Date: Jan 13, 2013 6:27 PM
Author: Sam Wormley
Subject: Re: special relativity's second postulate is invalid
On 1/13/13 4:36 PM, Koobee Wublee wrote:
> Let?s enjoy the following play between Tom and a GPS satellite.
> Hopefully, the self-styled physicists would begin to understand why GR
> is not necessary in designing the GPS.
Koobee, Work through this resource for an understanding of why
relativity is necessary for GPS to work.
> Reminder: Relativity in the Global Positioning System
>> Article Abstract
>> The Global Positioning System (GPS) uses accurate, stable atomic
>> clocks in satellites and on the ground to provide world-wide position
>> and time determination. These clocks have gravitational and motional
>> frequency shifts which are so large that, without carefully accounting
>> for numerous relativistic effects, the system would not work. This
>> paper discusses the conceptual basis, founded on special and general
>> relativity, for navigation using GPS. Relativistic principles and
>> effects which must be considered include the constancy of the speed of
>> light, the equivalence principle, the Sagnac effect, time dilation,
>> gravitational frequency shifts, and relativity of synchronization.
>> Experimental tests of relativity obtained with a GPS receiver aboard
>> the TOPEX/POSEIDON satellite will be discussed. Recently frequency
>> jumps arising from satellite orbit adjustments have been identified as
>> relativistic effects. These will be explained and some interesting
>> applications of GPS will be discussed.