Passive radar

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Science and technology

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What Wikipedia says

Passive radar (also referred to as parasitic radar, passive coherent location, passive surveillance, and passive covert radar) is a class of radar systems that detect and track objects by processing reflections from non-cooperative sources of illumination in the environment, such as commercial broadcast and communications signals.

Excerpt from the Wikipedia article “Passive radar”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Matti Blume, CC BY-SA 4.0, via Wikimedia Commons.