Commercial Flights Are Experiencing 'Unthinkable' GPS Attacks and Nobody Knows What to Do
Commercial Flights Are Experiencing ‘Unthinkable’ GPS Attacks and Nobody Knows What to Do::New “spoofing” attacks resulting in total navigation failure have been occurring above the Middle East for months, which is “highly significant” for airline safety.
It was doing this for decades but Western countries only start hearing about it.
Social media have prevailed over classic media, and this time they have proven to be harder to steer.
Iran has been doing this shit for decades. I’m sure Israel has too.
Basically, they figure out what a GPS receiver would hear if it was receiving signals from a specific location, say “London”. They then broadcast those exact signals. Any receiver that hears them now thinks it is in “London”.
Update the spoofed location based on the aircraft’s actual position and its intended destination, and you can get it to go where you want it.
If the aircraft is trying to fly to London, for example, and you want it to turn to the east of its track, you start spoofing a location west of London. The aircraft thinks it is west of London, and turns to the east to get to spoofed-London.
ADIRUs will throw out bad GPS data if it disagrees with multiple IRUs, hence why there’s usually 3 on the aircraft.
If they’re using the older IRUs, the drift is corrected via redundancy and not GPS. Usually pilots will report drift based on their final IRU coordinates compared against GPS. Even then, they should still be checking their course with VOR.
Pretty much this, look up Kalman filters if you want details. The most likely explanation is that they are tuned to effectively trust GPS more than the internal IMU for long periods of time. Really good IMUs are very expensive and still drift but have high speed output. When it works well, GPS is cheap and doesn’t drift but with a slow update rate. The cost optimisation probably means that the IMU data is usually only trusted for a few seconds, probably 10 min at most before it takes whatever the GPS says as truth. If they lost gps signal through jamming, then they would keep navigation on the less certain IMU data, but the GPS sensor thinks all is well so they shift position.
There is probably a software upgrade to the filter that could be used to limit these attacks, but I imagine it’s an active area or research.
If it’s a smaller plane (such as a CRJ / ERJ) with only one IRU, it will not be able to determine if GPS is valid or not, so the drift correction gets spoiled.
Large commercial aircraft are using 3 IRUs, with newer aircraft using ADIRUs. If GPS does not agree with the three IRUs, the GPS data is thrown out. If the GPS is within tolerance, correction is applied. You could build up very small errors over a long distance, but you should still be pretty close to the airfield when you get there.
Ignore my ignorance. Are you saying the aircrafts track where they are going by calculating their position from gyroscope data? And this is more precise than GPS?
That’s like using the accelaration sensors in your phone to navigate. Or sailing with compass and nautical maps.
Possible. Tech isn’t even that novel. But still impressive.
Yes. Most of commercial navigation systems rely on the IRUs as a primary source of position data, and they’ll usually have 3 of them. VHF is used by the crew to confirm that the aircraft is on track by referencing VOR stations, though these are slowly being phased out due to GPS.
That being said, a single traditional IRU can have up to 2km of drift over a 2 hr flight (at which point it’s removed from service and replaced). When used in combination with two other IRUs, the error is dramatically reduced. Traditional IRUs are gyroscopically mechanical in nature and do not talk to GPS.
Now, that being said, the new standard is called an ADIRU (ADvanced IRU), which ties in with GPS and features laser gyros. They’re extremely accurate and have essentially zero drift, plus multiple redundant components within each unit.
This sounds rather dangerous. GPS was originally opened up to civilian use for the purpose of keeping flights on course, after the disaster of Korean Air Flight 007 straying into Soviet airspace and being shot down back in the 1980s.
I can’t understand what is to be gained by deliberately trying to knock civilian airliners off course.
The GPS chips have internal limits on how fast they think they can move. If they determine that they are moving faster than 300m/s they will stop outputting any results for a period of time. This limit is, IIRC, put in at the silicon level, so only military chips can bypass it.
If you try to use mapping apps on a plane you sometimes run into this issue.
I can’t understand what is to be gained by deliberately trying to knock civilian airliners off course.
You don’t deal with terrorists, do you?
Nobody knows what to do?
How they did between 1890 and 1980? Maybe with paper maps and their eyes? It needs investigating!
The planes first received spoofed GPS signals, meaning signals designed to fool planes’ systems into thinking they are flying miles away from their real location. One of the aircraft almost flew into Iranian airspace without permission
Tomorrow Never Dies continues to be bizarrely relevant.
GPS is old, the amount of data you get from the satellite is small, essentially satellite id and timestamp. If we would redesign this today, you could include a digital signature.
Sure, but… you can google this to verify … one can probably manipulate GPS by introducing delay, i.e. resend data from a sat that was hear some seconds ago. With this signal the location will be off.
Yes Galileo supports encryption. But as far as I know it’s not in use. Has been trialled only. But I know all Airbus aircraft only support GPS satellites and nothing else (yet). I assume Boeing, being American would be the same then.
As far as solutions go, an aircraft can navigate fine without GPS. It can update its position from ground navigation aids and if they are not available it can still Dead Reckon very well. The navigation error very slowly grows until it’s out of the black spot and can use GPS or navigation aid to increase its accuracy. But this navigation error on the time frame of say an hour is a matter of kilometers at most, not dozens.
Easy solution: homing rockets that seek out the strongest signal using that band. Whitelist the sources that are official and proper.
GPS is passive so the rockets won’t go for the plane… it’ll go for the transmission tower.
Use less destructive devices if you’d rather risk sending humans to do the job.
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