Re: Motion Through Space Is Meaningful

2ndPostulateDude wrote: 
Sam Wormley
Newsgroups: sci.physics
From: Sam Wormley <sworml...@xxxxxxxxx>
Date: Wed, 31 Aug 2005
Subject: Re: Motion Through Space Is Meaningful

2ndPostulateDude wrote:

Dirk Van de moortel wrote:
  [something about his family, I presume]
Dirk and Sam should consider the following:
In order for any SR prediction is to be useful to
physics, it must be based upon the use of valid
experimental equipment; however, no one has proved
that SR's clocks are (1) correctly related temporally,
or (2) not physically slowed, and no one has proved
that SR's rulers are not physically contracted.



   Dude should purchase a Global Positioning System receiver,
   enter in the coordinates of the local particle accelerator,
   and use the GPSR to get himself there. SR in action!

Are you claiming that the GPS clocks are absolutely synchronous?
If so, then tell us how that came to be.


  No--The clocks are separated. GPS does, however, currently make
  us of a dozen relativistic corrections to help attain the
  accuracy that it enjoys.



Einstein claims that we cannot have absolute time, so absolute
synchronization in GPS would contradict, not support, SR.


  That is correct, no absolute time, no absolute synchronization.


The GPS does not need absolute synchronization because it uses
geometrical corrections.

WEB REF.:
"That's the idea behind differential GPS: We have one receiver
measure the timing errors and then provide correction information
to the other receivers that are roving around. That way virtually
all errors can be eliminated from the system, even the pesky
Selective Availability error that the DoD puts in on purpose."
                http://www.trimble.com/gps/


  This is, in general correct, however Selective Availability was
  done away with by Bill Clinton... Where have you been?

  Back to the subject at hand. There has *never* been a prediction
  of Special Relativity that was contradicted by an observation.
  *Never*.  Many predictions of Special Relativity are demonstrated
  in particle accelerators and the Global Positioning System...
  Absolute synchronization is *not* a prediction!

.

Relevant Pages

  • Re: DGPS standards? Pleaseeeeeeeee Help
    ... It is a form of DGPS but it does not broadcast corrections like ... If you are actually implementing a receiver rather than using a kit from ... We are a team of 5 engineers involved in GPS development from Scratch. ... Some more doubts regarding RTK. ...
    (sci.geo.satellite-nav)
  • Re: List of Cranks here
    ... >> signal to reach the receiver due to multi paths ... >> so GPS receivers are programmed to compute out the ... >> The Military can play games with the GPS signals by ... > There are a dozen relativistic corrections incorporated in GPS ...
    (sci.physics)
  • Re: GPS indulgence about GR
    ... Why would GPS need relativistic corrections?. ... computations in the receiver device. ... orbital clocks, trying to synchronize them. ...
    (sci.physics.relativity)
  • Re: Source(s) of GPS error
    ... Differential correction sources include user provided reference stations, community base stations, governmental beacon transmissions, FM sub-carrier transmissions and geosynchronous satellite transmissions. ... UEE includes receiver noise, multipath, antenna ... Troposphere--Errors in the corrections of pseudorange caused by tropospheric effects ... These errors were closely correlated with the satellite clock, ...
    (sci.geo.satellite-nav)
  • Re: Google please assign this group a moderator
    ... GPS, etc. apply relativity. ... GPS must use relativistic corrections or it ... basic idea is to use the Moon as a clock. ... ONLY a few Einstein Dingleberries ...
    (sci.physics)