Thanks! Have fun experimenting Said
Sent From iPhone On Oct 18, 2012, at 18:54, Sarah White <kuze...@gmail.com> wrote: > On 10/18/2012 1:20 PM, saidj...@aol.com wrote: >> Let the GPS average the antenna position over a very long time. >> >> On a good GPSDO one can select the number of averages, and the position >> variance before the survey is finished, and the (now very precise) position >> is >> stored in memory. >> >> Indoors this may take a very long time to do (weeks?), but should work too. >> The problem indoors is multi path, one never knows where the signal is >> coming from that is seen. Setting up signal squelch in the GPS really helps >> with that, for example the C/No could be set to a minimum of 35dB, and >> anything below that is ignored so only the strongest signals are used. >> >> We made a customer's urban solution work that way, it effectively deleted >> all the multipath issues he had from adjacent high-rises, since the >> multipath signal strengths yielded about 20 to 28dB C/No and were thus all >> squelched, whereas the direct signals were 35 to 50dB C/No. >> >> bye, >> Said > > Wow thanks. > > I've never seen such an insightful explanation for dealing with > multipath signal issues. Fortunately, I'm not doing this for any sort of > "for profit" purpose / just learning for now. This list really has a lot > of experts :) > > -- Sarah > > P.S. Sorry for the earlier PGP signatures... In the past 24 hours > someone pointed out to me, to paraphrase: "most of the people reading > this list aren't using email systems which make any use of the (rather > long) message validation blocks" > > _______________________________________________ > 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.