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radar horizon

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radar horizon [′rā‚där hə‚rīz·ən]
(navigation)
The distance to which a radar's operation is limited by the quasi-optical characteristics of the radio waves employed.
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However, it remains to be seen how long it will take the Federal Aviation Administration to routinely approve flights through controlled airspace by large unmanned airships In 2006 Sanswire Networks (whose parent company is GlobeTel Communications) unveiled a 75-metre-long technology demonstrator for its Stratellite solar-powered communications platform, which was designed to cruise autonomously or as a remotely-piloted system at up to 65,000 ft, giving a radar horizon at around 300 nm.
Lighter than air by Armada International
Since most radar signals travel in a straight line, this means that a receiver beyond the radar horizon cannot detect a transmitter.
Needles in the Haystack: hunting mobile electronic targets by Pietrucha, Maj Michael / Air & Space Power Journal
But the E-2C or AWACS may see a track that is not within a ship's radar horizon, for example.
Navy leads effort to field joint air-defense network by Erwin, Sandra I. / National Defense
 
 
 
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