On Thu, 21 Feb 2008 22:37:43 +0100, "Paul B. Andersen"
wrote:

Dr. Henri Wilson wrote:
Paul, let's try a little harder.

Let's say that after launch, an OC is found to emit 100000000000001 ticks for
every 100000000000000 ticks of the GC.

How would a Norwegian go about software synching the OC with the GC?

I eagerly await your answer.

Still don't know after all these years, Henri? :-)

1. The SV-clock is never adjusted while a satellite is in service,
the "clock data" are transmitted with no correction.
2. The "clock offset" tells what the error in the "clock data" is,
and is transmitted together with the "clock data".
3. The correction is done in the receiver, it will find the correct
time reported by the satellite by subtracting these two times.
4. The "clock offset" is updated (uploaded from the ground) typically
once per day.



If there is anything else you still don't know, just ask.


Remember to include GR....

Done prior to launch.
That's why the rate of the orbiting clock is correct to one part in 10^14.
Had you forgotten that the GPS wouldn't work without the GR correction?



Henri Wilson. ASTC,BSc,DSc(T)
www.users.bigpond.com/hewn/index.htm

Einstein's Relativity is easy to understand if one has the IQ of a parrot and a gullibility index 0.95.