Looking for abbreviations of ALT? long-wave and radar data demonstrate that this long-wave tilt field variability is largely responsible for radar backscatter variations observed at a given wind speed, particularly at wind speeds below 5–7 m s21.
LiDAR invented in 1960s-Combines a laser’s focus with radar’s concepts of measuring reflection time frequency radar altimeter designs such as those currently under development for the Earth Observing System, local-scale high-resolution (<0.5 km) topography of the Moon can only be directly assessed from high-repetition-rate orbital laser altimetry.
Technological breakthroughs in laser … A laser-based altimeter for use on-board an aircraft comprises: a first housing including a hollow cavity and an exit aperture, and a second housing including a hollow cavity and an entrance aperture.
Using altimetry in this form requires the least knowledge about the surface at which the altimeter is pointed. It is Radar altimeter. This is just a quick, representative selection to give you an idea of pressure, radio, and laser altimeters and how they compare: US Patent 2004/0141170 A1: System for profiling objects on terrain forward and below an aircraft utilizing a cross-track laser altimeter by James R. Jamieson et al. ALT - Radar altimeter. ... Pressure altitude is the indicated altitude when an altimeter is set to 29.92 (1,013.2 mb). Radar developed during WWII - Radio Waves emitted and since we know the speed at which the radio waves are traveling, we can determine the distance from the source by the time it takes to reflect back. Results are consistent with, and provide quantititative support for, recent satellite altimeter studies eliciting signatures Radio altimeter …
It may be read on a radio or radar altimeter.
The measurement of altitude is called altimetry, which is related to the term bathymetry, the measurement of depth under water.The most common unit for altimeter calibration worldwide is hectopascals (hPa), except for North America and Japan where inches of mercury (inHg) are used. Shum et al. Everything Explained: All About Altitude.
An altimeter or an altitude meter is an instrument used to measure the altitude of an object above a fixed level. Granted August 22, 2006. Applied Laser Technology (various locations) ALT: Alternative Lengthening of Telomeres (cells) ALT: Accelerated Life Test: ALT: ... weather radar and radar altimeter system kits. Radar vs. Laser Altimetry in Orbit and Attitude Solutions Altimetry in the form of "crossovers" is what is usually used for orbit determination. A laser source and a plurality of first optical elements are fixedly supported in a compact configuration within the hollow cavity of the first housing. 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.
With this, the altimeter reading is better approximation of actual altitude, but since temperature also changes the rate of pressure change with altitude, it still only matches the geometric altitude exactly on the ground at the airport for which the altimeter setting is.
[1990] give a good description of the use of altimeter crossover constraint