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Over-the-horizon radar (OTH), sometimes called beyond the horizon radar (BTH), is a type of radar system with the ability to detect targets at very long ranges, typically hundreds to thousands of kilometres, beyond the radar horizon, which is the distance limit for ordinary radar.
Over–The–Horizon Backscattering (OTH–B) It is also possible to build radar that has “over the horizon” range, obtained by “bouncing” or “backscattering” radio waves off the ionosphere, the ionized layer at the top of the atmosphere. It uses slightly higher frequencies (up to 50 MHz).
Mar 10, 2022 · Over-the-Horizon (OTH) radars are radar systems that can detect targets very far away and beyond the range limit for ordinary radars. They operate in HF frequency range from 5 to 30 MHz and are suitable for detecting targets typically hundreds to thousands of kilometers away.
The talk provides an introduction to the fundamental principles of high frequency over-the-horizon (OTH) radar, including sky-wave and surface-wave systems as well as other bi-static HF radar architectures.
- What Is Over The Horizon Radar?
- Skywave Systems
- Ground Wave Systems
Over-the-horizon radar (OTH), sometimes referred to beyond the horizon (BTH), is a form of radar technology with the capacity to detect objects at long distances, often hundreds to thousands of kilometers, beyond the radar horizon. Over-the-horizon radar operates in high-frequency(HF) range from 5 to 30 MHz. Beginning in the 1950s and 1960s, severa...
The most frequent type of OTH radar employs skywave or “skip” propagation, in which shortwave radio waves are refracted by an ionized layer in the atmosphere, the ionosphere. When certain environmental conditions are present, radio signals sent into the sky at an angle will be refracted toward the ground and allowed to return to earth beyond the ho...
A different sort of OTH radar uses much lower longwave frequencies. Radio waves at these frequencies can bend around objects and follow the curving contour of the earth, traveling beyond the horizon. By the same route, the echo’s were reflected back to the transmitter location. These ground waves have the greatest range over water. The signal recei...
Jul 24, 2024 · The radar horizon is the maximum distance a radar system can see ground-level targets. Its value depends only on the height of the radar emitter and receiver: the higher they are, the farther the horizon is.
The radar horizon is a critical area of performance for aircraft detection systems, defined by the distance at which the radar beam rises enough above the Earth's surface to make detection of a target at the lowest level possible.
