GPS jamming

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

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.

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.

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.

"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:

????

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:

????

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?