Are you referring to Kalman filtering/steering? Yes, it depends on how accurate is the model of the oscillator (and the dimensions of the Kalman filter) but it can work for several hours not indefinitely.
On 10/13/11, Chuck Harris <[email protected]> wrote: > Because the aging of oscillators is sufficiently random that it defies > prediction over the long term. Austron, and others, have made disciplined > oscillators that calculated the aging rate relative to a stable source, > and applied that correction to the oscillator's EFC if the stable source > went away... It works for several hours at most before the stubborn little > oscillator, and the aging model diverge. > > -Chuck Harris > > Perry Sandeen wrote: >> List, >> >> Wrote: I wonder how long it will be before the only remaining basket of >> will >> suffer a catastrophic fall. >> >> The U.S. satellite system, AFAIK, is not guaranteed for high accuracy to >> civilians >> and also is vulnerable to foreign interference/destruction. >> >> Perhaps while we have it as it is now, it might be prudent to accurately >> track the >> EFC voltage over time that one needs to maintain a particular oscillator >> to it >> maximum stability. >> >> Then make an independent oscillator and divider chain that will cycle a >> digital >> potentiometer taps or perhaps a DAC to automatically maintain the rate-of >> - change >> needed to keep said oscillator at maximum stability. >> >> Doing this now with at least one or two oscillators and then comparing to >> a GPS >> derived frequency and least gives one a “belt and suspender” back-up. >> >> High quality 10 MHz oscillators are available all day on epay for less >> than $50. >> Or one could splurge on a HP 10811 or Rubidium for less than $100. >> >> Just food for thought. >> >> Regards, >> >> Perrier >> >> >> >> >> >> _______________________________________________ time-nuts mailing list -- >> [email protected] To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the >> instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
