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Low-cost radar 低成本雷达 A programme worth watching 值得一看的节目 How air-traffic control can use television signals toplot aircraft 空中交通管制局如何利用电视信号找出飞行器位置? A NOVEL radar will soon be helping to keep an eye on aircraft flying over London. 很快，一种新式雷达将帮忙监视伦敦上空的飞机。 Conventional radar uses a rotating antenna to sweep the sky, sending out radio pulses anddetecting those which are reflected back from aircraft. 传统雷达使用旋转天线扫视上空，不断发出射电脉冲并探测被飞行器反射回来的部分。 The experimental system that will begin operation in June does not send out any signals ofits own, 而将于6月份启动的实验系统并不会自己发出任何信号， but instead relies on a network ofreceivers to pick up television programmes. 而是依靠一个接受电视信号的接收器网络。 It is hard to imagine British TV staples like Cash in the Attic, Downton Abbey and endlessrepeats of Top Gear being used to detect aircraft. 很难想象像《家中藏宝》、《唐顿庄园》、《疯狂汽车秀》等这类英国的主打电视节目被用来侦查飞行器。 | 
