Flightradar24
More widespread in size are those radars seen at airports, with rotating antennas 20– forty ft (6–12 m) broad. Radars supposed for mobile use, particularly airborne radars, are fairly compact. As early as 1886, German physicist Heinrich Hertz showed that radio waves could be reflected from stable objects. In 1895, Alexander Popov, a physics instructor on the Imperial Russian Navy school in Kronstadt, developed an apparatus using a coherer tube for detecting distant lightning strikes. In 1897, while testing this tools for speaking between two ships within the Baltic Sea, he took notice of an interference beat brought on by…
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