Long-range radar (OTH) refers to radar systems capable of detecting and tracking targets beyond the normal radar horizon, which is limited by the curvature of the earth and obstacles like mountains. OTH Radar achieves this by using lower frequencies, typically in the HF (high frequency) or VHF (very high frequency) bands, which can propagate long distances by bouncing signals out of the ionosphere. This allows the radar to extend its range well beyond line-of-sight limitations, providing surveillance coverage over large areas, including maritime regions where traditional radar coverage may be insufficient.
Long-range radar systems are designed to detect and track targets at extended ranges compared to conventional radar systems. These radars use advanced technologies such as phased array antennas, high-power transmitters and sophisticated signal processing algorithms to achieve greater detection ranges. Long-range radar is commonly used in a variety of applications, including air traffic control, weather monitoring, military surveillance, and maritime navigation, where the ability to detect targets at distant ranges is crucial for effectiveness and operational security.
Beyond Horizon Range, refers to distances or areas that exceed line of sight limitations imposed by the curvature of the Earth or obstacles such as mountains. In radar terminology, Beyond Horizon Range generally refers to regions where radar signals cannot reach directly due to these obstructions. Over-the-horizon (OTH) radar systems are specifically designed to overcome these limitations by bouncing radar signals off the ionosphere or other atmospheric layers to extend radar coverage beyond the radar horizon. This capability is particularly advantageous for surveillance in remote or maritime areas where direct line-of-sight radar coverage is impractical or insufficient.