> ... but then they get taken indoors and plugged into the network, and > probably never get a clear view of a GPS or GLONASS satellite again.
A high-sensitivity GPS receiver might still give useful results here, especially if it has a high-quality reference oscillator like an OCXO. Even 20 or 30 dB of path loss from roof to your device might be manageable. Of course, your deployment environment could well be worse. Since you get an initial fix outdoors, you could tell the GPS unit its location, then put it in "time-only" mode, which needs only a single usable satellite. This is the usual mode for timing receivers. If the number of satellites drops to zero, though, an OCXO will not hold over for long inside a 10 microsecond window. Cheers, Peter _______________________________________________ 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.