It’s not technically difficult to detect even a small drone with suitable radar equipment. “Almost all radars can detect a drone,” says Tom Driscoll, who is chief technical officer and a cofounder of Echodyne Co., a startup based in Kirkland, Wash., that is selling a radar system specifically tailored to detect small drones. The tricky part is distinguishing them from birds, which have about the same radar cross section. And for that, “the subtleties are important,” says Driscoll.

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