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MADRE over-the-horizon radar at the NRL's Chesapeake Bay Detachment U.S. Navy Relocatable Over-the-Horizon Radar station. The most common type of OTH radar, OTH-B (backscatter), [3] uses skywave or "skip" propagation, in which shortwave radio waves are refracted off an ionized layer in the atmosphere, the ionosphere, and return to Earth some distance away.
AN/APS-112 improved AN/APS-59 AWACS radar; AN/APS-113 weather radar by Bendix Corporation for UH-1 and EC-47; AN/APS-115 maritime surveillance radar with two radar antennas by Texas Instruments for P-3 Orion; AN/APS-116 derivative of AN/APS-115 maritime surveillance radar with only one radar antenna by Texas Instruments for S-3A
The unclaimed signal was a source of speculation, giving rise to theories such as Soviet brainwashing and weather modification experiments. However, because of its distinctive transmission pattern, many experts and amateur radio hobbyists realized it was an over-the-horizon radar system.
Dnestr radar, Soviet and Russian early warning radars; Don-2N radar, Russian missile defence radar in Moscow; Duga radar, Soviet over-the-horizon early-warning radar system; Dunay radar, Soviet missile defence radar; GIRAFFE, Swedish family of early warning radar systems; EL/M-2080 Green Pine, Israeli ground-based missile-defense radar by Elta
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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 Jindalee Operational Radar Network (JORN) is an over-the-horizon radar (OHR) network operated by the Royal Australian Air Force (RAAF) that can monitor air and sea movements across 37,000 square kilometres (14,000 sq mi). [citation needed] It has a normal operating range of 1,000–3,000 kilometres (620–1,860 mi). [1]
MASINT radar sensors may be on space, sea, air, and fixed or mobile platforms. Specialized MASINT radar techniques include line-of-sight (LOS), over-the-horizon, synthetic aperture radar (SAR), inverse synthetic aperture radar (ISAR) and multistatic. It involves the active or passive collection of energy reflected from a target or object by LOS ...