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| Re: Canarsie CBTC (100290) | |||
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Re: Canarsie CBTC |
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Posted by AlM on Sat Jun 18 08:54:29 2005, in response to Re: Canarsie CBTC, posted by RonInBayside on Sat Jun 18 08:39:18 2005. "Refer to the top of this post."OK, so we're only talking about above ground. By the way, when the military was insisting that GPS signals be randomized, the amount was much more than 20 meters. I think it was 200 feet. However, I would agree that for pure above-ground travel, it is not intrinsically impossible that you could measure velocity with sufficient accuracy using GPS. In particular, whatever errors occur are likely not to vary rapidly with time, so two successive measurements of position are likely to have similar errors in both magnitude and direction. Still, I SUSPECT it's not possible to measure velocity accurately enough, based on anecdotal evidence, but certainly can't prove it. |
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