ADS-B Standards

ICAO
www.icao.int
While the International Civil Aviation Organization (ICAO) sets global standards and recommendations for aviation, including ADS-B, the practical implementation and compliance with ADS-B standards often rely on industry-specific organizations such as the Radio Technical Commission for Aeronautics (RTCA) in the United States, EUROCAE (The European Organisation for Civil Aviation Equipment) and EUROCONTROL in Europe.
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RTCA
http://www.rtca.org
There are three standards related to ADS-B:
The DO-242 series is Minimum Aviation System Performance Standards for Automatic Dependent Surveillance Broadcast (ADS-B). These standards include overviews of ADS-B system-level applications typically focus on providing a broad understanding of the functionalities, benefits, and operational aspects of the ADS-B system, without specific technical implementations.    
The DO-260 s