radar altimeter altitude

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• radar altimeter — noun A high altitude radio altimeter • • • Main Entry: ↑radar …   Useful english dictionary

• Radar altimeter — A radar altimeter, radio altimeter, low range radio altimeter (LRRA) or simply RA measures altitude above the terrain presently beneath an aircraft or spacecraft. This type of altimeter provides the distance between the plane and the ground… …   Wikipedia

• altitude hold — An autopilot mode that permits a barometric/radio/radar altimeter altitude to be maintained …   Aviation dictionary

• Altimeter — An altimeter is an instrument used to measure the altitude of an object above a fixed level. The measurement of altitude is called altimetry, which is related to the term bathymetry, the measurement of depth underwater. Aircraft Instrumentation… …   Wikipedia

• radar — /ray dahr/, n. 1. Electronics. a device for determining the presence and location of an object by measuring the time for the echo of a radio wave to return from it and the direction from which it returns. 2. a means or sense of awareness or… …   Universalium

• radar altitude — The altitude of an aircraft determined by a radar altimeter. This is the actual distance between the aircraft and the terrain feature below the aircraft. Radar altitude is very close to absolute altitude. See absolute altitude …   Aviation dictionary

• radar altitude control mode — In an automatic flight control system, a control mode in which the height of an aircraft is maintained by referencing signals from a radar altimeter …   Aviation dictionary

• altitude — i. The vertical distance of a level, a point, or an object considered as a point, measured from mean sea level (ICAO). In the case of aircraft in flight, it is normally expressed in flight levels or hundreds of feet. For example, an aircraft… …   Aviation dictionary

• altimeter — An instrument to indicate the height of an aircraft above a predetermined datum, normally sea level. Specifically, an instrument similar to an aneroid barometer that utilizes the change of atmospheric pressure with altitude to indicate the… …   Aviation dictionary

• altimeter — [ altɪmi:tə] noun an instrument for determining altitude attained, especially a barometric or radar device fitted in an aircraft. Origin early 20th cent.: from L. altus high + meter …   English new terms dictionary

• absolute altimeter — An instrument intended to give acceptably accurate, direct indications of absolute altitude (i.e., the vertical distance of the aircraft from the surface of the earth). A radio or a radar altimeter indicates absolute altitude roughly because of… …   Aviation dictionary