[time-nuts] GPS Jamming in the UK
Rob Kimberley
rk at timing-consultants.com
Tue Nov 13 19:52:00 UTC 2007
C/A code was originally designed as course clock to allow P/Y code hardware
to lock on, and you should also note that latest generation P/Y hardware can
directly acquire and stay locked without C/A. In the event of a local or
Global conflict, C/A will be denied to some or all users.
The jamming tests undertaken may be part of testing new generation hardware
in high jam/non C/A scenario.
More info in Hugo Fruehauf's excellent paper which I've put on my web site.
http://www.timing-consultants.com/images/Web%20Site%20App%20Notes/saasm%20co
ml%20brfg%207-04.pdf
(and yes, I know I need to remove the spaces in the title)
Rob K
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of GandalfG8 at aol.com
Sent: 13 November 2007 16:51
To: time-nuts at febo.com
Subject: [time-nuts] GPS Jamming in the UK
); SAEximRunCond expanded to false
Errors-To: time-nuts-bounces+rk=timing-consultants.com at febo.com RETRY
I've not come across this before and when a friend first fowarded the link
from another group I thought it was a spoof, and still only half
convinced:-),
but I've just copied this from the official Ofcom Website in the UK......
"The Ministry of Defence conduct occasional tests on military systems which
may result in some loss of service to civilian users of the Global
Positioning System (GPS) including in-car navigation devices and networks
which rely on
GPS signals. Ofcom seeks to provide citizens and consumers with information
about possible interruptions to these services via these email updates
giving
advanced notification of these tests. It must be emphasised that this
notification process only warns of future jamming excercises that are
brought to
the notice of Ofcom and may not cover all jamming exercises. It cannot be
assumed that any loss of service is due to jamming exercises."
There's an option to sign up for email notification.....
_http://www.ofcom.org.uk/static/subscribe/select_list.htm_
(http://www.ofcom.org.uk/static/subscribe/select_list.htm)
Anyone come across this before or actually experienced any identifiable
jamming of signals?
regards
Nigel GM8PZR
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