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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.
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.
The greater the altitude, the lower the pressure. When a barometer is supplied with a nonlinear calibration so as to indicate altitude, the instrument is a type of altimeter called a pressure altimeter or barometric altimeter. A pressure altimeter is the altimeter found in most aircraft, and skydivers use wrist-mounted versions for similar ...
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 ...
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 ...
The altimeters provide data on a plane's height above the ground and are critical for bad-weather landings. Still, airline fears about wireless interference from a planned 5G rollout caused issues ...
Warning time can also be short if the aircraft is flying into steep terrain since the downward-looking radio altimeter is the primary sensor used for the warning calculation. The EGPWS improves terrain awareness and warning times by introducing the Terrain Display and the Terrain Data Base Look Ahead protection.
$4,000. Of course, your best bet is to shop around for a high-yield savings account if your bank isn’t paying close to 4%. And it’s a good idea to keep tabs on interest rates during the year ...