GPS jamming

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.

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:

????

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. :-(

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.

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

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.

"NoneYa" wrote:

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

How long ya' plan on living?

--
Dan
T-182T at BFM

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

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

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