On 11/22/2011 03:17 PM, Bob Camp wrote:
On Nov 21, 2011, at 10:57 PM, Jim Lux wrote:
On 11/21/11 5:15 PM, Bob Camp wrote:
Hi
You can have a surveyor come out and locate your gizmo to sub one inch accuracy
for a lot less than a clock trip costs. A one meter ( or 3 ns) error would be
pretty large these days. Both have been demonstrated / proven so often that
they aren't really open to challenge.
The total error is a sum of lots of things. Location and time of day are the
easy stuff...
OK, So assume an unlikely huge position uncertainly of one meter. On top of
that let's assume the surveyor got it wrong too and missed by a full
meter. Both of these added together can only account for about 10%
of what they saw. Light moves across one meter in about 3nS You
need to explain 60nS If the result is because of uncertainty in the
location then the we are talking about 20 meters of position error.
in the first paper, the distance uncertainty was given as 20cm
Of which the survey likely contributed next to nothing and stuff like earth
tides contributed the majority of the error ….
Earth tides account for 2-3 dm of rise, not really contributing much to
the 18 m unaccounted for. Also consider that experiment ran for 3 years.
Cheers,
Magnus
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