[time-nuts] Good references on holdover?

[Javier Serrano]

This is a great list. Thanks everyone! Much of the material relates to
cases where good holdover needs to be maintained for several hours,
but there's a lot of insight to be gained from the reading, and I am
sure those techniques will come in handy for other projects. Thanks
again!

Javier

On Fri, Feb 6, 2015 at 2:58 PM, Attila Kinali <attila at kinali.ch> wrote:
> On Fri, 6 Feb 2015 10:21:08 +0100
> Javier Serrano <javier.serrano.pareja at gmail.com> wrote:
>
>> We would like to start working on holdover performance for White
>> Rabbit [1]. This is a new domain for us. Our main use case is a WR
>> switch losing its reference because someone disconnects a fiber. We
>> can have redundancy, but it will take some time for a switch to change
>> over to another reference. During this time, the oscillator in that
>> switch will be free-running. We want to minimize the phase drift
>> during that interval, which we think should be a couple of seconds
>> maximum. We have never worked on holdover, and I am wondering if we
>> can do something smarter than the obvious feeding of some constant
>> voltage to the VCXO, based on averaging during the locked state. Does
>> anybody know of any good references on holdover?
>
> I think you are looking for something like [1]. I think [2] could be also
> of help, although it's not as good as the Nicholls paper. Zhou's paper [3]
> seems to be very similar to what Nicholls did (i have not fully read it yet).
>
> HTH
>
>                         Attila Kinali
>
>
>
> [1] "Adaptive OXCO Drift Correction Algorithm", by Nicholls and Carlton, 2004
> http://dx.doi.org/10.1109/FREQ.2004.1418510
>
> [2] "A Frequency Model for OCXO for Holdover Mode of DP-PLL",
> by Hwang, Shin, Han, Kim, 2000
> http://dx.doi.org/10.1109/SICE.2000.889649
>
> [3] "Adaptive Correction Method for an OCXO and Investagion of Analytical
> Cummulative Time Eror Upperbound", by Zhou, Kunz, Schwartz, 2011
> http://www.sce.carleton.ca/faculty/schwartz/abstracts/HuiPaperschwartz.pdf
>
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