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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.
With this calculation, the horizon for a radar at a 1-mile (1.6 km) altitude is 89-mile (143 km). The radar horizon with an antenna height of 75 feet (23 m) over the ocean is 10-mile (16 km). However, since the pressure and water vapor content of the atmosphere varies with height, the path used by the radar beam is refracted by the change in ...
AN/FPS-5 long Range Search Radar; AN/FPS-6 height finder; AN/FPS-7 Long Range Search Radar; AN/FPS-8 Medium Range Search Radar; AN/FPS-10 medium-range search/height finder Radar (stripped-down version of the AN/CPS-6B) AN/FPS-14 Medium-range search Radar; AN/FPS-16 tracking radar; AN/FPS-17 detection radar; AN/FPS-18 Medium-range search Radar
A height finder radar is a type of 2-dimensional radar that measures altitude of a target.. The operator slews the antenna toward a desired bearing, identifies a target echo at a desired range on the range height indicator display, then bisects the target with a cursor that is scaled to indicate the approximate altitude of the target. [7]
SPY-6 is intended as a scalable system, with each sensor array assembled from Radar Modular Assemblies (RMA), self-contained radar modules. [ 14 ] The Arleigh Burke deckhouse can only accommodate a 4.3 m (14 ft) version, but the USN claims they need a radar of 6.1 m (20 ft) or more to meet future ballistic missile threats. [ 8 ]
One unique capability of the aerostat is providing persistent long-range coastal surveillance for up to 128 nautical miles (237 kilometers) at 4,000 feet (1,200 meters) elevation based on actual flight done by the aerostat students. It has the capability to be launched continuously for a week by ensuring the sufficiency of the helium content.
The slant range (1) is the hypotenuse of the triangle represented by the altitude of the aircraft and the distance between the radar antenna and the aircraft's ground track (point (3) on the earth directly below the aircraft). In the absence of altitude information, for example from a height finder, the aircraft location would be plotted ...
At any range, with similar azimuth and elevation angles and as viewed by a radar with an unmodulated pulse, the range resolution is approximately equal in distance to half of the pulse duration times the speed of light (approximately 300 meters per microsecond). Radar echoes, showing a representation of the carrier