Galileo System Sets 2027 Target for 20 cm Accuracy
The EU's satellite system is updating its technical framework to support higher precision and data authentication for users.
Updated on Oct. 21, 2026 in Space
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The European Union Agency for the Space Programme has released an updated information note detailing the upcoming expansion of its High Accuracy Service. The new documentation outlines the framework for a Full Service declaration expected in 2027.
Why it matters
This expansion aims to provide higher positioning precision for the 4 billion global users who currently rely on the Galileo satellite system. The updates reflect operational lessons gathered since the program's Initial Service launch, signaling a transition toward more reliable data authentication.
The Full Service aims to achieve 20 cm target horizontal positioning accuracy. Galileo will facilitate this by transmitting additional phase bias data and ionospheric corrections to receivers.
The players
European Union Agency for the Space Programme
The administrative body responsible for the management, operation, and service development of the European Union's satellite navigation infrastructure.
Galileo
A global satellite navigation and timing system owned by the European Union, currently serving 4 billion users worldwide.
The details
The system expansion introduces two distinct tiers, Service Level 1 and Service Level 2, designed to meet specific performance benchmarks. By transmitting phase biases—adjustments made to account for signal delays caused by satellite clock errors—and ionospheric corrections to adjust for signal distortion through the upper atmosphere, the system will offer significantly higher precision. These data streams will be authenticated to ensure the integrity of the navigation and timing information provided to end-users.
Timeline
2027: Planned declaration of the Galileo HAS Full Service.
The Tech Race
This roadmap moves Galileo from its initial validation stages toward a full-service operational benchmark. It sets a clear 2027 target to compete with other high-accuracy global navigation standards by integrating enhanced authentication and correction data.
Users will gain access to higher 20 cm horizontal positioning precision once the 2027 Full Service is fully operational. Future updates on specific receiver compatibility and integration requirements will be released via the official Galileo Service Centre portal.
The takeaway
The transition to the Full Service represents a significant scaling of precision for the 4 billion users of the Galileo network. Developers and users should monitor the Galileo Service Centre website for forthcoming documentation on authentication standards and hardware implementation requirements.
Further reading
For broader trends in satellite navigation, visit the Space section.
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