Radar altimeter
Measures an aircraft's height above the terrain / From Wikipedia, the free encyclopedia
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"LRRA" redirects here. For the British constitutional law, see Legislative and Regulatory Reform Act 2006.
A radar altimeter (RA), also called a radio altimeter (RALT), electronic altimeter, reflection altimeter, or low-range radio altimeter (LRRA), measures altitude above the terrain presently beneath an aircraft or spacecraft by timing how long it takes a beam of radio waves to travel to ground, reflect, and return to the craft. This type of altimeter provides the distance between the antenna and the ground directly below it, in contrast to a barometric altimeter which provides the distance above a defined vertical datum, usually mean sea level.