FOX News Breaking: Iraq may have purchased GPS jammers from Russians

FOX News Channel | January 9, 2003 | FOX News Channel Staff

[expatpat]

Good to hear form you.
Another Old Crow.

[Bogey78O]

A jammed JDAM is still just as explosive. We'll just have to drop more. I'm not complaining.

[honway]

http://www.fas.org/man/dod-101/sys/smart/jdam.htm


Average unit cost
(40,000 units) $18,000 current estimate

[evad]

I thought she was that other terrorist sympathizer...Patty Murray.

[OReilly]

4 Watts can jam to 200KM??

4 Watts is like 4 KW when you compare the signal levels that GPS receivers in the JDams are working with.

[expatpat]

The satelite signals being received are quite weak, unless you use a large antenna. There has to be noise-rejection processing in the receiver anyway.

[Mr. Mojo]

JAM THIS, IRAQ (AND RUSSIA)

[Myrddin]

The GPS signal from the satellite is below the noise floor. You recover it by generating the expect PN sequence and summing it with the received signal. The generated sequence is retarded on intervals until the generated sequence is in phase with the satellite signal. The sum is then above the noise floor. A 4 watt transmitter at 200 kilometers is competing with a satellite transmitting from 12,000 miles up (minimum distance to the surface). The terrestrial signal can easily swamp the GPS front end and cover the satellite signals. The PN sequences for the C/A channel are "advertised" by the satellites in the almanac. The jammer just needs to generate all the possible PN sequences with slightly more delivered energy than the actual satellites.

The current "phase" of the encrypted military channel is broadcast on the C/A channel. It only repeats every 7 days, so you need to get a fix on roughly where you are in the sequence AND possess the crypto key with which it is encrypted. Swamping access to the C/A channel signal will prevent picking up the "phase" reference for the military encrypted channel.

[Momaw Nadon]

Attack on Iraq Betting Pool

[Monti Cello]

What's up with the baby milk factories?

Don't Iraqi women have nipples like the rest of 'em?

[relee]

...How many bombed out mosques does it take to start a war between the U.S. and all of Islam?...

Two or Three Hundred Thousand?

[justshe]

I can buy this as a psych-op....as some are suggesting on this thread. I certainly HOPE that is the case...and the REST OF THE STORY...is that we have a solution...READY to go. Heck...maybe the units they received are even defective and that false sense of security is the rest of the story.

[dennisw]

Thanks

[The Duke]

However, these jammers may be highly portable, and they may only need to be turned on for a minute or two in order to permanently confuse a cruise missile(?)

Where's a good ol' ring gyro when ya need one!?!?

[justshe]

What you just posted is so far above my knowledge...excuse me if I ask.....is ANY of that something the enemy could use?

[OReilly]

What's up with the baby milk factories? Don't Iraqi women have nipples like the rest of 'em?

It is sad, but Saddam made a big deal about the little British boy (one of his guest human shields') getting his milk. A lot Saddam's propaganda seems Mickey Mouse and transparent to us, but to much of the rest of the world, it is very real and effective.

[El Gato]

4 Watts can jam signals to 200KM?? Hmmmm. I'm no RF electrical engineer, but I seem to recall a broadcast omnidirectional signal loses power proportional to the cube of the distance from the antenna. 4 Watts can jam to 200KM?? FReeper expert help requested.

It's the square of the distance, not the the cube. Remember though that the GPS satellites, whose signal is what is actually being jammed, are much farther away than 200km, so the signal to be overcome is pretty weak, even though it's intial stregth may have been stronger than the jammer.

[Right_in_Virginia]

"EASILY solved problem. EMP bombs in the first hour, JDAMS follow."

I don't understand a word of what you said...but, I feel surprisingly much, much better ;^)

[Nuke'm Glowing]

Thanks oldtimer. Too bad there are too many sheeple and not enough of us "been there, done that group" left to make our point....