Thanks for all the info on PLL types. [ snip ] > If you do Kalman filtering, it will change the tau as it learns the errors and > will perform better than any PLL since it will effectively adjust the tau to > the situation rather than some engineering decission had it a few years back.
Is there a readable reference on Kalman filtering that doesn't require a PhD in math? > If you do fancy PLL stuff, you can aid the PLL tracking with external sensors, > so that temperature measurements, accelerometers etc. can be used to feed > correction signals such that the PLL loop does not have to track it all in > by itself. The gain of such a solution is that a wider range of PLL parameters > may be chosen. I've seen OCXO with attached accelerometers - but was told that they did not feed back into the PLL in the expected way; instead if a jolt was detected it would simply quickly shorten the PLL time constant for a while. I suppose the same could be done to detect high slew rates in temperature. > So, there is alot more to do then just to "lock it up". The performance you get > certainly can be improved as a result. > > Cheers, > Magnus Thanks again for a great posting. /tvb _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
