Real-time corrections
Stations can contribute observations to single-base or network correction services.
PERMANENT GNSS REFERENCE INFRASTRUCTURE
CORS
Continuously Operating Reference Stations are permanently installed GNSS receivers whose observations, station metadata, and established coordinates support precise positioning and reference-frame access.
4CHAPTERS4VISUAL BLOCKS1GRAPH LINKS2SOURCES
POSITION / SELECTED CONCEPTContinuously Operating Reference StationsStart with the role, then move through the editorial sequence.
HOW TO READ THIS PAGE
Visual explanationA diagram or operating scene makes the relationship visible.
Structured modelA flow, comparison, capability set, or boundary map organizes the idea.
Guided explanationOriginal prose connects the concept to its operating context.
01 / Overview
A stable receiver
becomes shared infrastructure.
A CORS is installed at a stable, surveyed location and operates continuously. Networks combine station observations and metadata so users can improve GNSS positioning or connect their work to a defined reference frame.
NOAA's National CORS Network is one national example. It combines stations owned by government, academic, and private organizations and distributes GNSS carrier-phase and code-range measurements with station metadata.
02 / Network
Stations are the edge,
services are the system.
OBSERVEReference stationsStable sites, monument and antenna, receiver, observations, clocks, coordinates, metadata, and maintenance
ASSURENetwork operationsStation health, communications, metadata, quality control, incidents, changes, and stewardship
REFERENCECoordinates and framePublished position, frame, epoch, transformations, change history, and authoritative scope
DELIVERData or correction serviceFiles, streams, models, formats, access, latency, coverage, support, and availability evidence
USEField receiver workflowExact method, equipment, configuration, delivery path, position, operation, uncertainty, and verification- 01Reference stations↔Network operationsobservations and health
- 02Coordinates and frame↔Network operationscoordinate authority and change context
- 03Network operations→Data or correction servicequality-controlled inputs
- 04Coordinates and frame→Data or correction servicereference meaning
- 05Data or correction service→Field receiver workflowbounded product and delivery
- 06Field receiver workflow←Network operationssupport evidence and anomalies
A station alone is not the complete user service. Operations, communications, quality control, coordinate maintenance, data centers, processing, and delivery mechanisms determine what the network can support.
01SITE / 01Reference stationsContinuous GNSS observations
02CONTROL / 02Network operationsMetadata and quality monitoring
03PROCESS / 03Data servicesFiles, models, or corrections
04FIELD / 04User receiverPosition in a reference frame
03 / Uses
One network,
several precise-positioning roles.
Post-processing
Archived observations can improve positions after field collection.
Reference-frame access
Published station coordinates help align user work with national or global spatial reference systems.
Scientific monitoring
Long-running stations also support geodesy, meteorology, space weather, and geophysical research.
04 / Boundaries
A station map is not
a service guarantee.
CORS networks are not globally uniform.Ownership, density, data access, correction formats, latency, coordinates, and commercial terms vary by region and operator.
Distance and geometry still matter.The usefulness of a station or network depends on the positioning method and spatial relationship to the user.
Reference frames must be explicit.Coordinates from different frames, epochs, or transformations can produce systematic shifts even when observations are precise.
05 / Connections
See the system around this concept.
Follow incoming and outgoing relationship records to understand what supplies, informs, enables, coordinates with, or extends this technology in the published knowledge graph.
Relationship radar / published edges1 records / 1 neighboring systems
Incoming00records point toward this concept
position roleContinuously Operating Reference StationsSelected technology
Outgoing01records point from this concept
01connections visible
position / PositioningReal-Time Kinematic ↗supplies reference corrections to
Reference-station infrastructure is one source of the correction information used in RTK positioning workflows.
3CONNECTED ROUTES3–3STEP POSITIONS20ROUTE SOURCE LINKS
Technology system
From positioning to guidance
Build a clean mental model of satellite positioning, correction infrastructure, precision methods, and the guidance system that uses them.
CURRENT POSITION03
03 / INFRASTRUCTURE
Open the complete route ↗Meet CORS
Learn where continuously operating reference stations fit within correction delivery and geodetic infrastructure.
06 / Evidence
Primary sources.
This briefing uses NOAA/NGS as an authoritative national CORS example and IGS as a global precise-products infrastructure example. Coverage and service behavior must be checked with the relevant regional operator.