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    Re: How Many Chronometers?
    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
    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.
    > >
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