Radar altimeter

radar altimeter

(Also called radio altimeter.) An onboard radar for determining the altitude of an aircraft above an underlying surface.

Pulse-radar techniques measure altitude in terms of the transit time of the radar pulse; continuous-wave radar measures altitude in terms of the phase difference between the transmitted and received signals.

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An instrument that determines the altitude of an object with respect to a fixed level.

1. A measure (or condition) of height, especially of great height, as a mountain top or aircraft flight level.