--- title: "Resilient PNT: Positioning and timing | Nexus Observatory" description: "Resilient PNT, inside Positioning, navigation and timing: resilient PNT frameworks, terrestrial radionavigation (eLoran-type), time over fibre…" url: https://observatory.global/pnt/resilient-pnt/ publisher: Nexus Observatory Inc. updated: 2026-11-07 --- [Nexus Observatory](https://observatory.global/) / [Positioning, navigation and timing](https://observatory.global/pnt/) / **Resilient PNT** # Several sources, cross-checked, one trusted solution. Resilient PNT, inside Positioning, navigation and timing: resilient PNT frameworks, terrestrial radionavigation (eLoran-type), time over fibre, terrestrial beacon systems and more. Every item is traced to its specification, from US Executive Order 13905 to DHS Resilient PNT Conformance Framework, and runs on the open Observatory Protocol. [Plan with us](https://observatory.global/contact/) Architecture [The protocol](https://observatory.global/protocol/specification/) **Technologies**: 9 **At the frontier**: 3 **Protocol functions**: 3 of 12 **Industries served**: 6 At a glance ## Resilient PNT frameworks Structured ways to assess and raise how well equipment resists, detects and recovers from PNT disruption. In resilient PNT, part of Positioning, navigation and timing, the resilient PNT layer holds resilient PNT frameworks, drawn against US Executive Order 13905 and DHS Resilient PNT Conformance Framework and used beside inertial and multi-sensor navigation on the same sites. The problem ### Several sources, cross-checked, one trusted solution 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 **Specification**: US Executive Order 13905 · DHS Resilient PNT Conformance Framework **Specification**: 3GPP TS 23.501 clause 5.27 (time synchronisation) · 3GPP TS 22.104 **Specification**: ITU-T G.8275.1 · IEEE 1588-2019 **Specification**: 3GPP TS 37.355 (TBS positioning) **Standards**: US Executive Order 13905 · DHS Resilient PNT Conformance Framework · ITU-T G.8275.1 · IEEE 1588-2019 Components - Geodetic GNSS station on a deep-drilled braced monument (generic class, no brand) - Robotic total station in a monitoring shelter - Slope stability radar on a trailer - Haul truck with onboard network and autonomy kit - Private LTE mast on a solar skid - "AI tower in a box" - PTP grandmaster clock with GNSS antenna - Data hall row pair with cold-aisle containment Interfaces **Time and position**: GNSS 1PPS Where it works - 5G as a timing source - Terrestrial beacon systems In the story below 1. The system, part by part 2. Assembly 3. Installation 4. Deployment 5. Connections 6. Operation 7. Failure and recovery 8. Scale and federation 9. What you get Scenes · 13 Next steps [Plan a deployment](https://observatory.global/pnt/contact/deployment/) [Open the Field Deployment Studio](https://observatory.global/studio/) [See Positioning, navigation and timing](https://observatory.global/pnt/) [Talk to sales](https://observatory.global/contact/sales-enquiry/) 1. Positioning, navigation and timing · Resilient PNT Several sources, cross-checked, one trusted solution 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. 2. What it does Resilient PNT frameworks Structured ways to assess and raise how well equipment resists, detects and recovers from PNT disruption. In resilient PNT, part of Positioning, navigation and timing, the resilient PNT layer holds resilient PNT frameworks, drawn against US Executive Order 13905 and DHS Resilient PNT Conformance Framework and used beside inertial and multi-sensor navigation on the same sites. SpecificationUS Executive Order 13905 · DHS Resilient PNT Conformance Framework 3. Resilient PNT 5G as a timing source Delivering accurate time to devices over 5G for industrial and utility uses. In resilient PNT, part of Positioning, navigation and timing, the resilient PNT layer holds 5G as a timing source, drawn against 3GPP TS 23.501 clause 5.27 and 3GPP TS 22.104. Specification3GPP TS 23.501 clause 5.27 (time synchronisation) · 3GPP TS 22.104 4. Resilient PNT Time over fibre Delivering time from a national or regional reference over terrestrial fibre as a GNSS-independent source. In resilient PNT, part of Positioning, navigation and timing, the resilient PNT layer holds time over fibre, drawn against ITU-T G.8275.1 and IEEE 1588-2019 and used beside optical clocks and quantum navigation sensors on the same sites. SpecificationITU-T G.8275.1 · IEEE 1588-2019 5. Resilient PNT Terrestrial beacon systems Ground transmitters giving indoor and urban positioning and timing. In resilient PNT, part of Positioning, navigation and timing, the resilient PNT layer holds terrestrial beacon systems, drawn against 3GPP TS 37.355 and used beside signals-of-opportunity navigation on the same sites. Specification3GPP TS 37.355 (TBS positioning) 6. Time and place When and where, on every record Every record made for resilient PNT 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 resilient PNT says so, and every user downstream sees the same warning. 7. Resilient PNT Terrestrial radionavigation High-power low-frequency signals that are hard to jam and provide time and position independent of GNSS. In resilient PNT, part of Positioning, navigation and timing, the resilient PNT layer holds terrestrial radionavigation, drawn against US Executive Order 13905 and DHS Resilient PNT Conformance Framework and used beside LEO PNT on the same sites. SpecificationUS Executive Order 13905 · DHS Resilient PNT Conformance Framework 8. Trust Proved before it is trusted A node joins a network for resilient PNT 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 resilient PNT carries a signature, so anyone downstream can check where a value came from. 9. Evidence Traced to its specifications We trace each part of resilient PNT to its specification: US Executive Order 13905, DHS Resilient PNT Conformance Framework and ITU-T G.8275.1. We keep the versions, configurations and test results of resilient PNT as signed records, so a buyer or an auditor can check what was delivered against what was specified. StandardsUS Executive Order 13905 · DHS Resilient PNT Conformance Framework · ITU-T G.8275.1 · IEEE 1588-2019 10. Failure and recovery When a node fails, the fleet knows first When a node for resilient PNT goes silent or a sensor drifts, the node buffers its data and fails over to a second link where the site has one. The alert carries the evidence a responder needs, and the record for resilient PNT loses nothing and counts nothing twice. 11. How it scales One base unit, repeated A network for resilient PNT 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 resilient PNT grows by adding units, never by replacing what works. 12. What you get Timing and positioning integrity PTP grandmasters with GNSS holdover, interference detection and timing monitoring for networks and instruments. For resilient PNT, 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 sales](https://observatory.global/contact/sales-enquiry/) 13. Next step Resilient PNT, planned with you Tell us the sites, the systems resilient PNT 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 resilient PNT, and the plan grows from one site to the network you need. [Plan a deployment](https://observatory.global/pnt/contact/deployment/) [Open the Field Deployment Studio](https://observatory.global/studio/) [See Positioning, navigation and timing](https://observatory.global/pnt/) More presentations ## See it from every side. 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 presentations](https://observatory.global/presentations/) ### In depth [Use case **Highway corridor coverage and safety sensing**](https://observatory.global/use-cases/highway-corridor/) [Use case **Wildfire camera and fire-weather node**](https://observatory.global/use-cases/wildfire-camera/) [Use case **Utility grid-edge private LTE and wildfire weather**](https://observatory.global/use-cases/utility-grid-edge/) [Use case **Avalanche detection site**](https://observatory.global/use-cases/avalanche-detection/) ### Explainers [Explainer · Environment and climate **Environment and climate — Sectors** Methane fencelines, acoustic biodiversity grids, flux towers, river sondes and smoke networks: an interactive explainer with the method behind every number.](https://observatory.global/industries/climate/explainer/) [Explainer · Communities and rural **Communities and rural** Community cellular coverage on real terrain, fixed-wireless Fresnel clearance, corridors, a remote microgrid sized from its load and interim public-safety broadband.](https://observatory.global/industries/communities/explainer/) [Platform **Positioning, navigation and timing** A wrong timestamp is a wrong answer](https://observatory.global/pnt/) [Platform **Connectivity** Public networks were not built for this site](https://observatory.global/connectivity/) ### Stories [Story · Timing and PNT **Time as infrastructure** A 5G cell must hold its phase within 3 µs of its neighbours, ±1.5 µs of a common reference; a synchrophasor’s one per cent vector error leaves room for only…](https://observatory.global/stories/timing-pnt/) [Story · 6G and sensing **Networks that sense** The framework for 6G names integrated sensing and communication as one of its usage scenarios: the same radio that carries data also measures range,…](https://observatory.global/stories/sensing-networks-6g/) [Story · Mountains and avalanche terrain **Snowpack, slope and signal** Avalanche forecasting reasons about the likelihood and size of avalanches on given terrain. The observations behind it come from a few stations in hard…](https://observatory.global/stories/mountain-avalanche/) ### Places and networks [Guided tour · Guided 3D tour **Arctic station** A self-powered station on the ice: a microgrid, a low-orbit satellite terminal, a weather station, a GNSS monument and an edge node that holds data through the polar night.](https://observatory.global/environments/arctic-station/) [Guided tour · Guided 3D tour **Orbit view** Ground tracks of a sun-synchronous imager and three shells of a broadband constellation, computed from their orbits over a rotating Earth.](https://observatory.global/environments/orbit-view/) [Guided tour · Guided 3D tour **Mountain valley site** A private 5G tower, an automatic weather station, a compact radar and a seismic vault on real alpine terrain, joined to an edge data centre that admits, times and publishes every…](https://observatory.global/environments/mountain-valley/) [Network scene · Private 5G · Port **Private 5G at a container port** Small cells on the yard lighting masts and a sector site on the operations building serve remote-controlled cranes and trucks among steel container stacks.](https://observatory.global/environments/networks/private5g-port/) [Network scene · NTN · Satellite **Satellite direct to device in a mountain valley** Where the valley cell cannot reach, phones on the pass road connect straight to a low-orbit satellite, which relays through its feeder link to a gateway.](https://observatory.global/environments/networks/ntn-d2d/) ### Heritage observatories [Heritage observatory · United States · 1885 **Blue Hill Meteorological Observatory** Abbott Lawrence Rotch built a weather observatory on a hill south of Boston at his own expense and began observations on 1 February 1885.](https://observatory.global/observatories/blue-hill-observatory/) [Heritage observatory · World ocean · 1999 **Argo profiling float array** About four thousand small robots drift through the oceans, sinking to 2,000 metres every ten days and rising to report temperature and salinity by satellite.](https://observatory.global/observatories/argo-float-array/) ### Interactive tools [Interactive tool · Plan a site **Field Deployment Studio** Terrain, devices, coverage, viewshed, power and the best spot for a station, then a deployment request with the plan attached.](https://observatory.global/studio/) **01** What it is ## Resilient PNT. 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 ### Resilient PNT frameworks Structured ways to assess and raise how well equipment resists, detects and recovers from PNT disruption. We design and support. US Executive Order 13905 · DHS Resilient PNT Conformance Framework Spectrum, timing and PNT ### Terrestrial radionavigation (eLoran-type) High-power low-frequency signals that are hard to jam and provide time and position independent of GNSS. We design and integrate. US Executive Order 13905 · DHS Resilient PNT Conformance Framework Spectrum, timing and PNT ### Time over fibre Delivering time from a national or regional reference over terrestrial fibre as a GNSS-independent source. We design, integrate and operate. ITU-T G.8275.1 · IEEE 1588-2019 Spectrum, timing and PNT ### Terrestrial beacon systems Ground transmitters giving indoor and urban positioning and timing. We design and integrate. 3GPP TS 37.355 (TBS positioning) Spectrum, timing and PNT ### 5G as a timing source Delivering accurate time to devices over 5G for industrial and utility uses. We design and integrate. 3GPP TS 23.501 clause 5.27 (time synchronisation) · 3GPP TS 22.104 Spectrum, timing and PNT ### Inertial and multi-sensor navigation IMUs fused with odometry, vision and barometry to bridge GNSS outages. We design and integrate. DHS Resilient PNT Conformance Framework **Frontier** · Spectrum, timing and PNT ### LEO PNT Navigation and timing from low-orbit constellations with stronger signals and faster geometry change than GNSS. We design and integrate. ITU RR Art. 5 (radionavigation-satellite service) · US Executive Order 13905 **Frontier** · Spectrum, timing and PNT ### Optical clocks and quantum navigation sensors Clocks and cold-atom inertial sensors that could hold time and position far longer without external signals. We design and support. BIPM CCTF roadmap towards the redefinition of the second **Frontier** · Spectrum, timing and PNT ### Signals-of-opportunity navigation Positioning from existing cellular, broadcast and satellite signals not built for navigation. We design. 3GPP TS 38.305 **02** Architecture ## Where it sits, and what it speaks. Resilient PNT 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 01**Join** Identity, attestation quote, signed policy. 02**Admit** Admitted for a stated scope, nothing wider. 03**Describe** What, where, how and by whom, with calibration. 04**Time** One clock across the grid, with its error bound. 05**Observe** Every value with quality and provenance. 06**Qualify** Tested against the specification, state on record. 07**Federate** Signed exchange across grids and trust domains. 08**Orchestrate** Software and configuration by signed plan. 09**Correct** A correction marks what depends on it and publishes a new version. 10**Exchange** Products reach people and applications through versioned interfaces. 11**Prove** Signed proof receipts that an independent verifier can check. 12**Exit and decommission** An open exit path, and a record that closes. **03** On the grid ## Every site joins one observing 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. ## The observing grid 1. Open solid earth instruments on the observing grid. **04** In the field ## Where this runs, sector by sector. Deployment scenarios from the sector research that rely on resilient PNT. [Transport Maritime and port met-ocean with vessel tracking Wave buoys and a receiver for vessel position broadcasts.](https://observatory.global/sectors/transport/) **05** Open and enterprise ## Open by default. Enterprise by contract. 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 - Timing budget method - Reference station metadata rules Enterprise, on this site - Timing and positioning integrity - Reference network design and operation - Holdover engineering **06** The rest of the line ## Positioning, navigation and timing, area by area. [Positioning, navigation and timing GNSS reference networks Continuously operating stations, tied to the geodetic frame.](https://observatory.global/pnt/gnss-reference-networks/) [Positioning, navigation and timing Time distribution PTP, SyncE and NTP, engineered to the budget.](https://observatory.global/pnt/time-distribution/) [Positioning, navigation and timing Grandmasters and holdover Reference clocks that keep time when the sky goes dark.](https://observatory.global/pnt/grandmasters-and-holdover/) [Positioning, navigation and timing Interference detection Jamming and spoofing found, located and logged.](https://observatory.global/pnt/interference-detection/) ## Bring us the site. Survey, design, deployment and operation for resilient PNT. The form names who receives your details. [Talk to us](https://observatory.global/contact/) [Ask for a quote](https://observatory.global/contact/sales-enquiry/) [Nexus Observatory](https://observatory.global/) **Positioning, navigation and timing** . Where and when, with the error bound. 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