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The TopSky (formerly EUROCAT)[1] system is a computerised air traffic control and management solution[buzzword] developed by Thales Air Systems (formerly Thomson CSF).[2] It utilises a distributed computing architecture and is capable of integrating geographically dispersed air traffic control units within a Flight Information Region (e.g. control towers at different airports and en route control centres) into a single coherent system.

During 2012, the Thales marketing name has been changed from Eurocat to TopSky.


TopSky handles a large variety of different functions required for the smooth operation of air traffic control and management. A non-exhaustive list includes:[3]

  • Surveillance data processing and track correlation (radar, ADS-B, ADS-C etc.)
  • Flight plan processing
  • Communication (CPDLC etc.)
  • Aeronautical information data processing (NOTAMs, QNH, wind aloft etc.)
  • Flow control and sequencing
  • Human-machine interfacing (e.g. correlating data to generate controller's display)
  • Data recording
  • Controller situational awareness and alerts generation


The software is used in many countries, including:


  1. ^ "Code Modernization & Language: The Eurocat Ada Transformation - TSRI | Automated Software Application Code Modernization, Automated UML Documentation, Automated Refactoring at 100% Automation". TSRI. Retrieved 2019-06-05.
  2. ^ Thales Group. "EUROCAT". Archived from the original on 2012-03-23. Retrieved 2011-09-13.
  3. ^ Thales Group. "EUROCAT". Archived from the original (PDF) on 2011-10-26. Retrieved 2011-09-13.