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The dipole antenna of a radar altimeter of 1947. A radar altimeter (RA), also called a radio altimeter (RALT), electronic altimeter, reflection altimeter, or low-range radio altimeter (LRRA), measures altitude above the terrain presently beneath an aircraft or spacecraft by timing how long it takes a beam of radio waves to travel to ground, reflect, and return to the craft.
Rad Alt Radio Altitude Radar: RAdio Detection And Ranging RAI Radio altimeter indicator RAIM Receiver Autonomous Integrity Monitoring: Or: remote autonomous integrity monitoring RALT Radar or radio altimeter: RAREPS Weather Radar Reports [6] Provided by Air Traffic Controllers RAS rectified air speed RA(T) restricted area (temporary) RAT ram ...
In aviation, atmospheric sciences and broadcasting, a height above ground level (AGL [1] or HAGL) is a height measured with respect to the underlying ground surface.This is as opposed to height above mean sea level (AMSL or HAMSL), height above ellipsoid (HAE, as reported by a GPS receiver), or height above average terrain (AAT or HAAT, in broadcast engineering).
A Voyage by Radar by R.C. Newhouse, Radio Development Engineer, published in the Bell Laboratories Record Vol. XXV No. 5 - May 1947, pages 181-189; The History of Radar – RC Newhouse of Bell Labs obtained a patent, and his experiments performed throughout the decade eventually led to the radio altimeter, which became operational in 1937.
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Rifleman Radio is a handheld, intra-squad tactical radio: Thales Group, General Dynamics: AN/PRC-155: Joint Tactical Radio System (JTRS) Handheld, Manpack & Small Form Fit (HMS) General Dynamics: AN/PRC-158: Falcon® IV Multi-channel Manpack (MCMP) radio: L3Harris Technologies: AN/PRC-159: Falcon® III wideband team radio: L3Harris Technologies ...
Pressure altimeter measuring atmospheric pressure, which decreases as altitude increases. Since atmospheric pressure varies with the weather, too, a recent local measure of the pressure at a known altitude is needed to calibrate the altimeter. Stereoscopy in aerial photography. Aerial lidar and satellite laser altimetry.
In the largest telescopes, the mass and cost of an equatorial mount is prohibitive and they have been superseded by computer-controlled altazimuth mounts. [5] The simple structure of an altazimuth mount allows significant cost reductions, in spite of the additional cost associated with the more complex tracking and image-orienting mechanisms. [6]