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Radar altimeter

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How It works Altimeter

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Support: Altimeter Calibration on a Garmin fēnix® 5

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Analog Devices 60 GHz FMCW Radar Systems for Industrial Applications

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Ground Penetrating Radar (GPR) + drone to locate gas pipes

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Drone with Zond-12e Drone 500A ground penetrating radar flying at 60 cm AGL altitude

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. 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 datum, usually mean sea level.
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    • ITU definition 

    • Principle 

    • History 

    • Civil aviation applications 

    • Military aviation applications