[iwar] [fc:GPS-vulnerabilities]

From: Fred Cohen (fc@all.net)
Date: 2001-09-07 06:28:28


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From: Fred Cohen <fc@all.net>
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Date: Fri, 7 Sep 2001 06:28:28 -0700 (PDT)
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Subject: [iwar] [fc:GPS-vulnerabilities]
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Aviation Daily: Study Reports GPS Vulnerable To Several Types Of Jamming 
By Jim Baumgarner, Aviation Daily, 9/6/2001

<a href="http://www.aviationnow.com/avnow/news/channel_military.jsp?view=story&id=news/bgps0828.xml">http://www.aviationnow.com/avnow/news/channel_military.jsp?view=story&id=news/bgps0828.xml>

An as-yet-unreleased study on the vulnerability of GPS (Global
Positioning System) shows that satellite networks are vulnerable to
disruptions from several causes, including intentional jamming and
atmospheric effects. 
The study, by the Volpe National Transportation Center, makes several
recommendations to lessen the impact of such events on the national
transportation infrastructure. 
It appears to pour cold water on FAA's plan to use GPS as a sole-means
system, recommending instead the development of affordable backup
systems. 
DOT and the Defense Department had sponsored the Volpe study after
questions were raised in the U.S. and abroad on the wisdom of relying
solely on GPS signals when evidence existed that the signals were
vulnerable to unintentional and intentional disruptions. FAA
nevertheless forged ahead with a policy that GPS be a sole means system. 
That appears likely to change, according to a draft press release from
the DOT and obtained by The DAILY due to be released next week. 
First, DOT wants to brief its modal agencies, the White House and
congressional committees. The report is scheduled to be discussed at a
Sept. 10 Salt Lake City conference, which will include representation by
the Volpe Center's Jim Carroll and a DOT response by DOT's Bart Blue. 
Although subject to change, the draft press release quotes DOT Secretary
Norman Mineta as saying that "this report provides a road-map to
addressing possible vulnerabilities in GPS so that we can maintain the
highest standards of transportation safety. This department is committed
to developing and carrying out a plan based on these recommendations, so
that GPS will fulfill its potential as a key element of the nation's
transportation infrastructure." 
Sources said that both U.S. and international interests hope the actual
report will spell out the vulnerability problems and what it intends to
do about them. An earlier draft report was sent back to Volpe to review
the vulnerability aspects, but sources said Volpe refused to water down
the implications. According to the draft press release, GPS is
susceptible to unintentional disruption from such causes as atmospheric
effects, blockage by building and communications equipment, and by
intentional disruption. 
The report contains a number of recommendations, including continuing
the GPS program with higher broadcast power and with the eventual
availability of three civil frequencies. Another is to make users aware
of the need to mitigate degradation or loss of signal through unintended
inferences by communications sources. 
It also recommends implementing systems to monitor, report and locate
unintentional interference, to assess the applicability of military
anti-jamming technology and to work with industry to make the technology
available for civil uses. The report encourages the development of
"affordable systems as backups to GPS."

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