Empirical Earth · Radio & Long-Distance Signals

Over-the-horizon radar — built to beat the curve

The claim

“Radar tracks targets thousands of km away, so there is no curve in the way.”

What is measured

Conventional radar is blocked by the curve within tens of km; over-the-horizon radar exists only to bounce HF off the ionosphere and reach 1,000–3,000 km past that horizon, a technology built to defeat a curvature a flat Earth would not have.

What would show this is wrong

a conventional line-of-sight radar tracking low targets thousands of km away with no ionospheric bounce, making over-the-horizon radar pointless.

Sources

  1. Over-the-horizon (OTH) radar. Conventional line-of-sight radar is limited by the radar horizon set by Earth’s curvature; OTH-B skywave radar refracts HF (3–30 MHz) off the ionosphere to dete link
  2. Over-the-horizon radar skip zone. Skywave over-the-horizon radar refracts HF signals off the ionosphere to detect targets at roughly 1,000–3,000 km, but cannot see closer targets: the beam o link
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