On Mon, Jun 25, 2012 at 6:43 PM, <[email protected]> wrote: > Yeah, I read it. Typical Fox. The headline isn't accurate since they > spoofed the civilian GPS system, not the military GPS. >
I think it is. Currently the military uses GPS guided drones put the article says they will see more and more used, even by companies like Fed Ex. I don't think I deliver this will happen soon but it might. The article says that these new drones will be susceptible to GPS spoofing. But there is a simple "fix" that to me seem obvious. When you design a nab system for a drone they should use inertial nav. You can't spoof an IMU. But the cheap IMUs drift and need GPS updates. So each time you update the INU to do a sanity check on the GPS and see if it is within the drift range of the IMU. If not you assume the GPS is being spoofed and continue using the INU data. There are other backups too. One is commercial radio broadcast stations. You can measure doppler to several of them. And let's not forget about video cameras that can see the ground or up to stars. lastly there is common sense that could be programmed into a navigation system, for example if flying a straight course you'd expect the sun angle to remain constant and the horizon to remain level Same with any human pilot, truck driver or hiker, all of these people know it is dumb to rely only on GPS. Everyone cross checks it with other nab sources. > ------Original Message------ > From: J. Forster > Sender: [email protected] > To: [email protected] > ReplyTo: [email protected] > ReplyTo: Discussion of precise time and frequency measurement > Subject: [time-nuts] Spoofing GPS > Sent: Jun 25, 2012 6:39 PM > > > http://www.kentuckynewsnetwork.com/cc-common/news/sections/newsarticle.html?feed=104668&article=10225815 > > -John > > ================ > > > _______________________________________________ > 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. > -- Chris Albertson Redondo Beach, California _______________________________________________ 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.
