Hi Tobias,
Using the excellent material found here:
https://nbviewer.ipython.org/github/rlabbe/Kalman-and-Bayesian-Filters-in-Python/blob/master/table_of_contents.ipynb
I went ahead and implemented the first order filter as described in
chapter 8.
The simulation was changed to use a real
Time machines makes a similar box.
However, one would expect that with that many devices at a site one could
find a couple of devices which could run a ntp server along with their
normal workload.
On Thu, Apr 21, 2022, 2:23 AM Paul Watts wrote:
> Long time lurker, first time poster.
>
> In the
Hello Matthias,
> Of course curiosity got the better of me. I switched the GPSDO to hold-over
> and recorded about 4000 seconds of data. Result is attached. BTW I terminated
> the experiment after the temperature compensation kicked the DAC one LSB
> down.
> I am quite pleased with the
Kalman filters are optimal only if they work with statistical processes
that can be described with derivatives or integrals, i.e. white phase noise
(f^0), white FM (f^-2), random walk FM (f^-4) and so on.
Most of VCOs are heavily flicker FM dominated
Il giorno gio 21 apr 2022 alle ore 19:09 Erik
Hi Attila,
I will attend the EFTF/IFCS in Paris together with the AXTAL Chief Engineer
Henry.
We will arrive Monday afternoon and will leave on Thursday at noon.
Will be glad to meet you both!
Best regards
Bernd
-Ursprüngliche Nachricht-
Von: Attila Kinali [mailto:att...@kinali.ch]
Hi Erik,
when I familiarized myself with the topic back in 2018, I found this paper:
https://ieeexplore.ieee.org/document/7324685 (IEEE paywall)
https://www.researchgate.net/publication/308730123_Synchronization_robustness_using_Kalman-based_clock_servos
They found that Kalman filters and PI
I have yet to find a reliable source for this, but something I have heard in
the past is
that since the different constellations' satellites may be controlled and
disciplined
differently (and to different standards), it is not wise to use more than one
constellation
on receiver that is used to
On Dienstag, 12. April 2022 00:52:42 CEST Magnus Danielson via time-nuts
wrote:
> A trivial state-space Kalman would have phase and frequency. Assuming
> you can estimate the phase and frequency noise of both the incoming
> signal and the steered oscillator, it's a trivial exercise. It's
>
Private email from the folks at NRCan indicated that having both constellations
in the data would potentially result in (more) clock offset jumps in the PPP
results. Remember that GLONASS and GPS are synced to different master clocks
which are some small (and potentially variable) number of
On Donnerstag, 21. April 2022 13:48:42 CEST Markus Kleinhenz via time-nuts
wrote:
> Hello Matthias,
>
> Could you explain further how enabled GLONASS messed things up for you?
Noticeably more transients in the phase error. Phase jumps of 15ns or more.
Since then I only enable GPS and Galileo,
Thanks for the reply, Forrest.
I do have a TM1000(model number?) but I thought they were out of stock.
Their website currently claims otherwise and I'll probably get another.
I do have systems at each site running NTP against my local LeoNTP devices
and the US NTP pool.
I just like to have a
25 years ago Brooks Shera developed a GPSDO that had a Frequency accuracy of 1
E-11. A year later in 1998 he published his work in July 11998 in QST. The
total package included circuits, PC board and in depth analysis of every part
of his design including his filter.. I was one of the first
Though I don't have a Time Machines NTP server I've monitored them for
several years and have seen a number of "off by N-seconds" errors.
The manufacturer reproduced the problem and released new firmware for the
TM2000B. I don't know the status of other models.
I would be hesitant to trust the
Long time lurker, first time poster.
In the past, I've purchased the LeoNTP server to act as a local time server
on my work network. Unfortunately, those NTP servers aren't available to
order.
I'm in need of two - three more NTP servers for various locations.
Do any of you have an alternate NTP
Hi Attila and Markus,
I wobei at the Symposium in Paris together with our Chief Engineer
Henry. We will arrive on Monday afternoon and will leave Thursday at
noon time.
Will be glad to meet you both - and more folks.
Best regards
Bernd
sent by Mobile phone
Am 20.04.2022
Hi Erik,
yes I also found this webpage, and the examples are good.
I had the exact same idea as you, except I thought that the model for the
VCO output is either phase only or phase and frequency. Yours is even a bit
more sophisticated, thats quite cool!
And yes, of course it will be possible to
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