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Re: Canarsie CBTC

Posted by RonInBayside on Sat Jun 18 08:59:04 2005, in response to Re: Canarsie CBTC, posted by Stephen Bauman on Sat Jun 18 08:50:47 2005.

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"You need to update position and velocity data at least once per second."

Agreed that this is a reasonable requirement.

"Does GPS give you position data that frequently?"

That's probably the upper-limit of what can be done currently - which is why I would also stipulate to GPS' being a subject of research for transit applications.

Other posters have pointed to its usefulness when trains are further apart on larger geographic areas. (Freight trains)

If we move from transit and go to commuter railroads with say 15 minute- to half hour intervals, we might see a point where GPS could be used. Defining the current boundary of its application is useful. Over time, that boundary will change.


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