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Cosa (chi) è recording altimeter - definizione
DEVICE WHICH MEASURES ALTITUDE ABOVE THE TERRAIN PRESENTLY BENEATH AN AIRCRAFT OR SPACECRAFT
Radio altimeter; Combined altitude radar altimeter; LRRA; Low Range Radio Altimeter; Radioaltimeter; RADALT; Radar Altimeter; Electronic altimeter; FuG 101; Radar altimetry
.jpg?width=200 "Contemporary radar altimeter equipment in 2018.")
 (14569817878) (cropped).jpg?width=200 "Early diagram of the concept of a radar altimeter, shown in a 1922 Bell telephone magazine.")
![Radar altimeters are used in science, with this diagram showing how a spacecraft could detect surface smoothness on the surface of [[Venus]].](https://commons.wikimedia.org/wiki/Special:FilePath/Smooth and rough on reflection.jpg?width=200 "Radar altimeters are used in science, with this diagram showing how a spacecraft could detect surface smoothness on the surface of [[Venus]].")
![Maintenance being performed on the radar altimeter of a [[Northrop Grumman EA-6B Prowler]].](https://commons.wikimedia.org/wiki/Special:FilePath/US Navy 070311-N-8590D-005 Aviation Electronics Technician Airman Kyle Purcell replaces grounding straps on the radar altimeter of an EA-6B Prowler.jpg?width=200 "Maintenance being performed on the radar altimeter of a [[Northrop Grumman EA-6B Prowler]].")
Radar altimeter
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.
Altimeter
![m}}. Reference pressure of about 29.92 [[inHg]] (1013 hPa) is showing in the ''Kollsman window''](https://commons.wikimedia.org/wiki/Special:FilePath/3-Pointer Altimeter.svg?width=200 "m}}. Reference pressure of about 29.92 [[inHg]] (1013 hPa) is showing in the ''Kollsman window''")
![The altimeter on this [[Piper PA-28]] is seen on the top row of instruments, second from right](https://commons.wikimedia.org/wiki/Special:FilePath/Cockpit of Piper PA-28-151 (G-BOYH) at Bristol Airport, England 15May2016 arp.jpg?width=200 "The altimeter on this [[Piper PA-28]] is seen on the top row of instruments, second from right")
INSTRUMENT USED TO MEASURE THE ALTITUDE OF AN OBJECT ABOVE A FIXED LEVEL
Altimetry; Pressure altimeter; Barometric altimeter; ALSTG; Kollsman window; Sonic altimeter; Aneroid altimeter; Altitude meter; Altimeter-setting indicator; Altimetric; Barometric sensor; Statoscope; Altimiter
·noun An instrument for taking altitudes, as a quadrant, sextant, ·etc.
altimetry
INSTRUMENT USED TO MEASURE THE ALTITUDE OF AN OBJECT ABOVE A FIXED LEVEL
Altimetry; Pressure altimeter; Barometric altimeter; ALSTG; Kollsman window; Sonic altimeter; Aneroid altimeter; Altitude meter; Altimeter-setting indicator; Altimetric; Barometric sensor; Statoscope; Altimiter
[al't?m?tri]
¦ noun the measurement of height or altitude.
Derivatives
altimetric adjective
altimetrically adverb
Origin
ME: from med. L. altimetria.
Wikipedia
Radar altimeter
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.
