Bruce, 2009/4/9 Bruce Griffiths <[email protected]>: >> Doesn't that imply that the data point should correspond to the whole >> sampling period and not just half of it? >> >> > The total measurement time is only deceased by 1 sec at the most if you > delete every second line. > The resampled data now has a sampling interval of 2 sec for the entire > measurment time. > > The original data samples are phase differences measured on the second > every second. > The resampled data are phase differences measured every 2 seconds on the > corresponding second transition.
OK, I'm ready to be shot down on this but from what I can see right now the measurement period of 2 sec should be maintained to satisfy the measurement of drift which would otherwise be incorrectly interpreted if I processed 400000 sec of data as only 200000 sec. I can see that noise on the data can be broken down into two major groups, drift and what I would really see as noise, IE PN, flicker, random, etc. I guess I have been ignoring the whole drift component with my missing data used for the ADEV plots. The point to me though is that, even with the reduced data, an ADEV plot should be able to characterise 'noise' for the actual sampling duration of the data, IE. 1 sec. What would obviously be incorrect is the affects of drift which should logically show up as being twice as great. Maybe my idea of using the 1 sec sampling period would work out better with HDEV. 73, Steve -- Steve Rooke - ZL3TUV & G8KVD & JAKDTTNW Omnium finis imminet _______________________________________________ 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.
