Re: GPS 'GR Correction' Myth.


sue jahn skrev:
>
> "A man is rich in proportion to the number of things he can do without"
> --Henry David Thoreau
>
> But it is bad new for Rolex and Seiko as more and more
> people learn how to limit their use of a watch to twice per
> day. ;-)

Apropos clocks.

You never answered the following question:

Do you accept that the following is a fact?

| So this proves that the satellite clock really advanced
| 19 us more per orbit (12 hours) than the ground clock did.
| There is nothing apparent about this, and what happens
| to the signal on its way down is irrelevant.

The context was:

The very first GPS satellite was launched with the GR correction
switched off (not possible with later satellites).

<< Clock-driven transmitters send out synchronous time signals,
tagged with the position and time of the transmission event,
. . .
The atomic clock was first operated for about 20 days
to measure its clock rate before turning on the synthesizer.
The frequency measured during that interval was +442.5 parts
in 1012 faster than clocks on the ground; if left uncorrected
this would have resulted in timing errors of about 38,000
nanoseconds per day. The difference between predicted and
measured values of the frequency shift was only 3.97 parts in 1012,
well within the accuracy capabilities of the orbiting clock. >>
http://www.phys.lsu.edu/mog/mog9/node9.html

Note that the frequency was NOT measured from the ground.
The satellite clock transmits the reading of its clock to
the ground regularly. The observer on the ground could then
calculate how much the satellite clock advanced during those
20 days. The frequency difference was then calculated by
comparisom with the ground clock.
This proves that the satellite clock really advanced
19 us more per orbit (12 hours) than the ground clock did.
There is nothing apparent about this, and what happens
to the signal on its way down is irrelevant.

Spell it out.
Do you accept this as a fact, or do you ignore
this experimental verification?

Paul

.

Relevant Pages

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