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the GPS myth almost mythbusted



 
 
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Old August 21st 11, 08:58 AM posted to sci.physics.relativity,sci.physics,sci.math,sci.astro
Koobee Wublee
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Posts: 815
Default the GPS myth almost mythbusted

On Aug 20, 7:37 am, Jerry wrote:
On Aug 20, 8:30 am, Poutnik wrote:


Satellites do not, but the whole system do.


Correct.


Bull****. shrug

It is quite amazing how crackpots distort everything that they
read.


What are you babbling about? shrug

The complete story of why relativistic corrections are needed in
GPS is rather long. You need to understand that GPS comprises
a Space Segment, a Control Segment, and a User Segment.


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

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

http://en.wikipedia.org/wiki/IEEE158...ynchronization

[snipped unrelated garbage to make Jerry the **** head looks like
someone who knew what it is talking about]

Among other functions, these ground stations closely monitor the
positions of the satellites, and the master control station sends
updated ephemerides information to the satellites as they pass
over the large ground-antenna stations.


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

In order to perform their function, THESE GROUND STATIONS NEED
PRECISE TIME. How do they set their clocks? Through the GPS
itself.


Bull****! Show analysis. shrug

The ability to distribute precise time is an absolutely essential
aspect of the GPS system, since without precise time, the earth-
based control stations that monitor the satellites' positions and
establish "ground truth" for the system cannot perform their
function.


The requirement in precision timing of the chronological time applies
to only the orbiting satellites and no one else. shrug Show your
analysis otherwise. shrug

Unless the satellites' clocks are synchronized with ground clocks
via the GR correction, there is simply no feasible way for them
to distribute time around the globe.


This is an absolute myth. Well, He has had enough with these
bull****s from someone who does not even understand Snell’s law. Your
pillar of support who has been 24/7 in its vigilance in spreading lies
and bull**** (namely Paul Draper, PD, an ex-professor of physics) had
choked on that high-school level physics. You have absolutely no
credibility. shrug

[rest of cyber diarrhea snipped]

So, **** off. shrug
 




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