Satnav are not LEO but MEO. Which is good - less sv to cover the earth. Less good because distance is higher compared to LEO regarding signal power at earth.
-- Björn Skickat från min Mobil -------- Originalmeddelande -------- Från: Scott McGrath <scmcgr...@gmail.com> Datum: 2013-07-30 14:50 (GMT+01:00) Till: j...@quikus.com,Discussion of precise time and frequency measurement <time-nuts@febo.com> Kopia: Discussion of precise time and frequency measurement <time-nuts@febo.com> Rubrik: Re: [time-nuts] Story in the Economist about GPS jamming Any competent engineer could have told the powers that be that a satellite system based in LEO has a relatively high risk profile from the Universe/hostile activity/spoofing and jamming Yes GPS is/was oversold. Trouble is Clarkes law applies here (any sufficiently advanced technology is indistinguishable from magic). And this applies double to the technological illiterates in DC See Sen 'Tubes' Stevens for the canonical example Sent from my iPhone On Jul 29, 2013, at 12:46 PM, "J. Forster" <j...@quikus.com> wrote: > It seems to me that GPS has been oversold as the be all, end all system > that made all other systems obsolete and GPS has become all but an > indespensible utility. > > Reports like this, could well be used to promote a backup, like LORAN or > eLORAN, just as public buildings have backup generators. > > YMMV, > > -John > > ================== > > >> >> http://www.economist.com/news/international/21582288-satellite-positioning-data-are-vitalbut-signal-surprisingly-easy-disrupt-out?fsrc=scn/tw/te/pe/outofsight >> >> -Bill >> >> >> >> >> >> _______________________________________________ >> 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. _______________________________________________ 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.