Squawk code, selective identification by air traffic control, pressure altitude, enhanced surveillance data (such as azimuth data), Automatic Dependent Surveillance Broadcasting (ADSB), Traffic Collision Avoidance (TCAS)Īs you can see from the above table, Mode S contains much more data than the other transponder modes. Squawk code, identification, and pressure altitude Here’s a quick table showing the basic outline of how different transponders work: – Type of Transponder The type of data displayed by the transponder varies depending on the fitted type. The data received is displayed on an air traffic controller’s radar screen.On receiving this interrogation, the transponder transmits its identifying code along with other relevant data back down to the radar.A ground-based secondary surveillance radar sends a radio interrogation signal to the transponder.A unique four-digit code is assigned to an individual aircraft by air traffic control and set in the transponder.Suddenly there were a lot of dots, and knowing which dot belonged to which aircraft became complicated.Ī new system was designed to make it clearer. The radar would fire a microwave beam into the air, which would be reflected by aircraft, presenting the controller with a ‘dot’ on their radar display.Īs aviation grew in popularity, the skies became quite busy. In the early days of radar, air traffic control was a simple affair. This term is an abbreviation of transmitter-responder, a piece of equipment used to identify and fix an aircraft’s position, along with other data, by a radar. These work with mode A, mode C, and mode S transponders. These unique identifiers allow air traffic control units to distinguish between different aircraft. Squawk codes are four-digit codes ranging from 0000 all the way through to 7777 that are set on an aircraft transponder. And, some codes are more important than others! Today we will present you with a squawk codes list detailing some common codes used in aviation and a detailed explanation of their meaning. The answer is through the use of squawk codes. You may have wondered how air traffic control can distinguish between different aircraft on their radar screens.
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