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 <att...@kinali.ch> wrote: > On Fri, 6 Feb 2015 10:21:08 +0100 > Javier Serrano <javier.serrano.par...@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 > > -- > It is upon moral qualities that a society is ultimately founded. All > the prosperity and technological sophistication in the world is of no > use without that foundation. > -- Miss Matheson, The Diamond Age, Neil Stephenson > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
