Meridian

Independent GNSS Monitoring and Alerting

Monitor the satellite signals your equipment relies on. Meridian gives operators independent visibility into disruption affecting Global Navigation Satellite Systems (GNSS), including GPS and Galileo, with alerts and evidence to support investigation.

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Why Meridian

Meridian gives organisations independent visibility into GNSS integrity. It detects interference, anomalies, and misleading information without changing user systems or interfering with operations.

What is checked

Radio-frequency (RF) spectrum observations help identify interference. Position and time plausibility checks look for unexpected receiver behaviour, while navigation-data verification checks the information broadcast by satellites. Together these checks provide more context than a receiver's own health indication.

Designed for real operations

The system is built for 24/7 environments, secure communications, optional redundancy, and integration with existing monitoring and alerting frameworks. It can support single-site deployments or distributed national and regional monitoring networks.

What Meridian delivers

Early warning of GNSS interference and misleading information.
Independent and traceable integrity evidence.
Improved situational awareness and post-event review.

Core capabilities

Independent integrity monitoring.
RF spectrum and position/time plausibility checks.
Navigation-data-level verification.
Legal metrology traceability for audit evidence.

Service boundaries

Meridian provides monitoring and evidence, not a guarantee that every disruption will be detected. Coverage and alerting depend on the agreed deployment and available observations. Monitoring does not itself restore satellite reception or replace a backup timing source; response actions remain with the operator.

Who it supports

Aviation, maritime, telecommunications, energy, financial systems, data centres, and national resilience programmes.

Operational visibility

Sample dashboard showing monitoring-node locations in Ireland, OK, warning and alert states, and a health-state timeline — Example dashboard, not a live feed. The map locates monitoring nodes, OK/warning/alert indicators summarise reported health, and the timeline helps operators review when states changed.

System coverage

Reference-network coverage illustration with metrology sites across Europe and indicative coverage percentages — Current system coverage as illustrated in the project document. Coverage depends on reference availability, satellite visibility, and the deployment.