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Aviation transponder interrogation modes

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An aviation transponder interrogation mode is the format of a sequence of pulses from an interrogating radar, or similar system, 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 4 for military use, to Mode A, B, C and D and Mode S for civilian use.

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