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| Re: Canarsie CBTC (100108) | |||
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Re: Canarsie CBTC |
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Posted by Stephen Bauman on Fri Jun 17 19:52:12 2005, in response to Re: Canarsie CBTC, posted by RonInBayside on Fri Jun 17 17:57:55 2005. you were correct in that if you had two trains adjacemnt to each other, GPS' accuracy would be insufficient to keep them separated for purposes of say, switching tracks and so on.CBTC does not handle switching. But youcould use it to keep trains separated on the same track. Your software would have to compensate for the error, though. The software has to get the following information from the train: position, speed and which track it is on. Just how will the train supply this information to the software? Also, the software wants the position data as some distance along the track from some reference point. The GPS data is latitude, longitude and altitude. A complete track map including curves and grades is necessary to convert between the two. Additional calculations, even if some wayside beacon were to tell the train which track it were on. I am not aware of GPS-supported CBTC systems in operation today. Ever wonder why? I would support an experimental trial of a GPS supported CBTC system on a test track somewhere, to demonstrate its potential and its limitations. How much of your own money will you put up, for the test? |
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