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.
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.
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.
SITE / 01Reference stationsContinuous GNSS observations
CONTROL / 02Network operationsMetadata and quality monitoring
PROCESS / 03Data servicesFiles, models, or corrections
FIELD / 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 / 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.