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.

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.
References in periodicals archive ?
Preliminary experience and technical aspects on the Jason-1 validation and calibration radar altimeter by using GPS buoys, oral presentation at the European Geophysical Society, XXV General Assembly, Nice, France.
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.
The Ka band altimeter, ALTIKA, provided by CNES consists of a Ka-band radar altimeter, operating at 35.
Its proximity fuse" (it used a radar altimeter arrangement).
For example, if you're adjusting the radar altimeter, your hands must go into the bay while the vaneaxial fan spins.
I picked out the Visual Approach Slope Indicators (VASIs) and started down, but I couldn't tell how high above the runway we actually were because of the rain and blur of lights (we typically didn't use the Radar Altimeter to call out altitudes).
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.
He released the collective trim switch to engage the automatic flight control system (AFCS) radar altimeter hold.
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.
Built by Rutan's brother, Burt, at his Scaled Composites aircraft plant in Mojave, the carbon-fiber capsule is fitted with a pilot station and private sleeping quarters, satellite communication and navigation systems, a radar altimeter and satellite locater beacon.

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