Alan wrote:
An interesting point re 3 use-cases and re the vast majority of
commercial algorithms being made for telco purposes. Does that imply
that 10MHz lab-instrument feed for frequency / timing etc would
ideally have some different algorithms?
Frankly, I see no need for a lab standard
Hi
On Apr 14, 2015, at 12:05 PM, Alan Ambrose alan.ambr...@anagram.net wrote:
Hi all,
Thanks for the interesting feedback everyone, and thanks Attila, for your
specific references - some reading ahead.
In principle, I should be able to remember all the stochastic / standard
control
Hi all,
Thanks for the interesting feedback everyone, and thanks Attila, for your
specific references - some reading ahead.
In principle, I should be able to remember all the stochastic / standard
control theory, but I'm sure I'll have to 're-remember' it.
An interesting point re 3 use-cases
csteinm...@yandex.com said:
There are two regimes a GPSDO must deal with -- normal operation, and
holdover.
Is there a 3rd regime: Recovery from holdover?
How many GPSDOs even spec what they do in that area? They may do it
indirectly by reference to Telco spec . What do the
Hi
To add a bit to the “mind numbing details” list:
The main market for GPSDO’s has traditionally been cell sites. Essential all of
the GPSDO’s
that one sees on eBay these days originally went into one or another aspect of
a cell site or
radio system. The need there is for a rated level of
I think a GPSDO is different from GPS disciplining. In a GPSDO you
are disciplining a local oscillator, not a GPS system.
Algorithms used to discipline oscillators are also used and were
developed for other uses. For example it is common to use a PID to
discipline a local oscillator. The PID
On Mon, 13 Apr 2015 13:03:36 +
Alan Ambrose alan.ambr...@anagram.net wrote:
I'm interested in GPSDO disciplining algorithms - presumably the good ones
are really well thought out stochastic control algorithms.
Is it possible to point me to the seminal references / papers / datasheets
Hi
That paper is addressing the task of keeping the cesium standards in the GPS
satellites on frequency. With the exception of a couple Ham designs, most
GPSDO’s
are done commercial. The algorithms used are mostly proprietary. That’s not to
say that they don’t use common control approaches
See especially Appendix A here:
http://www.jackson-labs.com/assets/uploads/main/HP_AppNote.pdf
The HP goal was specifically to meet telco 48-hour holdover specs. Others
here have had vastly different concepts of holdover length (sometimes just
seconds!)
Tim N3QE
On Mon, Apr 13, 2015 at 9:03 AM,
Alan wrote:
I'm interested in GPSDO disciplining algorithms - presumably the
good ones are really well thought out stochastic control algorithms.
There are two regimes a GPSDO must deal with -- normal operation, and holdover.
There is not a whole lot of mystery about normal, locked
Hi all,
I'm interested in GPSDO disciplining algorithms - presumably the good ones are
really well thought out stochastic control algorithms.
Is it possible to point me to the seminal references / papers / datasheets that
describe typical algorithms and the advantages and disadvantages of the
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