On 10/18/2012 1:20 PM, [email protected] 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 -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
