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| Re: Canarsie CBTC (100187) | |||
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Re: Canarsie CBTC |
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Posted by tracksionmotor on Sat Jun 18 00:07:29 2005, in response to Re: Canarsie CBTC, posted by RonInBayside on Fri Jun 17 17:57:55 2005. Geosynchronus Position Satellite requires a 'view' to at least sixsatellites. It will work quite nicely...at the earths surface. It will work with CBTC but the 'capture time' is excessive for what a short range rail system NYCTA uses. GPS is good for the long haul mainline trakkers because they don't have short signal zoning. CBTC requires instant comm at every comm zone...the system recognises trainset has entered what was formerly a 'signal rail zone' with the trainsets ID. System cannot wait for trainset to obtain GPS coordinates...just see how long your GPS hand-held takes to obtain accurate coordinates. Trainset cannot obtain GPS coordinates underground. CI peter |
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