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Re: Canarsie CBTC

Posted by RonInBayside on Sat Jun 18 11:41:57 2005, in response to Re: Canarsie CBTC, posted by Stephen Bauman on Sat Jun 18 11:25:55 2005.

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I would venture to say the error would be +/- 23 feet per second at a velocity of 73 feet per second. That is what you really want, is it not?

But AIM pointed out my error in assuming that this error rate is cumulative. I compared it in an earlier post to an inertial reference system, where error is cumulative. AIM pointed out that GPS readings are inependent of each other and therefore the error is not additive. (Thank you, Al.) I also noted your objection to AIM's explanation, but I do not fully agree with it. Yes, repeatability is there; but if your measurements are independent of one another, and not dependent on the previous measurement, then that will tend to limit your total error.

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