[time-nuts] GPS jump
jim77742 at gmail.com
Sat Oct 11 08:24:50 EDT 2014
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 <tvb at 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.
> ----- Original Message -----
> From: "Jim Palfreyman" <jim77742 at gmail.com>
> To: "Discussion of precise time and frequency measurement" <
> time-nuts at 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
> > 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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