[time-nuts] GPS Jamming in the UK

Bruce Rahn brahn at woh.rr.com
Tue Nov 13 18:43:55 UTC 2007


GandalfG8 at aol.com wrote:
> 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
Nigel,

GPS 'denial of service' (aka jamming) tests are fairly common here in
the US.  In 'another life', I was involved with them.  Public notice is
given in advance of planned testing.

You might find this link of interest: 
http://www.fly-low.com/features02/gpsdenial.html

This link provides a listing of past, current, and future denial of
service tests: 
http://www.navcen.uscg.gov/gps/gpsnotices/GPS_Interference.pdf

There have also been documented cases of inadvertent/unscheduled tests. 
With a little bit of searching, you can find them :)

What you're reading about is real!  Hope this helps a little.

Bruce -- WB9ANQ

-- 
Bruce Rahn

Wisdom has two parts:
1.  having a lot to say; and
2.  not saying it!





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