Skip to comments.
FOX News Breaking: Iraq may have purchased GPS jammers from Russians
FOX News Channel
| January 9, 2003
| FOX News Channel Staff
Posted on 01/09/2003 4:18:02 PM PST by MeekOneGOP
FOX News Breaking:
Iraq may have purchased GPS jammers from Russians
TOPICS: Breaking News; Crime/Corruption; Foreign Affairs; News/Current Events; Politics/Elections; US: District of Columbia
KEYWORDS:
Navigation: use the links below to view more comments.
first previous 1-20 ... 41-60, 61-80, 81-100 ... 161-162 next last
To: JRandomFreeper
Good to hear form you.
Another Old Crow.
61
posted on
01/09/2003 5:03:34 PM PST
by
expatpat
To: rs79bm
A jammed JDAM is still just as explosive. We'll just have to drop more. I'm not complaining.
62
posted on
01/09/2003 5:04:47 PM PST
by
Bogey78O
(It's not a Zero it's an "O")
To: chaosagent
63
posted on
01/09/2003 5:06:05 PM PST
by
honway
To: MeeknMing
I thought she was that other terrorist sympathizer...Patty Murray.
64
posted on
01/09/2003 5:06:23 PM PST
by
evad
To: c-five
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.
65
posted on
01/09/2003 5:07:43 PM PST
by
OReilly
To: Blueflag
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.
66
posted on
01/09/2003 5:08:27 PM PST
by
expatpat
To: MeeknMing
JAM THIS, IRAQ (AND RUSSIA)
67
posted on
01/09/2003 5:08:29 PM PST
by
Mr. Mojo
To: Blueflag
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.
68
posted on
01/09/2003 5:09:02 PM PST
by
Myrddin
(I'm not out of money, I still have checks)
To: OReilly
What's up with the baby milk factories?
Don't Iraqi women have nipples like the rest of 'em?
Comment #71 Removed by Moderator
To: honway
...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?
72
posted on
01/09/2003 5:11:30 PM PST
by
relee
To: OReilly
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.
73
posted on
01/09/2003 5:13:55 PM PST
by
justshe
(GWB.....Frist....Hastert: The Perfect Trifecta)
To: c-five
Thanks
74
posted on
01/09/2003 5:14:28 PM PST
by
dennisw
(http://www.littlegreenfootballs.com/weblog/weblog.php)
To: Blueflag
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!?!?
75
posted on
01/09/2003 5:17:32 PM PST
by
The Duke
To: Myrddin
What you just posted is so far above my knowledge...excuse me if I ask.....is ANY of that something the enemy could use?
76
posted on
01/09/2003 5:18:51 PM PST
by
justshe
(GWB.....Frist....Hastert: The Perfect Trifecta)
To: Monti Cello
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.
77
posted on
01/09/2003 5:19:08 PM PST
by
OReilly
To: Blueflag
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.
78
posted on
01/09/2003 5:19:26 PM PST
by
El Gato
To: Mariner
"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 ;^)
To: oldtimer
Thanks oldtimer. Too bad there are too many sheeple and not enough of us "been there, done that group" left to make our point....
Navigation: use the links below to view more comments.
first previous 1-20 ... 41-60, 61-80, 81-100 ... 161-162 next last
Disclaimer:
Opinions posted on Free Republic are those of the individual
posters and do not necessarily represent the opinion of Free Republic or its
management. All materials posted herein are protected by copyright law and the
exemption for fair use of copyrighted works.
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson