GPS "Testing"

[Brian Hawes]

Could this be a test to investigate the ability of a near ground-based transmitter to distort or disable GPS over some area?
I know that Trinity House, who manage our Lighthouses and some other local navigation aids  performed such a test 
and apparently succeeded in distorting GPS over several square miles.
Not good if the bad guys could do this!
You are all good guys, right?

Please eat this message after you have read it.

Brian

________________________________________
From: tacos-bounces+hawes=herald.ox.ac.uk at rf.org [tacos-bounces+hawes=herald.ox.ac.uk at rf.org] On Behalf Of Doug Gentges [doug.gentges at gmail.com]
Sent: 21 January 2011 16:51
To: tacos at amrad.org
Subject: GPS "Testing"

This seems strange:

https://www.faasafety.gov/files/notices/2011/Jan/GPS_Flight_Advisory_CSFTL11-01_Rel.pdf

"The Department of Defense will conduct GPS tests on January 20th
through February 22nd
2011.  During testing, the GPS signal may be unreliable or unavailable."

"During testing, GPS will be unreliable and may be unavailable with in
a circle with
a radius of 370NM and centered at 304906N/0802811W or the location known as
105.25 degrees and 52.1 NM from the SSI VOR at FL400; decreasing in area with
a decrease in altitude to a circle with a radius of 325NM at FL250; a
circle with a
radius of 260NM at 10,000FT MSL and a circle with a radius of 215NM at 4,000FT
AGL."
(see the PDF for the area that will be impacted, it's off the coast of GA/FL

Doug
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