I can't imagine that we don't sanity check without baro , altimeters . Isn't that the inspiration for the Kalman filter ?
--- On Thu, 6/28/12, J. Forster <[email protected]> wrote: From: J. Forster <[email protected]> Subject: Re: [time-nuts] Spoofing GPS - news article To: "Discussion of precise time and frequency measurement" <[email protected]> Date: Thursday, June 28, 2012, 9:53 AM And not the UAV of the story, I'm sure. -John ================= > The picture is not of a Predator, it's a Global Hawk, a much larger > aircraft. > > Didier KO4BB > On Jun 28, 2012 11:47 AM, "Brooke Clarke" <[email protected]> wrote: > >> Hi Dave: >> >> The article shows a photo of a Predator, yet what the UoT guys did was >> hack a toy helicopter that used only the L1 civilian GPS signal. >> My guess is that they used a home made 3rd generation GPS simulator with >> a >> moderate power amp and antenna. >> http://www.prc68.com/I/5001A.**html >> <http://www.prc68.com/I/5001A.html><- first generation single satellite >> single signal >> http://www.prc68.com/I/**NTgpsSTR2760.shtml<http://www.prc68.com/I/NTgpsSTR2760.shtml><- >> second generation multi satellite and multi signal >> >> Note that all GPS satellites transmit on the same frequency and so in a >> sense interfere with each other. >> But because of the orthogonally of the codes the receiver can process >> each >> signal. >> When a higher power signal is received the "capture" effect eliminates >> the >> weaker signals so a high power signal can easily "capture" the receiver. >> >> Have Fun, >> >> Brooke Clarke >> http://www.PRC68.com >> http://www.**end2partygovernment.com/**2012Issues.html<http://www.end2partygovernment.com/2012Issues.html> >> >> DaveH wrote: >> >>> http://rt.com/usa/news/texas-**1000-us-government-906/<http://rt.com/usa/news/texas-1000-us-government-906/> >>> Dave >>> ______________________________**_________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to https://www.febo.com/cgi-bin/** >>> mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> >>> and follow the instructions there. >>> >>> >>> >> >> >> ______________________________**_________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/** >> mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> >> and follow the instructions there. >> > _______________________________________________ > 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. > > _______________________________________________ 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. _______________________________________________ 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.
