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A mathematical relationship to describe a function of time, expressed in terms of discrete time; Compare: continuous-time equation, difference equation, differential equation, Laplace transform, state-space model, Z transform; See Also: first-order filter, unit functions; Distance. Method of measurement dependent on use; Synonyms: range; Distance Measuring Equipment (DME). Equipment for measuring distance, usually from an aircraft to a ground station; usually part of a Tactical Air Navigation system DMG. Digital Map Generator DNS. Doppler Navigation System.