Radar altimeter

radio altimeterradar altimetryelectronic altimeterradaraltimeteraltimetrydelay-Doppler radarelectromagnetic sensorsRadar Altimeter (RA)radar altimeters
A radar altimeter, electronic altimeter, reflection altimeter, radio altimeter (RADALT), low range radio altimeter (LRRA) or simply RA, used on aircraft, measures altitude above the terrain presently beneath an aircraft or spacecraft by timing how long it takes a beam of radio waves to reflect from the ground and return to the plane.wikipedia
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