Hal Murray said the following on 12/11/2007 05:57 PM: >> As great as GPSDO are, the problem with using them in a portable >> environment is the time it takes to do a survey and then get to final >> lock; mountain-toppers may not be in one place long enough. > > What if you use a navigation GPS unit rather than a timing unit?
To get decent (for some definition of "decent") timing, you need to operate the receiver in "0-D" mode, telling it where it is and letting it solve just for time. I haven't done the experiments myself but I believe that the time accuracy is pretty dramatically degraded when operating in 2-D or 3-D mode. > How long does a survey take (in good conditions) and what sort of time > constant would you want to use with a navigation box? It depends on the receiver, but usually it's a few hours to a full day. Of course, if you use external software you can use whatever time period you want. John > Does anybody have graphs of the PPS wander from a navigation unit? > > > I like the lock-to-rubidium suggestion. > > _______________________________________________ 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.
