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laser altimeter

   Also found in: Acronyms 0.04 sec.
laser altimeter [′lā·zər al¦tim·əd·ər]
(navigation)
An altimeter in which a laser beam, modulated by radio frequencies, is directed downward from an aircraft, and the laser light reflected from the terrain is picked up by a telescope system, sensed by a photomultiplier, and phase-compared with the transmitted signal to obtain the round-trip propagation time; the height above ground equals one-half the product of the propagation time and the speed of light.


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Mission equipment includes low light-level camera, infrared line scanner, airborne video recorder and laser altimeter.
The laser altimeter is extremely important to our understanding of the geological and physical processes on Mars," says James Head, a planetary geologist at Brown University in Providence, R.
These include space-launched laser radar transmitters for several Strategic Defense Initiative ("Star Wars") experiments, the Mars Observer Laser Altimeter (MOLA) transmitter designed to map the surface of Mars, and several military laser rangefinder/target designators and electro-optic countermeasure (EOCM) transmitters.
 
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