On Aug 21, 3:21*am, Poutnik wrote:
In article 71154e1f-8741-4295-a871-f7dd7616a521
@a8g2000pro.googlegroups.com, says...



Nonsense. *Initially, self-styled physicists had laid out a system
that suggested relativistic correction if existed, but engineers had
outsmarted these idiots and came up with a system that does not
require relativistic correction if existed. *shrug

Do not screw the history, it is quite the opposite.
The correction was not done initially,
but later these smart engineers realized there is need to introduce it.
It does not matter in what part on system it is done.



Not quite. Scientists (of course) knew the correction would be
needed,
but some engineers doubted it, so the first satellite had the ability
to *toggle* the (major) correction on and off. It was initially
operated
for 20 days without it, the predicted shift was observed, and then it
was turned on and left on:
http://www.phys.lsu.edu/mog/mog9/node9.html

Ashby makes a rather unfortunate statement in the paper. Because
the clocks are now synchronized with ground clocks fairly frequently,
he says the GPS system "can no longer be used to test general
relativity". This is often misinterpreted to mean that the
relativistic
corrections are not important. They are. The statement simply means
that because the system if frequently synchronized, it cannot improve
on the
tests which were initially done.

-jc



In a more thorough analysis, any relativistic correction is basically
resetting a counter. *It is merely a software solution and Mr. Wilson
had pointed out. *You can fly with cheap oscillations driving your
chronological time if you can devise clever ways to synchronize all
the satellite chronological time. *System similar to IEEE1588 or NTP
should easily suffice, and it is still a software solution. *shrug

We do not need any analysis to tell you
time correction is just simple HW or SW based operation.

One thing is how
other thing is why
and yet other thing is how much.

BTW NTP is far way innacurate to serve GPS needs.



Position correction is a statistical issue. *Relativistic error is a
few hundred parts per trillion. *Just how would that affect the
positions of each satellite when each is moving at much lower speed
than the speed of light? *shrug

If you have troubles in counting
how far the satellite moves during 38 * n microseconds,
where n is number of days since last relativistic correction,
we can help you.

--
Poutnik

People, who do not know the manners,
are ignored without notice.