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| Re: Canarsie CBTC (100336) | |||
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Re: Canarsie CBTC |
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Posted by Stephen Bauman on Sat Jun 18 11:11:06 2005, in response to Re: Canarsie CBTC, posted by AlM on Sat Jun 18 10:38:24 2005. Depends how rapidly the error can change with time. If each error is totally independent of the preivous error, then of course 15' is too much. If each error of position is very closely correlated in magnitude and direction with the prior error, then it would be possible to get extremely accurate measurements of velocity.You must make the assumption that the errors are statistically independent. The fact that the position reading on a stationary GPS receiver does not vary means only that successive readings are repeatable. That's not necessarily a bad thing, if the application is to find the same spot over and over again. Repeatability and accuracy are two different animals. You need accuracy to compare successive readings from two different locations. |
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