Hi The “real” answer is to beg / borrow / obtain a geodetic receiver and let it run for an hour or ten at your location. Unless you are really out in the middle of nowhere, that will give you a very accurate position. If you don’t have any buddies who are surveyors, they do show up on eBay at < $300 sort of prices (with antenna) from time to time.
As always, there is a point of “that’s probably good enough”. For various reasons, vertical errors are not going to be quite as important as horizontal errors. If you figure 3 ns / meter horizontal and allow a bit more than that vertical … you are doing what most people do. Once you get the geometric error under 1 ns, you probably are at 1/10 the other errors you see over a 24 hour period on L1, under good conditions. If the ionosphere is acting up, things could be much worse. Bottom line: If your estimates are within a foot of being correct, that’s probably good enough. Looking at the raw data is *always* a good idea. Things like multi path can really skew a bulk average … Bob > On May 2, 2016, at 2:44 AM, Joseph Gray <jg...@zianet.com> wrote: > > Now that I have three (maybe four) working GPSDO's, I'd like to set > the GPS coordinates the same on all of them. The survey that each one > does produces very similar coordinates, but not exactly the same. > > The Z3801A's have VP's, the Lucent has a UT+. I don't know what is in > the 58540A, as the manual doesn't say and the :DIAG:IDEN:GPS? command > isn't supported. > > Would using a modern GPS, like a uBlox, and averaging for quite a > while produce acceptable coordinates to manually enter into all of the > GPSDO's? Of course the uBlox would be on the same splitter and antenna > as the other units during the averaging. > > > Joe Gray > W5JG > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.