GPS jamming

[S Green]

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

[Denny]

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

[Jon]

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

[Ross]

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

[[email protected]]

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...

[Paul kgyy]

>
> 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...

[NoneYa]

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.

[RST Engineering]

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>

[Gig 601XL Builder]

RST Engineering wrote:
> 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
>

Any given EW aircraft in the USAF fleet to narrow localize and an AWACs
that'll get a skin paint on the balloon. They could probably pump enough
energy through the radar to pop the balloon.

[El Maximo]

"RST Engineering" > wrote in message
...
> 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.
>
Your scenario:
> 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.
My defense:

EMP (you didn't mention cost ,feasibility, or collateral damage)

Your countermeasures:

????

[RST Engineering]

You are going to skin paint a vinyl balloon filled with helium? So I turn
it on for ten minutes and then off for ten. By that time it has drifted a
few miles. Try spotting a balloon that only has to lift about five pounds
at a quarter mile, much less a couple of miles.

Sorry, no "probably" allowed. Neither helium nor vinyl absorb enough power
to be popped by anything other than a direct hit.

Jim

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



> Any given EW aircraft in the USAF fleet to narrow localize and an AWACs
> that'll get a skin paint on the balloon. They could probably pump enough
> energy through the radar to pop the balloon.
>

[RST Engineering]

Countermeasure is trying to figure out how you are going to generate an EMP
on a moving target at FL300? Nuclear explosion? One a day or one every few
hours depending on how often I launch? No radar paint means that you can't
detect altitude, just azimuth.

Jim

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



>
> EMP (you didn't mention cost ,feasibility, or collateral damage)
>
> Your countermeasures:
>
> ????
>

[Larry Dighera]

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. :-(

[[email protected]]

Gig 601XL Builder <wrDOTgiaconaATsuddenlink.net> wrote:
> RST Engineering wrote:
> > 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
> >

> Any given EW aircraft in the USAF fleet to narrow localize and an AWACs
> that'll get a skin paint on the balloon. They could probably pump enough
> energy through the radar to pop the balloon.

Good luck in finding a radar that will give skin paint on a helium
filled, plastic balloon.

You could DF from the emitted signal, but a simple on/off timer on
the transmitter would make it real hard to find in any real wind.

--
Jim Pennino

Remove .spam.sux to reply.

[Roger (K8RI)]

On Wed, 22 Aug 2007 10:19:01 -0700, 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

Except that source doens't need to be very far off the ground which
severely limits the detection range for ground based systems.

>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

[Roger (K8RI)]

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.

[Dan Luke[_2_]]

"NoneYa" wrote:

> ILS and DME will never go away. Not in my lifetime.

How long ya' plan on living?

--
Dan
T-182T at BFM

[Denny]

Anyway,while I use and appreciate my GPS moving map with terrain
warnings, I have not removed my NDB, ILS, VOR, DME from my panel...
If push really comes to shove I can home on the local radio station
from 80-100 miles out and from there fly a compass course to the
airport...

denny

[Jon]

On Aug 22, 6:14 pm, "Roger (K8RI)" > wrote:
> On Wed, 22 Aug 2007 10:19:01 -0700, Jon >
> wrote:
> [...]
>
> >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
>
> Except that source doens't need to be very far off the ground which
> severely limits the detection range for ground based systems.

Fair enough. Mayflower's products are intended for airborne use.

> [...]

Regards,
Jon

[Jon]

On Aug 22, 3:27 pm, NoneYa > wrote:
> 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.

Multiple sources, especially when pulsed are certainly more difficult
to detect.

> A DF is useless against a moving target.

In the case of weather baloons, the effective area being jammed will
be moving, dependent of course, on the winds. Not to mention being a
bunch of targets that will otherwise show up, either visually or
perhaps on some sort of other surveillance device.

> GPS jamming is one reason ILS and DME will never go away. Not in my lifetime.

>From (among other studies) the vulnerability report, it's already
become quite clear that GPS is will complement, not replace other
navaids.

Jamming an INS is rather difficult, unless perhaps you happen to have
a big gravity source, say a large planet nearby, that you can
deploy ;)


Regards,
Jon

[Larry Dighera]

On Wed, 22 Aug 2007 15:27:45 -0400, NoneYa > wrote
in >:

>A DF is useless against a moving target.

What lead you to that conclusion? If I recall correctly, FSSs provide
DF services to moving aircraft.

[Ash Wyllie]

RST Engineering opined

>Countermeasure is trying to figure out how you are going to generate an EMP
>on a moving target at FL300? Nuclear explosion? One a day or one every few
>hours depending on how often I launch? No radar paint means that you can't
>detect altitude, just azimuth.

Or higher. Balloons can go over 100,000'.


-ash
Cthulhu in 2007!
Why wait for nature?

[Alfaest]

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

I absolutely agree with your opinion. but there are a lot of other usages about GPS, I got the cell phone jammer and its details from http://www.jammerall.com/. it is really a cool website, it helps me a lot.There are some other jammers devices in it. share with you all. you can come and see as you like. Cell phone signal jammers

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