[time-nuts] GPS Spoofing
Max Robinson
max at maxsmusicplace.com
Mon Jul 29 22:47:07 EDT 2013
Bill quoted.
“The more they overtake the plumbing the easier it is to stop up the drain.”
Scotty in Star Trek The search for Spock.
Regards.
Max. K 4 O DS.
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----- Original Message -----
From: "Fuqua, Bill L" <wlfuqu00 at uky.edu>
To: <time-nuts at febo.com>
Sent: Monday, July 29, 2013 12:12 AM
Subject: Re: [time-nuts] GPS Spoofing
The idea behind GPS spoofing is that one or several surface antennas and
sources could be set up in such a way that they would produce believable
position data that would take a vessel off course. The problem with this
concept is that the person in charge of the GPS spoofing hardware has to
know exactly where the vessel is at all times to start with and other
vessels some distance away, and not very far from the target vessel would
get contradicting signals from the virtual satellites.
Software could be used to detect changes in position data that is
inconsistent with present course and recent data. And in most cases there
would be a period of very inconsistent signals from satellites and more
obvious, signal strengths.
Another way to limit spoofing is to use directional antennas that prevent
reception from near horizon signals. Or detect low angle signals and sound
the alarm or implement a means of ignoring those sources.
The problem very high tech systems are often defeated by low tech solutions.
Successful GPS spoofing would be very high tech.
Many high tech systems that the government had developed in the past have
been defeated by low tech methods. An example is the microwave system that
is intended to turn back rioters by inducing burning pain. It was defeated
by using thick wooden shields which absorbed the RF energy.
Human resourcefulness and determination often defeats technology in low tech
ways. And the more complex a system is the easier it is to defeat. “The more
they overtake the plumbing the easier it is to stop up the drain.”
Most discussions have been about wireless spoofing. However, the most
reliable way to do it would be an “inside job” where a device would be put
on board and patched in the antenna lead. The correct GPS data would be
received by the device and then it would produce a virtual constellation of
satellites that would direct the vessel off course. However, the programmer
would have to know the course that the pilot intended to take in the first
place if his goal is to
take the vessel to a different destination.
73
Bill wa4lav
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