To me it doesn't look like a real jump but rather a result of aggregated
systematics. I think it is related to satellite orbits and how they
provide number of birds or lack of good symmetry, or both.
Both september 28th and 29th have equivalently large jumps as october 9th.
Cheers,
Magnus
On 10/11/2014 02:24 PM, Jim Palfreyman wrote:
http://users.on.net/~cdadsl/
Is a web page with all our different sites on it.
Hobart 26m seems to be the only exception but I did make an adjustment on
that day. But the adjustment didn't appear.
All sites are collected and analysed separately with their own GPS clock.
Some are old TACs and most are CNS mark II.
It could be a fluke, but it does seem weird. And as was pointed out - this
happened last year at around the same time. Well spotted Mike Cook!
On 11 October 2014 09:54, Tom Van Baak <t...@leapsecond.com> wrote:
Hi Jim,
Can you tell me more about your configuration? What GPS receiver / antenna
system do you use; L1 or L1/L2? Is this live 1PPS data, or post-processed
from RINEX, etc. Is the data analysis done separately in 5 locations or is
the raw data collected and processed together.
Through IGS and NASA and BIPM there's GPS and maser data from all over the
world so it should be possible to track this down. I can ask people I know
too. But can you clarify how much the "downward turn" is? Is that ps/day,
or ns/day, or what.
Thanks,
/tvb
----- Original Message -----
From: "Jim Palfreyman" <jim77...@gmail.com>
To: "Discussion of precise time and frequency measurement" <
time-nuts@febo.com>
Sent: Thursday, October 09, 2014 4:43 PM
Subject: [time-nuts] GPS jump
Folks,
We look after 5 separate hydrogen masers spread all over Australia and we
collect tic phases between the masers and the GPS.
On around ~Oct 7 we have noticed that the normal steady straight line
(with
standard daily noise) took a noticeable downward turn - on all 5 masers.
Did anyone else who tracks H-masers notice this as well?
Is it JPL making corrections?
Jim Palfreyman
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