The Correlation Estimator Block works fine for my purposes, giving a phase_est that I use to correct the frequency offset. What I’m finding (and this should not be part of this list I know), is the usual problem with a multi-radio, packet-based system.

I was thinking that isotope dating could get you in the neighborhood, where you could fine tune the estimate with pulsar phase relationships -- if you could locate the pulsars and predict their behavior at that time.

We did this over six months, but when confronted, AEP claimed it was due to estimation, but the so-called reading was different from ours on each bill, and an estimation is supposed to be no longer than three months, or they told us.

The confidence of those parameters will give you the confidence interval for it's estimated behavor, just as the confidence interval for the ADEV will be needed. So, what was your engineering question, really? Cheers, Magnus

But because of the conservative estimate it might 150 times to small to measure. So randomly delayed reads of the ADC will not matter. That said I'm sure we can do 100X better then the 63 uS estimate. On the other side, charging the cap. Let's say I mis-measured a wire and it is 1cm longer then I though.

Some oscillator datasheets specify Allan deviation values, but I guess what I need for estimating worst case timestamp error during holdover periods are actually MTIE values. Is there any way to estimate the latter from Allan deviations specs? Would an ADev of 65 x 10^-9 over 100s imply up to 6.5us of error after 100s? Any thoughts?

The analysis of Omega-counters (those using linear regression for frequency estimation) triggered the discovery of the PDEV measure. However, there you use m-altering weighing rather than the typical fixed width filtering of delta and omega counters.

As was discussed before, bandpass filtering and > more advanced phase estimation are complementary in their results: with > ideal band pass filtering, the phase detection becomes much less critical > (and vice versa).

Of course, the more datapoints I have, the more accurate that estimation might be. Then I could use that to project into the future to see when it will likely drift out of spec.

From several areas of the plot, we can estimate a short-term change of about 75 uV/C, corresponding to a tempco of about 27 ppt/C for the OCXO. Again, not too bad. The control loop time constant was set to 300 seconds. For best frequency performance with this unit, one could set it longer.