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Technology for its own sake?
On Thu, 23 Sep 2004 18:25:33 UTC, "Gavin Hamilton"
wrote: : It's been somewhat better than that for a while, since the "random error" : was removed. IME the error is probably nearer 2 metres. Though the powers : that be can reintroduce the random factor, or turn it off entirely, should : they feel the need. You have to be careful not to confuse the random precison errors with the unrandom accuray ones. Civilian GPS is designed to be precise to about +/- 10m, whereas military GPS, which uses different signals, is precise to +/- 1m. Those errors are random - there is nothing you can do about them. Selective availability was a deliberate degradation of accuracy, done by effectively instructing satellites to tell porkies in their signals, and thereby displace all GPS positions in a particular area by an ordained amount. That's what doesn't happen (much) any more, but the precision errors remain. Ian -- |
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