How secondary surveillance radar works
In short: Secondary surveillance radar uses transponders to provide air traffic controllers with specific information about aircraft.
1. An interrogator, usually a ground station, sends out signals to the target aircraft. 2. The target aircraft transponder replies to signals by transmitting a coded reply signal containing the requested information. 3. The SSR processor receives the reply, providing the Mode A Id or the Mode C height on the Radar display to the controller. 4. This provides continuous detection of surveillance of air traffic disposition for Air Traffic Control.
Sources: Wikipedia, “Secondary surveillance radar (Wikipedia)” (CC BY-SA 4.0). Illustrative, not to scale.
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