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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

radar altimeter

radar altimeterclick for a larger image
An altimeter that uses radar to find the exact height of the aircraft above the surface. There are basically two types of radar altimeters—those employing pulse radar and others that are frequency-modulated continuous wave radar. The time interval between the transmitted and the received signals is measured in terms of feet or meters above the surface.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
The US Naval Research Laboratory (NRL) combines Envisat RA-2 data with data from similar radar altimeters aboard the Jason-1 and GFO satellites to enhance overall accuracy and spatial and temporal coverage, forming the source for altimetry products which, in turn, form the basis for NOAA/AOML-produced maps of tropical cyclone heat potential depicting the upper ocean thermal conditions, shown here overlaid against Hurricane Frances' track so far.
We intercepted the VASIs again, and this time the Nav called out our height off the Radar Altimeter. The rain had let up a little and we were able to land this time around.
Turning through west, the flight lead's radar altimeter, set to 5,000 feet, went off.
The Jason satellite, which is jointly operated by the United States and France and is equipped with a radar altimeter, happened to pass over the eastern Indian Ocean about 2 hours after the quake occurred.
Italy's Tornado IDS aircraft, on the other hand, have not received any substantial upgrades since they entered service, so they are to be fitted with a new navigation system, radar altimeter, and data bus.
This article describes the development of a frequency modulated (FM) radar altimeter for measuring the height of flying objects.
The anti-ship BGM-109B uses inertial navigation coupled to a midcourse radar altimeter and an active radar for terminal guidance.
Additionally, these avionics fulfill Part 135 radar altimeter and Helicopter Air Ambulance (HAA) equipage requirements set forth by the FAA, as well as Helicopter Terrain Awareness and Warning System (HTAWS) and Automatic Dependent Surveillance-Broadcast (ADS-B) initiatives.
In talking with John Dors, owner of Instrument Overhaul Service of San Diego (http://instrumentoverhaul.com), I barely got the initial description of what I was seeking out of my mouth before he interrupted, "Oh, you're looking for an altimeter you can adjust to zero on the ground so you can use it like a poor-man's radar altimeter. Yeah, I can build that."

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