All Purpose Structured Eurocontrol Surveillance Information Exchange

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All Purpose Structured Eurocontrol Surveillance Information Exchange ( ASTERIX ) is a protocol published by EUROCONTROL for the exchange of flight surveillance data. This includes above all radar data , but also z. B. Weather data, data for time synchronization and much more. The protocol is increasingly replacing older protocols such as CAA (protocol) , the Radar Data Interchange Format and MADREC .

The ASTERIX protocol is divided into so-called categories from 0 to 255 (although not all numbers have been assigned yet). Each category includes a certain type of data (e.g. weather data); some categories are completely reserved for military air traffic control.

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