Well; maybe more to it. Ballon tether carries a few watts to transmit from the ballon altitude to all other sites.
At predetermined times the master site balloon transmits to the other sites. The other sites respond with their estimated time. The master provides corrected time. Knowing past history of path properties & precise (ballon) location at each transmission (data sent with transmission); the rest should be easy. The master has to precisely locate its own balloon just prior to transmitting to the other sites. even if it's balloon is wandering, a short (10ms) delay to transmit will create negligible error. Ballons might be at each site to create redundant data & suffer a few lost ballons while waiting for replacements, or to switch time master. It might be necessary to update path properties just prior to timing. Pete Rawson On Sep 10, 2010, at 12:14 PM, Mark J. Blair wrote: > > On Sep 10, 2010, at 10:47 AM, Pete Rawson wrote: >> Can you use tethered balloons at each site to obtain adequate S/N >> in their position to permit time calculations to 30ns uncertainty? > > > Tether a single balloon to three sites to reduce the balloon's displacement > due to wind, and then measure its position relative to the three sites by > laser or radar ranging! :-D > > > > > -- > Mark J. Blair, NF6X <n...@nf6x.net> > Web page: http://www.nf6x.net/ > GnuPG public key available from my web page. > > > > > > _______________________________________________ > 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.
