Hi If "indoors" always includes a view through unshielded windows to towards the equator, then you might be ok. If it includes pole only facing offices in a conventional steel structure - not so much. The issue isn't so much time, as ability to get a good enough signal to lock to. If you add a "unknown" location (you don't have a survey) and an "unknown" almanac (you have been off for a while), that just makes things harder.
Consider that while I can get cell phone coverage anywhere in my home, there are buildings in the area that I can't get coverage in. Around here, (as in most urban areas), if I can't get a cell phone signal, there's no chance at all of getting GPS. Provided you have a valid almanac, a rational location fix (as in a survey), and are tracking multiple satellites, I can't think of a case where you would have a significant time error. That may just be my lack of imagination. For one second accuracy, a time tick over a cell phone should be fine. That would be far more robust than a GPS setup. Bob On Nov 20, 2012, at 6:33 AM, Tom Harris <celephi...@gmail.com> wrote: > Greetings > > I know that the accuracy of GPS degrades indoors. However, suppose > that I just want to turn a GPS module on, acquire the current time > accurate to a second, and then turn it off. I can get a good deal on > the U-Blox LEA-5H modules (same as used on Arduino shields I think), > which have a high sensitivity, and I can use an active antenna if > needed. > > Am I wasting my time. Sorry for not requiring the time more accurate > than a second, but that's all the clients require. > > -- > > Tom Harris <celephi...@gmail.com> > > _______________________________________________ > 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.