Beijing airport's radars get the wrong signal |
文章来源： 文章作者： 发布时间：2007-06-12 01:27 字体： [ 大 中 小] 进入论坛 |
(单词翻译:双击或拖选)
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June 9 - Radar1 at Beijing's airport was subjected to interference from radio-controlled cameras on a building 14 kilometers away, an investigation3 by China top radio watchdog has found.
"Fuzzy signals" affected4 the radars5 for almost a week, potentially putting flight safety at risk.
"The radio waves severely6 disturbed normal flight take off and landings," Su Qing, of Northern China Air Traffic Management Bureau's communication navigation sector7, said.
Three mini-cameras with radio aerials installed in building elevators were responsible for the interference.
Niu Kai, from China's top radio watchdog, said the case has been reported to Radio Management of China, and was also being handled by the Beijing radio management bureau.
Several monitoring stations and mobile monitoring facilities were used to use to track the source of the interfering8 radio waves.
The cameras were located in the Dashanzi area, some 14 kilometers away from the airport, in a dorm building affiliated9 with Panasonic, after a two-day investigation.
"The radio was using the same frequency channel as the airport radar, therefore, largely dampening the performance of the radar," Su told China Daily.
Interfering signals can result inaccurate10 flight traffic data being reported.
Flights are especially susceptible11 during take-off and landing because all frequency bands are working.
Aircraft need clean and clear radio channels.
Power and signal are two decisive factors that determine how strong a radio wave is.
In this case, two buildings blocked the signal from two of the cameras, leaving one camera to interfere2 with the airport's radars.
The radio management regulation, issued in 1993, falls short of describing the "safe distance and area" regarding a radio's affected area, Niu said.
点击  收听单词发音
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1
radar
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| n.雷达，无线电探测器 |
参考例句： |
- They are following the flight of an aircraft by radar.他们正在用雷达追踪一架飞机的飞行。
- Enemy ships were detected on the radar.敌舰的影像已显现在雷达上。
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2
interfere
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| v.(in)干涉，干预；(with)妨碍，打扰 |
参考例句： |
- If we interfere, it may do more harm than good.如果我们干预的话，可能弊多利少。
- When others interfere in the affair,it always makes troubles. 别人一卷入这一事件，棘手的事情就来了。
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3
investigation
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| n.调查，调查研究 |
参考例句： |
- In an investigation,a new fact became known, which told against him.在调查中新发现了一件对他不利的事实。
- He drew the conclusion by building on his own investigation.他根据自己的调查研究作出结论。
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4
affected
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| adj.不自然的，假装的 |
参考例句： |
- She showed an affected interest in our subject.她假装对我们的课题感到兴趣。
- His manners are affected.他的态度不自然。
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5
radars
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| n.雷达( radar的名词复数 )；雷达装置 |
参考例句： |
- Servos for large radars and launchers are either electro-hydraulic or all-electric. 大型雷达和发射装置的伺服系统，不是电动-液压式的，就是全电动式的。 来自辞典例句
- Range-velocity simultaneous pull-off is one of effective measures for countering PD radars. 距离-速度同步拖引干扰是对抗PD雷达的有效方法。 来自互联网
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6
severely
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| adv.严格地；严厉地；非常恶劣地 |
参考例句： |
- He was severely criticized and removed from his post.他受到了严厉的批评并且被撤了职。
- He is severely put down for his careless work.他因工作上的粗心大意而受到了严厉的批评。
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7
sector
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| n.部门，部分；防御地段，防区；扇形 |
参考例句： |
- The export sector will aid the economic recovery. 出口产业将促进经济复苏。
- The enemy have attacked the British sector.敌人已进攻英国防区。
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8
interfering
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| adj. 妨碍的
动词interfere的现在分词 |
参考例句： |
- He's an interfering old busybody! 他老爱管闲事！
- I wish my mother would stop interfering and let me make my own decisions. 我希望我母亲不再干预，让我自己拿主意。
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9
affiliated
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| adj. 附属的, 有关连的 |
参考例句： |
- The hospital is affiliated with the local university. 这家医院附属于当地大学。
- All affiliated members can vote. 所有隶属成员都有投票权。
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10
inaccurate
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| adj.错误的，不正确的，不准确的 |
参考例句： |
- The book is both inaccurate and exaggerated.这本书不但不准确，而且夸大其词。
- She never knows the right time because her watch is inaccurate.她从来不知道准确的时间因为她的表不准。
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11
susceptible
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| adj.过敏的，敏感的；易动感情的，易受感动的 |
参考例句： |
- Children are more susceptible than adults.孩子比成人易受感动。
- We are all susceptible to advertising.我们都易受广告的影响。
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