On 11/22/2011 07:28 PM, Javier Serrano wrote:
On Tue, Nov 22, 2011 at 3:17 PM, Bob Campli...@rtty.us wrote:
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
On 11/21/11 9:05 PM, Chris Albertson wrote:
You guys missed my point. I did not mean that survey and timing errors are
so large What I meant was that even if you assume unreasonably large
errors (like a surveyor being off by a full meter) you still don't get
60nS.
If I were to bet money,
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
On Tue, Nov 22, 2011 at 3:17 PM, Bob Camp li...@rtty.us wrote:
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 ….
See
Hi
Earth tides and even more un-stoppable events like politics …
Bob
On Nov 22, 2011, at 1:28 PM, Javier Serrano wrote:
On Tue, Nov 22, 2011 at 3:17 PM, Bob Camp li...@rtty.us wrote:
in the first paper, the distance uncertainty was given as 20cm
Of which the survey likely contributed
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
A good friend, who has written a lot of excellent real-time software,
maintains that that it is impossible to find all of the systematic
errors in something as complex as the GPS system. The error is small,
60 ns in 2.4 ms, about 3 E-5, for OPERA or 8 E-5 for MINOS.
Has anyone measured the speed
Hi Bill:
Are they using GPS directly, or to discipline a high quality oscillator, say a Cs? Since it's frequency is spot on then
all the GPS is doing is setting the edge of the 1 PPS. The difference between the Cs 1 PPS and GPS 1 PPS can be
measured over a day or more to see what it looks
Keep in mind that a common view or LOS light method will have a
problem with the variability of the medium density along the path
being unknown.
You could do it in a vacuum however.
I come back to the base question of 'since the speed of light varies
depending on the medium, does the speed of the
On 11/21/2011 08:57 PM, Brooke Clarke wrote:
Hi Bill:
Are they using GPS directly, or to discipline a high quality oscillator,
say a Cs? Since it's frequency is spot on then all the GPS is doing is
setting the edge of the 1 PPS. The difference between the Cs 1 PPS and
GPS 1 PPS can be measured
Has anyone measured the speed of light with GPS clocks in the same way that
neutrinos are measured - say between mountain tops?
I'm pretty sure that won't work very well. The problem is that air isn't
vacuum. The index of refraction changes slightly with temperature.
The subtle changes in
velocity of light versus neutrinos
Has anyone measured the speed of light with GPS clocks in the same way
that
neutrinos are measured - say between mountain tops?
I'm pretty sure that won't work very well. The problem is that air isn't
vacuum. The index of refraction changes slightly
On Mon, Nov 21, 2011 at 4:08 PM, Alan Melia alan.me...@btinternet.com wrote:
You can't measure anything with out perturturbing it in some way, even
slightlythen there is the Uncertainly Principle if they measure the
speed how do they know where they were.
OK, So assume an unlikely
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
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
You guys missed my point. I did not mean that survey and timing errors are
so large What I meant was that even if you assume unreasonably large
errors (like a surveyor being off by a full meter) you still don't get
60nS.
If I were to bet money, still I'd bet on some experimental error. That
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