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| Re: Canarsie CBTC (97724) | |||
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Re: Canarsie CBTC |
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Posted by Stephen Bauman on Sun Jun 12 08:19:10 2005, in response to Re: Canarsie CBTC, posted by Jeff H. on Sat Jun 11 23:50:43 2005. By utilizing sensor diversity, it is possible to overcome the basic unreliability of taking the data from a single axle which is subject to locking up.That's true and I appreciate your analogy with ntp. However, how good do the position estimates have to be. They must be accurate enough so that the trains are guaranteed to be within the station, when the doors are supposed to open. I think this is the tightest requirement. Fortuantely for the Canarsie Line the platforms are the 536 foot BMT standard length. The trains are only 480 feet long and cannot get any longer. There's quite a large margin for error built in there. I'd think that a single sensor with a recalibration at every station would be sufficient to maintain that accuracy. Indeed, if it isn't because of wheel slip, I'd think those wheels would be very flat before long. |
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