266 – Secondary Surveillance Radar

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Guest: Mike Sharples    Host: Markus Voelter    Shownoter: Stefan Rillaert

Secondary surveillance radar (SSR) is the radar technology used in aviation to query transponders; it forms the backbone of today’s air traffic control infrastructure. Our guest in this episode is Mike Sharples who has been part of the development of the technology and is intimately familiar with the details. We discuss the importance of SSR today, the details of the protocol, the difference between and evolution from Mode A/C to S as well as the relationship to ADS-B.