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Updated: May 2, 2025
Over-the-horizon HF radars use the ionosphere as a kind of mirror to "see" around the curvature of the earth. They have a variety of uses, both military and civilian. And they have the advantage over line-of-sight microwave radars of being able to cover enormous areas with much less power and at a fraction of the cost of the latter.
Then these lines HF, BG, will bear to one another the said ratio of the velocities.
Over-the-horizon or Ionospheric HF Radar OTHR On the first day the "knock-knock-knock" went on continuously for over ten hours.
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