In sci.physics, Sue...

wrote
on 6 Aug 2005 13:29:48 -0700
. com:

The Ghost In The Machine wrote:
In sci.physics.relativity, sue jahn

wrote
on Sat, 6 Aug 2005 13:31:37 -0400
:

"Sue..." wrote in message oups.com...

http://news.google.com/news?sa=N&tab=gn
PRN MID PASS BGTK TRK MC-GPS SLOPE RMS SAMP EL AZM ION MC-SATCL SLOPE TROP
MJD HHMM SEC NS PS/S NS N DG DEG NS NS PS/S NS
3 53587.02535 0030 780 -2.5 -5.3 1.7 52 36.6 50.4 10.1 -23330.1 -2.0 13.7

[rest snipped]

Erm... you wouldn't mind indicating where you got that data, would you?
;-) I can't say the columns are all that obvious in its posted form.
Oops Sorry

GPS SYSTEM TIME
GPS system time is given by its Composite Clock (CC). The CC or "paper"
clock consists of all operational Monitor Station and satellite
frequency standards. GPS system time, in turn, is referenced to the
Master Clock (MC) at the USNO and steered to UTC(USNO) from which
system time will not deviate by more than one microsecond. The exact
difference is contained in the navigation message in the form of two
constants, A0 and A1, giving the time difference and rate of system
time against UTC(USNO,MC). UTC(USNO) itself is kept very close to the
international benchmark UTC as maintained by the BIPM, and the exact
difference, USNO vs. BIPM is available in near real time.
The latest individual satellite measurements are updated daily. (Data
format explanation.)

The best current measure of the difference, UTC(USNO MC) - GPS is based
on filtered and smoothed data over the past two days.
http://tycho.usno.navy.mil/gpsinfo.html#tt

Yes, that'll do nicely, thank you. I'll have to look at it and
see how close it gets to the theoretical computations done in
various places -- the logical start point being someplace like

http://relativity.livingreviews.org/...es/lrr-2003-1/ .

I might also have a copy of Hafele-Keating floating around here
in my computer system somewhere.


Sue...


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#191,
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