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Abstract

Automatic Dependent Surveillance-Broadcast (ADS-B) transmits aircraft target data to the ATC System using the ASTERIX (All Purpose Structured Eurocontrol Surveillance Information Exchange) Category 021 format. At Perum LPPNPI AirNav Denpasar Branch, the Thales AX680 ADS-B was upgraded from ASTERIX edition 0.23 to edition 2.1; within less than a year, aircraft targets intermittently disappeared and reappeared on the ATC System display, and the configuration was reverted to edition 0.23. This descriptive case study examines the problem by comparing the Cat 021 data items of both editions, using target recordings from the Tools Recorder and WireShark, Hexadecimal-Binary-Decimal conversion, and the Eurocontrol Cat 021 specification (Part 12). Edition 2.1 contains 23 data items compared with 15 in edition 0.23, including items that carry ADS-B version and quality information defined for DO-260B/ED-102A avionics. The most plausible explanation is that targets from aircraft with older DO-260/ED-102 avionics, which cannot supply these parameters, were handled inconsistently by the ATC System under edition 2.1; reverting to edition 0.23 restored stable target detection. The study highlights the importance of understanding surveillance data formats and fleet avionics readiness before migrating to a newer data standard, and of a staged migration with documented acceptance criteria.

Keywords

ADS-B ASTERIX Cat 021 avionics interoperability aviation surveillance

Article Details

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