[ntp:questions] NTP Performance on WINNT
David J Taylor
david-taylor at blueyonder.not-this-part.nor-this.co.uk.invalid
Mon Jul 20 16:55:22 UTC 2009
Richard B. Gilbert wrote:
> That is what a "site survey" is. The GPS determines its location a
> few hundreds of times over the course of a day and does a "least
> squares" calculation to get a reasonable approximation of your
> latitude and longitude.
> Cellular phone base stations do a more extended site survey, thirty
> days instead of one. This gives them a MORE reasonable
> approximation. When I did my site survey (24 hours) the locations
> plotted a locus about
> 300 feet long in an East-West direction and with a width of about
> thirty feet.
> If I had had the patience and if I had required sub microsecond
> accuracy I could probably have trimmed that locus further. . . . .
> It is enough, for me, that my little herd of computers agree as to
> approximately what time it is.
Thanks, Richard. I took your "You do need to run a "site survey"" as
something rather more involved than letting your GPS just sit there.
For me, a few milliseconds is good enough, but I always want to do
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