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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 density. With a standard atmosphere, electromagnetic waves are generally bent or refracted downward.
The height of the echoes increases with the distance to the radar, as represented in the adjacent image. This change is not a straight line but a curve as the surface of the Earth is curved and sinks below the radar horizon. For fixed-site installations, north is usually represented at the top of the image
The frequency of radio waves used by most radars, in the form of microwaves, propagate in straight lines.This generally limits the detection range of radar systems to objects on their horizon (generally referred to as "line of sight" since the aircraft must be at least theoretically visible to a person at the location and elevation of the radar transmitter) due to the curvature of the Earth.
Eglin AFB Site C-6 is a United States Space Force radar station which houses the AN/FPS-85 phased array radar, associated computer processing system(s), and radar control equipment designed and constructed for the U.S. Air Force by the Bendix Communications Division, Bendix Corporation.
The acquisition radar operator was to the left of the BCO and the computer operator was on the right. [citation needed] Separate stations at the "target radar control console" and "missile radar control console" were also used. The later Anti Tactical Ballistic Missile (ATBM) version of the battery control console was slightly different.
English: Height of a radar beam above Earth (AGL). Calculation of the height of radar echoes in the operating principles. Assuming the Earth is round, the radar beam in vacuum would raise according to the reverse curvature of the Earth. However, the atmosphere as an refractive index that diminish with height, due to the variation of its density.
Predel-E (in Russian: Предел-Э [1]) is a Russian military over-the-horizon radar system shown since 2017, [2] designed to detect ships in coastal areas. [3]It was developed by Concern Morinformsystem-Agat, with at least one variant designed by NPP Salyut. [3]
The AN/FPS-6 Radar was a long-range height finding radar used by the United States Air Force's Air Defense Command. The AN/FPS-6 radar was introduced into service in the late 1950s and served as the principal height-finder radar for the United States for several decades thereafter. It was also used by the Royal Air Force alongside their AMES ...