Definition
GNSS, or Global Navigation Satellite System, is the general term for the satellite networks that provide positioning and timing anywhere on Earth. It covers all such systems, including the well-known GPS, as well as Galileo, GLONASS, and BeiDou.
A GNSS receiver listens to signals from these satellites to work out its exact location. Because it draws on multiple systems, GNSS can offer more reliable and accurate positioning than any single network alone.
In simple terms, GNSS is the worldwide satellite positioning capability that tells devices precisely where they are.
How It Works
GNSS satellites continuously broadcast signals that include the time they were sent. A receiver measures how long each signal took to arrive from several satellites and uses those travel times to calculate its distance from each one, then combines them to pinpoint its position.
Standard positioning is accurate to a few metres, but correction techniques such as RTK and PPK compare signals with a reference to remove errors and reach centimetre-level accuracy. This precision is what makes GNSS valuable for surveying and mapping.
Applications
GNSS is used in surveying, navigation, mapping, agriculture, and construction. Surveyors rely on it to establish control points and measure positions, drone operators to georeference imagery, and countless devices to navigate. It is the backbone of modern positioning.
Benefits
- Global, all-weather positioning.
- Higher reliability by using multiple systems.
- Centimetre accuracy with RTK or PPK.
- Essential for georeferencing captured data.
- Widely supported across devices and industries.
Related Terms
- GPS Coordinates
- RTK (Real-Time Kinematic)
- PPK (Post-Processed Kinematic)
- Georeference
Frequently Asked Questions
What is the difference between GNSS and GPS?
GPS is one specific satellite system operated by the United States, while GNSS is the umbrella term covering all such systems, including GPS.
How accurate is GNSS?
Standard GNSS is accurate to a few metres, but correction methods such as RTK can achieve centimetre-level accuracy.
What systems make up GNSS?
GNSS includes GPS, Galileo, GLONASS, and BeiDou, among others.
Why is GNSS important in surveying?
It provides precise, real-world positioning used to establish control points and georeference survey and mapping data.
About Track3D
Track3D helps teams turn precise GNSS-referenced data into accurate digital twins. Learn more at Track3D.
