The Full Form of OHBR is Over the Horizon Backscatter Radar.
The AN/FPS-118 Over-the-Horizon Backscatter Radar System (OTH-B) was developed in the 1970s and 1980s to provide all-altitude, long-range surveillance of aerial approaches to the United States. OTH-B radar systems use the ionosphere to refract outgoing radar waves and return signals, enabling the system to detect and track targets that would otherwise be hidden by the curvature of the earth, at ranges of up to 1,800 nautical miles.
OHBR
means
Over the Horizon Backscatter Radar
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