> In my quest to keep improving my GPSDO, a simple test tool > that I find indispensable is a GPS 1PPS (or 100Hz) signal simulator > reference. Others may also find this useful because it allows testing the > PLL & DO in their GPSDO to Cs type accuracy using a standard OCXO.
Warren, There's been some discussion about a GPS simulator for the purpose of playing with GPSDO algorithms a couple of times on the list over the years. But since you're making more progress than most have, here is a nice pair of 400,000 (!) sample data sets for you to use: http://www.leapsecond.com/pages/gpsdo-sim/ For playing with GPSDO, the character of the typical 1PPS is very easy to model (it's basically a few ns of noise that nicely averages down at 1 over tau out past a day) so going all the way back to RF simulation of the GPS SV signal(s) might be overkill. In any event, I found it much easier to just take real GPS 1PPS data, and real OCXO data, and then simulate a GPSDO from those two raw data sets. You can plot phase, frequency, ADEV of both inputs and one output and see the GPSDO humps we always talk about, etc. /tvb _______________________________________________ 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.
