GPS jamming

http://www.flyontrack.co.uk/gpsjam.pdf

GPS has become the navigation tool of choice...
The jamming of GPS is so trivial that any reasonably bright 14 year
old, can manage it - and within his allowance to boot..
Some older navcoms will jam the gps in the plane when tuned to certain
frequencies... A quick google search on the radio models and those
certain frequencies is enough information for one to build a wide area
gps jammer...

It used to be the gov't worried about a terrorist using the GPS to
guide a weapon to a precise point... Whereas, they should worry about
a terrorist blocking GPS over a wide area on a dark and stormy night,
with airliners unable to land, ships losing navigation near the coast,
etc...

denny

On Aug 22, 7:47 am, Denny wrote:
GPS has become the navigation tool of choice...
The jamming of GPS is so trivial that any reasonably bright 14 year
old, can manage it - and within his allowance to boot..
Some older navcoms will jam the gps in the plane when tuned to certain
frequencies... A quick google search on the radio models and those
certain frequencies is enough information for one to build a wide area
gps jammer...

It used to be the gov't worried about a terrorist using the GPS to
guide a weapon to a precise point... Whereas, they should worry about
a terrorist blocking GPS over a wide area on a dark and stormy night,
with airliners unable to land, ships losing navigation near the coast,
etc...

denny

They should but they probably aren't as much as some might think they
should be, given the ability to mitigate against it. The old measures/
counter-measures game.

The cool thing about a jammer, is that it has to emit something. A
single source for wide-area jamming is fairly easy to detect. There's
a company just north of here in Boston (Mayflower, used to be in
Billerica, moved down the road to Burlington) that's got a design with
phased arrays of antennae that are used to DF on the source, quite
effectively.

http://www.mayflowercom.com/products.html

Happy mitigating

Regards,
Jon

Jon wrote:
On Aug 22, 7:47 am, Denny wrote:



They should but they probably aren't as much as some might think they
should be, given the ability to mitigate against it. The old measures/
counter-measures game.

The cool thing about a jammer, is that it has to emit something. A
single source for wide-area jamming is fairly easy to detect. There's
a company just north of here in Boston (Mayflower, used to be in
Billerica, moved down the road to Burlington) that's got a design with
phased arrays of antennae that are used to DF on the source, quite
effectively.

http://www.mayflowercom.com/products.html

Happy mitigating

Regards,
Jon

I used to live in Billerica some 30 years ago. Bet it has changed. I am
now down in north Texas.

--

Regards, Ross
C-172F 180HP
KSWI

On Wed, 22 Aug 2007 12:26:33 -0500, Ross wrote
in :

I used to live in Billerica some 30 years ago. Bet it has changed. I am
now down in north Texas.

Are discussing GPS Jamming or the history of where you reside. :-(

On Aug 22, 11:19 am, Jon wrote:
On Aug 22, 7:47 am, Denny wrote:

GPS has become the navigation tool of choice...
The jamming of GPS is so trivial that any reasonably bright 14 year
old, can manage it - and within his allowance to boot..
Some older navcoms will jam the gps in the plane when tuned to certain
frequencies... A quick google search on the radio models and those
certain frequencies is enough information for one to build a wide area
gps jammer...

It used to be the gov't worried about a terrorist using the GPS to
guide a weapon to a precise point... Whereas, they should worry about
a terrorist blocking GPS over a wide area on a dark and stormy night,
with airliners unable to land, ships losing navigation near the coast,
etc...

denny

They should but they probably aren't as much as some might think they
should be, given the ability to mitigate against it. The old measures/
counter-measures game.

The cool thing about a jammer, is that it has to emit something. A
single source for wide-area jamming is fairly easy to detect. There's
a company just north of here in Boston (Mayflower, used to be in
Billerica, moved down the road to Burlington) that's got a design with
phased arrays of antennae that are used to DF on the source, quite
effectively.

http://www.mayflowercom.com/products.html

Happy mitigating

Regards,
Jon

A HARM missile tuned into the jammer's frequency would be a pretty
effective deterent...

A HARM missile tuned into the jammer's frequency would be a pretty
effective deterent...

Well, any terrorist worthy of the name would locate the jammer on the
roof of a hospital or school...

Paul kgyy wrote:
A HARM missile tuned into the jammer's frequency would be a pretty
effective deterent...

Well, any terrorist worthy of the name would locate the jammer on the
roof of a hospital or school...


Build about a dozen jammers and then launch them on weather
balloons or magnetic mount them on the side of trains or trucks.

A DF is useless against a moving target. GPS jamming is one
reason ILS and DME will never go away. Not in my lifetime.

On Wed, 22 Aug 2007 10:43:28 -0700, wrote:

snip

http://www.mayflowercom.com/products.html

Happy mitigating

Regards,
Jon

A HARM missile tuned into the jammer's frequency would be a pretty
effective deterent...


To some one set up in a high rise apartment building in a densly
populated area.

Detecting it is one thing, stopping it is quite another kettle of fish.

So tell you what, I'll give you a scenario, you give me your countermeasures
and I'll defend against it.

CW emitter using a watt of erp semi-isotropic radiation inside of a "static
proof" bag (fairly decent radar stealth shielding at the frequency in
question) in a plastic bucket under a helium weather balloon. Power source
(inside the bag) is a small garden tractor 20 amp-hour battery. A watt of
RF requires about 2 watts of dc power, or about 170 mA from the 12 volt
battery. That's roughly 120 hours (5 days) of operation on a continuously
moving target. Do a little winds aloft calculation when filling your
balloon and you can drift them across the country, doing a wide area
blankout for days at a time.

Perhaps $1000 in parts at the outside and at that price I can launch one a
day for what terrorists spend as chump change. Launch point can move 500
miles via automobile in a day easily.

Jim

--
"If you think you can, or think you can't, you're right."
--Henry Ford


"Jon" wrote in message
ups.com...



They should but they probably aren't as much as some might think they
should be, given the ability to mitigate against it. The old measures/
counter-measures game.

The cool thing about a jammer, is that it has to emit something. A
single source for wide-area jamming is fairly easy to detect. There's
a company just north of here in Boston (Mayflower, used to be in
Billerica, moved down the road to Burlington) that's got a design with
phased arrays of antennae that are used to DF on the source, quite
effectively.

http://www.mayflowercom.com/products.html