Aviation Transponder Interrogation Modes
An aviation transponder interrogation mode is the format of a sequence of pulses from an interrogating SSR radar, or similar system, and reply format usually referred to as a "Code" from a transponder, used to determine detailed information from a suitably equipped aircraft.
In its simplest form, a "Mode" or interrogation type, is generally determined by pulse spacing between two or more interrogation pulses. Various modes exist from Mode 1 to 5 for military use, to Mode A, B, C and D and Mode S for civilian use.
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