Wednesday, 31 March 2010

Anti-Speed Camera Device

Last week a colleague and I headed up to Windermere in the English Lake District to do some fieldwork for a paper we're busily scribbling away at. Despite it being March and the weather being a touch questionable, it was, none-the-less, extremely beautiful:

Anyway, during the long (6 hour) drive we (as generally happens during long drives on British roads these days) touched upon the subject of speed cameras, bane of the motorist. Now, before I begin, let me just be clear, I'm not a raving loony (well, depends on who you ask I suppose) who wants to go tearing round the countryside at 100 miles an hour. It does, however, nark me when we go through miles of road works with 50 mph average speed cameras and see not a single soul working on them.

We mumbled away about how easy it would be to make an anti-speed camera device, in the end coming to a quite surprising solution. Our thought process was basically this:

Speed cameras work using the Doppler Effect; by looking at the apparent frequency shift of a known pulse after it has been reflected off the moving vehicle (see below). In order to prevent said speed camera from catching you, you require some way of scrambling or cancelling this reflected signal. The optimal way of doing this is to emit a phase inverted (upside down) version of this reflected signal. Now, the signal being reflected back to the speed camera is itself the phase inverted version of the original signal emitted by the speed camera as a result of the reflection process.So, the easiest way of making yourself an anti-speed camera device is to steal a speed camera and mount it (discretely, of course) on your car...

36 comments:

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As a man sows, so he shall reap. ....................................................

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佩昭彥怡 said...

成功可招引朋友,挫敗可考驗朋友......................................................

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how do u do?

原秋 said...

人必須心懷希望,才會活的快樂,日子才過得充實,有意義,有朝氣,有信心。........................................

季洪雅 said...

只用微笑說話的人,才能擔當重任。........................................

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沒有目標而生活,恰如沒有羅盤而航行......................................................

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桂竹 said...

幸福不是一切,人還有責任。..................................................

皇雅婷豪 said...

今天是人生唯一生存的時間。 ............................................................

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靖福 said...

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張盈 said...

嘿,你的部落格不錯耶~~只是想跟您問聲好!! .................................................................

陳隆 said...

河水永遠是相同的,可是每一剎那又都是新的。......................................................................

郁雨郁雨 said...

喜歡你的部落格,留言請您繼續加油.................................................................                           

麗珠麗珠麗珠 said...

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如果成為一支火柴,也要點亮一個短暫的宇宙;如果是一隻烏鴉,也要叫疼閉塞的耳膜。.................................................................

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精彩的部落格 要繼續加油 ..................................................................

楊偉馨楊偉馨 said...

Prevention is better than cure.............................................................

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良言一句三冬暖,惡語傷人六月寒。......................................................................

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Learning makes life sweet.

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偉曹琬 said...

最敏捷的,未必贏得競賽:最強大的,未必贏得戰爭:時間與機會才是主人................................................

立和辛和胡辛和辛偉 said...

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tongtong said...

It is no use crying over spilt milk.......................................................................

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