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EINSICHT · POSITIONIERUNGSTECHNOLOGIE

GNSS-RTK – wie präzise Satellitenpositionierung funktioniert.

Standard GNSS gives you several-metre accuracy outdoors. GNSS-RTK gives you centimetres.

It's the technology that makes autonomous tractors plough straight lines, that lets surveyors stake out buildings without an optical instrument, and that's increasingly built into industrial telematics. This is the operator-level explainer of how RTK works and where it fits.

BASEknown posROVERcm fixRTCM corrections1–3 cm real-time

Die 30-Sekunden-Definition

GNSS (Global Navigation Satellite Systems — GPS, GLONASS, Galileo, BeiDou) at the consumer level delivers position accuracy of 3–5 metres. RTK (Real-Time Kinematic) is a technique that lifts that to 1–3 cm in real time.

It works by having a stationary base station with a precisely-known position calculate the errors in the satellite signals it receives at that moment, and broadcasting those error corrections to nearby rover receivers.

Each rover applies the same corrections to its own signals, cancelling out atmospheric and orbital errors. Distance from base to rover matters — typically 10–30 km for full RTK accuracy.

Wie RTK tatsächlich funktioniert

The base station observes all visible satellites and computes the carrier-phase errors (not just code-based pseudoranges). It transmits these corrections in RTCM format via radio link, cellular, or NTRIP (Network Transport of RTCM via Internet Protocol).

The rover GNSS receiver decodes the corrections and applies them to its own raw GNSS observations, resolving phase ambiguities to produce fix-quality solutions.

Modern multi-band RTK receivers (using L1+L2 or L1+L5) achieve cm-level accuracy in seconds; older single-band receivers needed minutes.

Two operational variants: local base station (you operate your own, accurate to 10–30 km radius) and network RTK (commercial corrections from a network of base stations, accuracy across regions or globally).

Netzwerk RTK und PPP-RTK

Two delivery models matter for enterprise. Network RTK (NTRIP): commercial services like Trimble VRS Now, Hexagon SmartNet, Topcon TopNet — you subscribe and your rover gets corrections from the nearest virtual base station via cellular. Accuracy 1–3 cm across covered regions.

PPP-RTK (Precise Point Positioning with RTK convergence): satellite-broadcast corrections (Trimble RTX, NTRIP-via-satellite) deliver cm-accurate position without a cellular link.

Slower initial convergence (minutes vs seconds) but global coverage and no cellular requirement. Used heavily in agriculture, marine, and remote-area operations.

Wo RTK die richtige Antwort ist

Five categories are mature. Precision agriculture: autonomous tractors and planters drive cm-accurate lines using RTK; saved fuel, seed and time at scale.

John Deere, AGCO, Trimble Ag all use RTK. Construction and surveying: machine control (graders, dozers, excavators), site layout, as-built mapping.

Autonomous vehicles and robotics: RTK provides the absolute-position anchor that fuses with LiDAR / camera SLAM for safe autonomous operation.

Vehicle telematics for precision applications: ride-sharing, last-mile delivery, mining haul trucks. Surveying drones: RTK-equipped UAVs produce sub-centimetre photogrammetric maps.

Ehrliche Einschränkungen

Four constraints are real. Abdeckung: works only outdoors with sky-view; building canyons, indoor spaces, tunnels degrade quickly. Initialisation time: phase ambiguity resolution takes seconds (network RTK) to minutes (PPP-RTK convergence) from cold start.

Correction latency: cellular network RTK depends on cellular coverage; weak cellular means RTK fix drops.

Hardware cost: multi-band RTK receivers (u-blox ZED-F9, Trimble BD992) are more expensive than single-band consumer GNSS; subscriptions to network RTK services add operational cost.

Anbieter- und Ökosystemlandschaft

Silicon and modules: u-blox ZED-F9 series leads commercial-grade RTK at attractive price points; Trimble BD992 / BD992-INS for survey-grade with inertial integration; Septentrio AsteRx for high-end industrial.

Correction services: Trimble VRS Now, Trimble RTX (PPP-satellite), Hexagon SmartNet, Topcon TopNet, several regional and national networks.

Open services: many European countries operate public network-RTK services for surveying. Integration: vertical-software vendors (Trimble Ag, John Deere Operations Center, AutoCAD Civil 3D) embed RTK into workflow tools.

Wo TRACIO GNSS-RTK empfiehlt

Use cases requiring cm-level outdoor position in real time: autonomous outdoor vehicles and robotics; precision agriculture; construction machine control; survey-grade mobile mapping; tactical training on outdoor ranges; high-accuracy vehicle telematics for premium logistics.

We don't recommend GNSS-RTK for indoor or building-canyon use cases (UWB or visual SLAM fit), for consumer-grade tracking where 3–5 m is sufficient (standard GNSS), or for very high-volume cost-sensitive deployments where standard GNSS chip cost matters.

FAQ

Häufig gestellte Fragen

Wie unterscheidet sich RTK von Standard-GPS / GNSS?

Standard GNSS uses code-based positioning, accurate to 3–5 m. RTK uses carrier-phase measurements and base-station corrections to achieve 1–3 cm. Same satellites; different receiver and correction pipeline.

Brauchen wir eine eigene RTK-Basisstation oder können wir einen Service nutzen?

Kommt auf den Betrieb an. Permanente lokale Basisstation für einen einzelnen Standort (Bauernhof, Baustelle, Hafen). Netzwerk-RTK-Abonnement für mobile Operationen in verschiedenen Regionen.

PPP-RTK-Satellitenkorrekturen, bei denen die Mobilfunkabdeckung unzuverlässig ist. Wir modellieren die richtige Architektur in Stufe 1.

Funktioniert RTK in Gebäuden oder Tunneln?

Nein – RTK braucht eine Satelliten-Himmelsansicht. Für Innen- oder GPS-entschlossene Umgebungen sind UWB, visuelle SLAM oder Trägheitsnavigation die Alternativen. Hybride Stacks kombinieren RTK im Freien mit Innenpositionierung.

Wie viel erhöht RTK die Kosten für eine Tracking-Lösung?

Hardware: Das Multiband-RTK-Modul kostet 100–500 US-Dollar gegenüber 5–20 US-Dollar für den Verbraucher-GNSS.

Netzwerk-RTK-Abonnement: typischerweise 500–2.000 US-Dollar pro Jahr für kommerzielle Dienste. Für cm-genaue Anwendungen lohnt sich die Kosten; Für Standard-Flottentelematik lohnt es sich nicht.

RTK vs. PPP-RTK für unseren autonomen Fahrzeugeinsatz?

Netzwerk-RTK, wenn du zuverlässige Mobilfunkverbindungen hast und die schnellste Konvergenz (Sekunden) möchtest.

PPP-RTK, wenn du globale Abdeckung oder unzuverlässige Mobilfunknetze brauchst (die anfängliche Konvergenz dauert Minuten). Viele autonome Plattformen nutzen beide mit automatischem Rückfall.

Hilft RTK überhaupt drinnen?

Nicht direkt. Aber Hybridsysteme nutzen RTK draußen und übergeben nahtlos an UWB oder visuelle SLAM drinnen. Die Übergangshandhabung ist nicht trivial – wir entwerfen sie sorgfältig in Phase 1.

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