Secondary Radar
Secondary radar is a surveillance system used in aviation to determine the position of aircraft. It works by sending out a radio signal that is received by a transponder on the aircraft. The transponder then sends back a signal that includes information such as the aircraft's altitude and identification code. This information is then displayed on the radar screen for air traffic controllers to monitor. Secondary radar is used in conjunction with primary radar, which detects the presence of aircraft but does not provide as much information about their position and altitude.
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