corrections from reference stations for centimetre positioning. In GNSS reference networks, part of Positioning, navigation and timing, the GNSS positioning and augmentation layer holds RTK networks and NTRIP, drawn against RTCM 10403 and RTCM 10410 and used beside assisted GNSS in cellular networks on the same sites.
Ukwethembeka
A node joins a network for GNSS reference networks only after its hardware root of trust answers an attestation challenge. Its keys stay in secure hardware, its software arrives signed and every record it makes for GNSS reference networks carries a signature, so anyone downstream can check where a value came from.
Ubufakazi
We trace each part of GNSS reference networks to its specification: IS-GPS-200, Galileo Open Service SIS ICD and BeiDou Open Service ICD. We keep the versions, configurations and test results of GNSS reference networks as signed records, so a buyer or an auditor can check what was delivered against what was specified.
Izibuyekezo
Software and configuration reach a fleet for GNSS reference networks in rings: one canary site first, then a few, then all, each ring gated on health and data completeness. A failed gate stops the wave, and each node for GNSS reference networks returns to its last good release without a site visit.
How it scales
A network for GNSS reference networks starts with one base node and the instruments it reads. A station adds power and radio, a site adds a relay and a fleet repeats the proven site, so capacity for GNSS reference networks grows by adding units, never by replacing what works.
What you get
PTP grandmasters with GNSS holdover, interference detection and timing monitoring for networks and instruments. For GNSS reference networks, it goes to carriers, utilities, financial infrastructure and observatories as hardware and software or a managed service, sized to the sites they run.
Talk to salesNext step
Tell us the sites, the systems GNSS reference networks must work with and the outcome you need, with a map or a list of addresses if you have one. An engineer replies with a survey proposal, a design and a scope for GNSS reference networks, and the plan grows from one site to the network you need.
Plan a deploymentOpen the Field Deployment StudioSee Positioning, navigation and timingMore presentations
Each opens as a full-screen presentation: deeper pages on the same subject, explainers, stories, guided tours of the places, network scenes and the observatories that came before.
All presentations01Yini
The shared foundations every network and sensor depends on: how spectrum is licensed, shared and monitored, GNSS positioning and its corrections, packet timing with PTP and SyncE, grandmasters and holdover, resilient PNT alternatives, and the detection of interference, jamming and spoofing. Each technology below carries what it is, what we do with it, and the standard it is drawn against.
Spectrum, timing and PNT
Receivers using GPS, Galileo, GLONASS, BeiDou and regional systems on several frequencies for accuracy and robustness.
We design, integrate and deploy.
IS-GPS-200 (GPS interface specification) · Galileo Open Service SIS ICD · BeiDou Open Service ICD
Spectrum, timing and PNT
Real-time kinematic corrections from reference stations for centimetre positioning.
We design, deploy, operate and maintain.
RTCM 10403 (differential GNSS services, version 3) · RTCM 10410 (NTRIP)
Spectrum, timing and PNT
Precise point positioning from orbit and clock corrections, with or without regional atmosphere models.
We design, integrate and operate.
RTCM 10403 (SSR messages) · IGS products · Galileo High Accuracy Service
Spectrum, timing and PNT
Wide-area corrections and integrity for aviation and other safety uses.
We integrate.
RTCA DO-229 (SBAS MOPS) · ICAO Annex 10
Spectrum, timing and PNT
Local corrections and integrity for precision approach at airports.
We integrate and support.
RTCA DO-253 · ICAO Annex 10
Spectrum, timing and PNT
The coordinate frames positions are expressed in, and the transformations between them.
We design and operate.
ITRF (IERS) · NAD83(CSRS) (Natural Resources Canada)
Spectrum, timing and PNT
Network-supplied assistance and hybrid GNSS-cellular positioning for devices.
We design and integrate.
3GPP TS 37.355 (LTE Positioning Protocol) · 3GPP TS 38.305
Spectrum, timing and PNT
Continuously operating reference stations with standard observation and navigation data exchange.
We design, deploy, operate and maintain.
RINEX (IGS and RTCM) · NMEA 0183
Spectrum, timing and PNT
Cryptographic authentication of broadcast navigation data to resist spoofing.
We integrate.
Galileo OSNMA SIS ICD
02Architecture
GNSS reference networks draws on the spectrum below; the highlighted layers carry this area, and the protocol functions it speaks are marked.
Spectrum regimes and access
9
Spectrum monitoring and interference management
8
GNSS positioning and augmentation
9
Packet timing: PTP, SyncE and NTP
10
Grandmasters, reference clocks and holdover
7
Resilient PNT
9
Interference, jamming and spoofing detection
7
01Joyina Identity, attestation quote, signed policy.
02Admit Admitted for a stated scope, nothing wider.
03Chaza What, where, how and by whom, with calibration.
04Time One clock across the grid, with its error bound.
05Observe Every value with quality and provenance.
06Qualify Tested against the specification, state on record.
07Federate Signed exchange across grids and trust domains.
08Orchestrate Software and configuration by signed plan.
09Correct A correction marks what depends on it and publishes a new version.
10Exchange Products reach people and applications through versioned interfaces.
11Prove Signed proof receipts that an independent verifier can check.
12Exit and decommission An open exit path, and a record that closes.
03On the grid
The open networks on the grid today, over real relief and the geodesic cells we count them into, filtered to the solid earth domain this area serves. A site built here enrols into the same grid.
04In the field
Deployment scenarios from the sector research that rely on GNSS reference networks.
Amadolobha05Open and enterprise
The open counterpart lives on the main site for anyone to read and run. The enterprise service is designed, deployed and operated with you, under contract.
Open, on the main site
Enterprise, on this site
06The rest of the line
Survey, design, deployment and operation for GNSS reference networks. The form names who receives your details.
Talk to usAsk for a quoteGNSS reference networks, inside Positioning, navigation and timing: multi-constellation, multi-frequency receivers, RTK networks and NTRIP, PPP and PPP-RTK, satellite-based augmentation (SBAS) and more. Every item is traced to its specification, from IS-GPS-200 (GPS interface specification) to Galileo Open Service SIS ICD, and runs on the open Observatory Protocol.
The open counterpart lives on the main site for anyone to read and run. The enterprise service is designed, deployed and operated with you, under contract.
