NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: How Many Chronometers?
From: Lu Abel
Date: 2009 Sep 18, 20:22 -0700
From: Lu Abel
Date: 2009 Sep 18, 20:22 -0700
If you look into it, there are two possible "disruptions" to GPS: (a) simply eliminating the signal by, say, interfering with it or (b) supplying false signals. While I'm not sure of countermeasures to this last one, unless the false signal is very, very sophisticated it's possible to detect its presence (by, for example, moving 100 yards and calculating whether the positions of the false satellites agree with the receiver'a new geographic position). GPS has been an important positioning system for the military for over 20 years. I suspect they've given a LOT of thought to countermeasures and counter-countermeasures. At the same time, if there are public links to these seminars, links to them would be appreciated. Apache Runner wrote: > It makes sense. I had a student who went into active duty in the Air > Force post 9/11. Her job was to figure out a way to disrupt GPS > using only information available on the web. Evidently her team > succeeded brilliantly. I don't know the details, but she's given some > seminars on the unclassified parts of the exercise. > > > > > --~--~---------~--~----~------------~-------~--~----~ NavList message boards: www.fer3.com/arc Or post by email to: NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---