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radar altimeter

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radar altimeter [′rā‚där al′tim·əd·ər]
(navigation)
A radio altimeter, useful at altitudes much greater than the 5000-foot (1500-meter) limit of frequency-modulated radio altimeters, in which simple pulse-type radar equipment is used to send a pulse straight down from an aircraft and to measure its total time of travel to the surface and back to the aircraft. Also known as high-altitude radio altimeter; pulse-type altimeter.
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It carried a mass spectrometer along with a video camera and radar altimeter.
LUNAR WATER AN INDIAN FIND by Mail Today (New Delhi, India)
Using another instrument aboard Envisat, the radar altimeter, scientists measured sea ice thickness over the Arctic from 2002 to 2008.
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Scientific study The box-shaped lunar probe carried a video imaging system, a radar altimeter and a mass spectrometer.
India lands its first moon mission by Aljazeera.net
 
 
 
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