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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.
SRAL (Synthetic Aperture Radar Altimeter) is the main topographic instrument to provide accurate topography measurements over sea ice, ice sheets, rivers, and lakes. It uses dual-frequency K u and C band and is supported by a microwave radiometer (MWR) for atmospheric correction and a DORIS receiver for orbit positioning.
AN/SPS-64 Navigation radar, a surface navigation and search radar, made by Raytheon and used both commercially (brand name Mariner's Pathfinder) and by navies worldwide. [ citation needed ] AN/SPS-65 Development of AN/SPS-58 by Westinghouse as a low altitude radar that is part of the Mark 91 Fire Control System for the Sea Sparrow air defense ...
The International Space Station (ISS) has long been used as a central satellite platform for other sensors, including Earth observation sensors. For example: LIS, SAGE III, TSIS-I, ECOSTRESS, GEDI, OCO-3, Diwata-1, and HICO. Jason-3: Active NASA and CNES: 2016 Radar altimeter used to monitor ocean surface height. KhalifaSat: Active MBRSC: 2018
Pages in category "Earth satellite radar altimeters" The following 19 pages are in this category, out of 19 total. This list may not reflect recent changes. C.
K band replaced X band back in the '80s and is the most widely used radar band in the United States, operating between 18.0 GHz and 27.0 GHz. When a K-band alert goes off, it may be the police. ...
Radar altimeter technology is also used in terrain-following radar allowing combat aircraft to fly at very low height above the terrain. After extensive research and experimentation, it has been shown that "phase radio-altimeters" are most suitable for ground effect vehicles, as compared to laser, isotropic or ultrasonic altimeters. [3]
This averages from 2.5 to 3 percent of the home’s sale price, which means that if you sell for $300,000, you save between $7,500 and $9,000. You’re in control: Having no middleman between you ...