In this article, we will teach you What is the principle of OTH radar?, How does OTH radar work?, What is the frequency of OTH radar?
Oth radar (over the horizon radar, radar oth, oth radar frequencies)
The principle of OTH (Over-the-Horizon) radar revolves around the use of lower frequencies, generally in the HF (high frequency) and VHF (very high frequency) bands, to propagate radar signals over long distances in reflecting them on the ionosphere. Unlike conventional radar systems which operate at higher frequencies and are limited by the curvature of the Earth’s surface, other radar systems take advantage of atmospheric layers to extend their range beyond the horizon. By bouncing radar signals from the ionosphere, which acts as a virtual mirror, a radar can detect and track targets hundreds to thousands of kilometers away, providing surveillance capabilities over large areas.
How does OTH radar work?
OTH Radar works by transmitting pulses of radar signals at lower frequencies, such as in the HF and VHF bands, to the ionosphere. These signals reflect back to Earth from the ionospheric layer, allowing the radar system to detect targets that are beyond the line of sight and beyond the normal radar horizon. The radar receiver then captures the reflected signals, which contain information about the location, distance and speed of targets within the radar’s coverage area. Advanced signal processing techniques are used to filter and interpret these signals, allowing other radar systems to distinguish between different types of targets and monitor activities over large areas of sea or land.
What is the frequency of OTH radar?
The frequency of OTH radar generally ranges from about 3 MHz to 30 MHz for HF radar and from 30 MHz to 300 MHz for VHF radar. These lower frequencies are chosen because they can propagate long distances by bouncing off the ionosphere, which acts as a natural reflector for radio waves in these frequency bands. The specific frequency used depends on factors such as the desired range, resolution, and environmental conditions in which the radar operates. Lower frequencies allow OTH radar to achieve detection ranges of hundreds to thousands of kilometers, making them suitable for long-range monitoring and surveillance applications.
The OTH radar spectrum encompasses the HF (high frequency) and VHF (very high frequency) bands. These bands cover frequencies from approximately 3 MHz to 300 MHz. Other radar systems use these lower frequencies because they can propagate long distances by bouncing off the ionosphere. This capability extends the radar’s range well beyond the line-of-sight limitations imposed by the curvature of the Earth, enabling surveillance and surveillance of targets over wide areas, including maritime regions where direct radar coverage may be insufficient. The choice of frequency band within the spectrum depends on factors such as operational requirements, environmental conditions, and the specific capabilities necessary for the radar system’s mission objectives.
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