North Korean GPS Jamming
reports on trials carried out by the lighthouse authorities. Interesting reading
Maritime Jamming Trial Shows GPS Vulnerabilities | GPS World
Maritime Jamming Trial Shows GPS Vulnerabilities | GPS World
The other part of the problem was me for not reading the warning on the chart...
Not exactly jamming related, but in 1995, long after GPS was first fitted to our aircraft, it was revealed an ambiguity in the wording of a key GPS specification meant manufacturers were implementing it wrongly. The effect was cumulative errors built up over time (during a single flight).
The first MoD aircraft modified to correct this only entered service in 2002.
I remember when this was notified to other aircraft offices most ignored it. Nothing was done to establish which systems were correct and which were wrong. This also raised an interesting question - the Failure Modes and Effects Analysis. Some offices reckoned the GPS unit in the aircraft would fail more often, so concentrated on providing more, instead of reverting to other NavAids. Others reckoned the main failure mode would be loss of satellite signal, multiple aircraft units would be useless, so concentrated on other backup systems. I always thought the latter a more sensible approach, given we didn't control the satellites. This simply highlights that, not very long ago, GPS was very immature. For example, it wasn't cleared for use in the Chinook Mk2 in 1994, despite having been fitted in the Mk1 some years earlier. You were allowed to switch it on, but not rely upon it in any way. I dare say there is still much to learn.
The first MoD aircraft modified to correct this only entered service in 2002.
I remember when this was notified to other aircraft offices most ignored it. Nothing was done to establish which systems were correct and which were wrong. This also raised an interesting question - the Failure Modes and Effects Analysis. Some offices reckoned the GPS unit in the aircraft would fail more often, so concentrated on providing more, instead of reverting to other NavAids. Others reckoned the main failure mode would be loss of satellite signal, multiple aircraft units would be useless, so concentrated on other backup systems. I always thought the latter a more sensible approach, given we didn't control the satellites. This simply highlights that, not very long ago, GPS was very immature. For example, it wasn't cleared for use in the Chinook Mk2 in 1994, despite having been fitted in the Mk1 some years earlier. You were allowed to switch it on, but not rely upon it in any way. I dare say there is still much to learn.
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GPS is one of the core technologies in western defense.
So influencing it has for sure a lot of attraction for any potential adversary.
Brute force direct jamming might be the easiest thing to deal with. At least you notice that you have a problem.
A more nastier way will be some kind of deception. I remember reading once a article about jamming that said "the most effective jamming is when the target doesn't know its being jammed".
For example many guided weapons rely on GPS guidance. i am not confident that these computer are smart enough to detect some subtitle jamming that messes up thier guidance just enough to miss thier target by lets say a mile.
So influencing it has for sure a lot of attraction for any potential adversary.
Brute force direct jamming might be the easiest thing to deal with. At least you notice that you have a problem.
A more nastier way will be some kind of deception. I remember reading once a article about jamming that said "the most effective jamming is when the target doesn't know its being jammed".
For example many guided weapons rely on GPS guidance. i am not confident that these computer are smart enough to detect some subtitle jamming that messes up thier guidance just enough to miss thier target by lets say a mile.
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In the early 90s the offshore helicopter industry used Decca as the prime area navaid. The Rnav box had a facility for GPS but in 1994 only one aircraft was fitted as a trial. There was no reason to think that Decca would not continue ad infinitum as equiping all the fleet would cost a lot of money.
Then they closed down the Decca chains...............................
Then they closed down the Decca chains...............................
Meaconing was often used by the commies in an attempt to lure aircraft off track when flying through the three, I think, corridors to and from Berlin.
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Appears that the ROK media's comms were garbled:
I/C
No U.S. plane forced down by North Korea jamming: source
Reuters Sat Sep 10, 2011
A U.S. defense official denied on Saturday that a military reconnaissance plane was forced to make an emergency landing in March because of North Korean GPS jamming, as reported by a South Korean newspaper.
"We have no indication that any aircraft at the time of, or in the vicinity of, this alleged incident was forced to land on an emergency basis," the defense official said, speaking on condition of anonymity.
The Chosun Ilbo newspaper, quoting a South Korean Defense Ministry report, said on Friday the U.S. aircraft had been involved in military exercises.
It said the North Korean jamming signals also disrupted the global positioning system (GPS) devices of coastal patrol boats and speed boats of the South Korean Navy. Several civilian aircraft were affected.
There are about 28,000 U.S. troops based in South Korea and the U.S. and South Korean militaries hold regular joint drills. The two Koreas are still technically at war, having only signed a truce, not a peace treaty, to end the 1950-53 Korean War.
Reuters Sat Sep 10, 2011
A U.S. defense official denied on Saturday that a military reconnaissance plane was forced to make an emergency landing in March because of North Korean GPS jamming, as reported by a South Korean newspaper.
"We have no indication that any aircraft at the time of, or in the vicinity of, this alleged incident was forced to land on an emergency basis," the defense official said, speaking on condition of anonymity.
The Chosun Ilbo newspaper, quoting a South Korean Defense Ministry report, said on Friday the U.S. aircraft had been involved in military exercises.
It said the North Korean jamming signals also disrupted the global positioning system (GPS) devices of coastal patrol boats and speed boats of the South Korean Navy. Several civilian aircraft were affected.
There are about 28,000 U.S. troops based in South Korea and the U.S. and South Korean militaries hold regular joint drills. The two Koreas are still technically at war, having only signed a truce, not a peace treaty, to end the 1950-53 Korean War.
I don't own this space under my name. I should have leased it while I still could
A couple of years ago there was a trial off Flamborough Head. A vessel was manoevred just off the coast and subjected to GPS jamming. Basically a false signal was introduced that gave a false position. The GPS track passed overland - obviously had the ship relied on GPS it would have gone further offshore but the implication was obvious. (Open source)
Then you can use differential GPS where raw GPS is monitored with external sources. I guess in a way that a car sat nav system used this process with its snap-to-road software.
An Australian author has written a novel about a mership transitting the narrows in Indonesia. It was using differential GPS but priates were using a false beacon to seduce the GPS. Raw GPS would have revealled the correct position.
Many years ago a cruise liner ran aground. It had left Bermuda for New York. On departure the signal man had tripped on the GPS Antenna cable and it was disconnected. No one noticed the navigation display flashing DR for the next 2-3 days. When they made radar contact with the land they 'matched' the radar image to the erroneous nav display and convinced themselves they were on track. They ran aground.
In other words there is no substitute for proper navigation techniques.
Then you can use differential GPS where raw GPS is monitored with external sources. I guess in a way that a car sat nav system used this process with its snap-to-road software.
An Australian author has written a novel about a mership transitting the narrows in Indonesia. It was using differential GPS but priates were using a false beacon to seduce the GPS. Raw GPS would have revealled the correct position.
Many years ago a cruise liner ran aground. It had left Bermuda for New York. On departure the signal man had tripped on the GPS Antenna cable and it was disconnected. No one noticed the navigation display flashing DR for the next 2-3 days. When they made radar contact with the land they 'matched' the radar image to the erroneous nav display and convinced themselves they were on track. They ran aground.
In other words there is no substitute for proper navigation techniques.
Pontius, I agree with this. Technology has to be applied appropriately. Differential GPS was first fitted to / used with MoD UK aircraft in 1994, but that doesn't mean all of them need it.
There is a lot of misunderstanding about GPS and what it does. You need only look at the ZD576 BoI report and subsequent MoD statements to the effect that, because the GPS input to SuperTANS was seemingly working, that meant the entire Nav system was both accurate and serviceable. They never did retract this.
There is a lot of misunderstanding about GPS and what it does. You need only look at the ZD576 BoI report and subsequent MoD statements to the effect that, because the GPS input to SuperTANS was seemingly working, that meant the entire Nav system was both accurate and serviceable. They never did retract this.
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Military jamming of GPS in Scotland suspended - 10 Oct 11
Jamming of global positioning signals (GPS) during Europe's largest military exercise has been suspended, following complaints from fishermen.
The Royal Navy issued warnings in September and October that GPS in parts of Scotland would be disrupted during Exercise Joint Warrior.
But Western Isles fishermen said the first they knew was when their equipment went offline last Friday.
The Royal Navy issued warnings in September and October that GPS in parts of Scotland would be disrupted during Exercise Joint Warrior.
But Western Isles fishermen said the first they knew was when their equipment went offline last Friday.
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Anyone know anything about the actual electronics involved in generating erroneous GPS readings?
It's just that I use a GPS on the golf course, as do number of my playing partners. It would be a little bit sad if their GPS's gave a distance to the green of 120 metres when it was actually only 90. The jamming device would have to be locally controllable as one wouldn't want to disrupt one's own device at a critical moment.
It's just that I use a GPS on the golf course, as do number of my playing partners. It would be a little bit sad if their GPS's gave a distance to the green of 120 metres when it was actually only 90. The jamming device would have to be locally controllable as one wouldn't want to disrupt one's own device at a critical moment.
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alisoncc
put one of these in your pocket and turn it on / off at the the critical moment
Mini Portable Cellphone & GPS Jammer J-260B [J-260B] - £60.00 : jammer4u.co.uk
Portable GPS Signal Blocker Jammer [J-260C] : jammer4u.co.uk
or even better, try this
Mini Portable Cellphone Jammer J-260A-PRO [J-2600A-PRO(Latest design)] - £99.10 : jammer4u.co.uk
Note that these are apparently legal to own, but illegal to use....
put one of these in your pocket and turn it on / off at the the critical moment
Mini Portable Cellphone & GPS Jammer J-260B [J-260B] - £60.00 : jammer4u.co.uk
Portable GPS Signal Blocker Jammer [J-260C] : jammer4u.co.uk
or even better, try this
Mini Portable Cellphone Jammer J-260A-PRO [J-2600A-PRO(Latest design)] - £99.10 : jammer4u.co.uk
Note that these are apparently legal to own, but illegal to use....
Last edited by jamesdevice; 12th Oct 2011 at 21:23.
