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Intentional GPS Jamming On the Increase
benst writes "Here's yet another way to measure the success of GPS: by the efforts to negate it. While unintentional jamming continues to rise, intentional jamming by both foreign military forces and at-home miscreants of various stripes has shown increased vigor in the past six months. Related here are recent instances of intentional jamming on each side of the border, and (briefly outlined) one initiative mounted by the National Geospatial Intelligence Agency (NGA) to counteract it. Also, here are some ways to detect and prevent jamming."
How could they be jamming us if they don't know... that we're coming... Break off the attack, the shield is still up.
Raspberry...only one man would dare to give me the raspberry...LONESTAR!
Tic-Tac-Toe, Global Thermonuclear War, and relationships all have the same winning move.
The best way of jamming the signals will soon be to down the satellite.
How hard is to hit a satellite right now?
What's the best method? Microwaves? Laser? Missile? Or my preferred method, Killer satellite robot.
Thank God. I think they should be jamming GPS in some places. Or more specifically, start jamming some people's GPS.
It might start people actually thinking on their own. I know one bridge that has been hit 12 times in the last 3 years by trucks that were too tall. In the last 10 years before that, I was told only 2 people hit the bridge.
Wanna take a guess how many of these new truckers are just listening to their GPS units blindly?
I didn't get this at first, so here. Its from space balls
NB: The message above might reflect my opinion right now, but not necessarily tomorrow or next year.
"Were jamming, jamming, and I hope you like jamming too"
It's one thing hitting a LEO sat. It's quite another trying to hit a GPS satellite which is 26000 km up.
Engineering is the art of compromise.
Fines from the FCC range from $7,000 to $10,000 dollars per offense for such illegal operations. There may be other laws on this due to the fact that people rely on these things heavily.
sudo mod me up
I would say the obvious solution to jamming is to have secret signals from the satellites. If you use spread-spectrum techniques your signals become more resistant to jamming. It's possible you might even make your signal nearly undetectable, so that your enemies don't even know it exists.
This being a well-known technique in military radio communications, I would be a little surprised if (1) there weren't already "black" SS signals available to the military, or (2) there will be soon enough.
They may not be especially worried about this. It's not like it's hard to detect someone jamming you, and if you're in a war situation a HARM missile can take care of them for you. Generally a big radio signal is a bit of a liability in a war zone. Makes you stand out, more or less like an electromagnetic bull's-eye painted on your chest.
GPS is only necessary to obtain current location of the JDAM once along the flight path. Once the position is known to a reasonable degree of accuracy, the on-board AHRS can take over and still deliver the payload to within about 1mm/km of distance traveled.
Just to be sure it works on the receiver your boss or the police put on your car? In some European countries the government wants to use GPS modules to tax car traffic: an excellent reason to jam them.
Given the continued insistence my government has on collaborating with my mobile carrier, I want to buy a jammer I can hook into the power source on my phone to jam it off their radar. 40-50cm range should do it.
VLC FOR MAC IS DYING! IF YOU DEVELOP, PLEASE SAVE IT!!
Not familiar? Oh, your /. account has SO been revoked. n00b. :)
SIG: HUP
After all, they deny lots of junk up there.
Just shoot one of them down and see who complains and THEN you'll know whose it was.
Don't forget the huge disagreement between the US and Europe over the Galileo satellite system. The EU intended to use the GPS military band carrier frequencies for Galileo, so that the US couldn't jam it without also jamming the signal used by their own armed forces. Eventually the EU backed down and agreed to use separate frequencies.
That second link is seven pages. Normally anything posted to /. that's more than say, three pages, consists of 400k size pages of advertisements, banners, and otherwise obnoxious noise with maybe three paragraphs (4k or so) of actual content in the middle of the page, that you have to continuously click (NEXT PAGE) to read the next few sentences on.
Not that one. Actual, real content. Multiple pages of real information. What has the world come to? Someone's posting content for the purpose of actually informing us, rather than burying us in cheap banner hits.
The first link is possibly even better than that though. The same information density, in only ONE page. Normally they'd have spread that among at least five banner-whoring pages? Kudos to gpsworld.com for serving their readers. It's pages like that which make me wish I could leave my banner-blockers turned off all the time.
I work for the Department of Redundancy Department.
You can blame AF Space Command. This was accomplished years ago as a challenge project by a team of young AF officers under a "fresh ideas" program. Teams are formed from selected applicants and given a small budget and few weeks to develop and execute a proposed space related project using off-the-shelf, commercially available items. One of these teams was concerned about GPS jamming and built a jammer. Range was limited, of course, but the threat was proven to be real.
As others have pointed out, brute force jamming is easily discovered when one knows what to look for. Fortunately, that was the second part of the project, development of methods for detection and location of a GPS jammer.
Sadly, it seems they weren't the only ones with the idea.
Invenio via vel creo
NVM... i'm a moran.
it looked like the slashdot ad was in your sig.
Hmmm witty sig or funny sig? Maybe elitest techy sig!
I used to work in a an office in the English-Philosophy Building at the University of Iowa. The street in front of our window, Iowa Avenue, had a low bridge accompanied by a warning side about a 100 feet away with chains that dangled down to hit the roof or window of vehicles too tall to make it under the bridge. I'd say about twice a summer, when all the students were moving, moving trucks would ignore the horrible crash of the chains to next produce the extremely loud boom of a truck smashing off the first three to ten feet of the cargo box. Sometimes commercial trucks hit it too, but moving time was the real season to see this. I think I saw one truck in my whole eight years or so there that actually backed up and went around. Of course, I probably missed quite a few doing that, as what really made you take notice was the collision with the bridge.
It is worth noting that the Tomahawk missile is equipped with a precision INS and Terrain Contour Matching systems. By the time a Tomahawk nears its target GPS is not really being used. The GPS is used heavily right after launch to correct errors in the INS, once within 30 minutes TOT the weapon doesn't need GPS to hit its target with precision. Jamming of GPS usually is going to occur within a limited range of targets, so jamming is basically useless at that point
Also, don't forget that SEALs usually are the first on the scene to paint targets with a laser so LGBs can be deployed from high altitude aircraft to take things like jamming equipment out.
There is a definite threat, but rest assured, our ability to blow stuff up is not greatly hindered by GPS jamming.
Besides on the autobahn going 75 mph feels like you are in a traffic jam. 125 mph is pretty normal on the autobahn and 185 mph is not unheard of, of course you should not go those speed when the roads are busy.
Just a reminder: If you are involved in an accident going at 80mph (130 km/h) or more, it is deemed to be your fault unless you can prove that the accident was unavoidable even at lower speed. So if you go at 125 mph, passing other cars, and you crash into someone who pulls out without realizing you were coming, it is _your_ fault. Most likely it will be considered "gross negligence" instead of just negligence, which means your insurance doesn't pay. So you'll pay for the damage to your car out of your own pocket, and the insurance will do whatever they can to recover the damage to the other car from you.
CDMA relies on GPS for its timing. Every cell tower has a GPS receiver so that it can synchronize its time with other cells (and the RNC at the centre of the cell network). Timing accuracy is a fundamental part of CDMA's hand-off design.
This problem was encountered in China caused by their military. They literally had a truck driving around jamming the GPS signal making for intermittent problems - always the most difficult to investigate.
IMHO, neither WAAS nor DGPS are solutions to the jamming problem.
WAAS signals are uploaded to the GPS satellites and broadcast as part of the GPS signals. Thus, when GPS is jammed, WAAS is jammed too.
DGPS ground based transmitters send signals that are potentially strong enough to overcome jamming. However, DGPS transmits the difference between local and GPS estimates. If neither the DGPS, nor your local GPS can receive the GPS signals due to jamming, then DGPS is no help.
Considering that GPS is often used to monitor fleets or even driving patterns by insurance companies, it may be helpful to jam my own GPS. It would allow me to go to the corner bar and hang out for awhile, and then resume my route. I do not need to jam the whole system, just my little corner of the world, corner bar that is...
no comment