A Programme Worth Watching; Low-cost Radar  

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Jenis: Article from Bulletin/Magazine
Dalam koleksi: The Economist (http://search.proquest.com/) vol. 406 no. 8827 (Mar. 2013), page 75.
Topik: Radar Systems; Experiments; Testing; Television Broadcasting; Research & Development--R&D; Air Traffic Control

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Perpustakaan Pusat (Semanggi) Nomor Panggil: EE29.76 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Conventional radar uses a rotating antenna to sweep the sky, sending out radio pulses and detecting those which are reflected back from aircraft. The experimental system that will begin operation in June in London does not send out any signals of its own, but instead relies on a network of receivers to pick up television programmes. It is hard to imagine British TV staples like "Downton Abbey" being used to detect aircraft. But that, in effect, is what will be happening. . By measuring the slight differences between the original broadcast signal and the signals reflected from aircraft flying in the vicinity, it is possible to plot the position of aircraft on a screen, just as is done with conventional radar. The difference is that a system that relies on signals already in the air can be simpler, cheaper and use a lot less power. The London trial is being run by Thales UK, an engineering group, Roke Manor Research, an R&D consultancy, and NATS, which manages Britain's air-traffic control. With growing demand for wireless devices, passive radar would allow the radio spectrum currently used by conventional radar to be freed up and auctioned off to mobile operators.

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