DO-242A is an aviation system standard published by RTCA, Incorporated.
It contains minimum aviation system performance standards (MASPS) for Automatic Dependent Surveillance-Broadcast (ADS-B).
These standards specify operational characteristics that should be useful to designers, manufacturers, installers, service providers and users of an ADS-B system intended for operational use on an international basis.
DO-242A provides a view of the system-wide operational use of ADS-B, but does not describe a specific technical implementation or design architecture meeting these operational and technical characteristics.
As of 8 Jul 2024, an electronic copy is available for 225 USD at: https://my.rtca.org/productdetails?id=a1B36000001Ick1EAC.