laser altimeter


Also found in: Acronyms.

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.

laser altimeter

An altimeter that measures the time it takes for a laser pulse to return from the ground directly below the aircraft. This time is converted into height above the ground, and this is what the altimeter indicates. It is more accurate than a radio or radar altimeter. A laser altimeter measures and indicates absolute altitude.
References in periodicals archive ?
Modeling laser altimeter return waveforms over complex vegetation using high-resolution elevation data.
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.
The laser altimeter is a pulsed gallium-arsenide diode laser, transmitting and receiving up to 4,000 pulses per second at a wavelength of 0.
A laser altimeter sends and retrieves pulses of light to measure mountain heights and canyon depths.
The Team is being contracted for the provision of services required to design, test, fabricate, deliver, operate, and evaluate Space Laser Systems for the ICESat-II Advanced Topographic Laser Altimeter System (ATLAS) Instrument for the ICESat-II mission.
Kinney has won numerous awards and honors, including the Presidential Rank Award for Meritorious Service, the NASA Medal for Outstanding Leadership and several NASA Group Achievement Awards for projects such as the Keck Observatory Archive and the James Webb Space Telescope, the Gamma-ray Large Area Space Telescope (now known as the Fermi Gamma-ray Space Telescope) and Lunar Orbiter Laser Altimeter.
Researchers on the flights will also be using upgraded technology called the "Airborne Topographic Mapper" a laser altimeter that can transmit 10,000 pulses every second.
While studying lunar topography derived from the laser altimeter on NASA's Lunar Reconnaissance Orbiter (http://is.
Those data include 4 billion measurements made by the orbiter's laser altimeter, which allowed scientists to construct an elevation map of the moon's pockmarked surface.
After about one year taking data, we already have nearly 3 billion data points from the Lunar Orbiter Laser Altimeter on board the LRO spacecraft, with near-uniform longitudinal coverage.
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.
The main instrument is a laser altimeter that measures the height of the ice surface.

Full browser ?