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GPS signal disturbed at altitudes above 2000-3000 feet over Norway [pdf]

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Re: GPS signal disturbed at altitudes above 2000-3000 feet over Norway [pdf]

#11

Post by rz2k »

johansch wrote: post #3

I experienced a very odd GPS failures about a week later (September 24) in south-eastern Sweden. At one point I was driving for about an hour (in quite isolated areas - around https://www.google.com/maps/@58.0381615,16.2094966,13.37z ) without my iphone being able to get a gps fix. It's never happened before, or since. The phone was fixed to the car's front window with plenty of sight towards the sky. I rebooted the…

The iPhone 4S and newer models also use GLONASS along with GPS for positioning. I suppose they could also encrypt their own system with a different scheme in unique situations.

Re: GPS signal disturbed at altitudes above 2000-3000 feet over Norway [pdf]

#12

Post by mshook »

johansch wrote: post #8
gchokov wrote: post #7

Earlier quoted context omitted.

They are doing this in bigger Russian cities. GPSes often doesn't work in downtown Moscow or St. Petersburg. There's plenty of information available on the internet about this. Also, they have their own positioning system, that is also available worldwide - Glonass

Care to link to any of that information?

Stuff like: https://themoscowtimes.com/articles/the-kremlin-eats-gps-for... http://money.cnn.com/2016/12/02/technology/kremlin-gps-signa...

Re: GPS signal disturbed at altitudes above 2000-3000 feet over Norway [pdf]

#13

Post by ISL »

UncleEntity wrote: post #10

There was massive solar flare activity in September which may (or may not) have something to do with this.

It is the rare natural phenomenon that can make 1 MHz-wide bandstopped white noise, centered exactly on a human-chosen navigational frequency of import.

Re: GPS signal disturbed at altitudes above 2000-3000 feet over Norway [pdf]

#14

Post by netsharc »

johansch wrote: post #3

I experienced a very odd GPS failures about a week later (September 24) in south-eastern Sweden. At one point I was driving for about an hour (in quite isolated areas - around https://www.google.com/maps/@58.0381615,16.2094966,13.37z ) without my iphone being able to get a gps fix. It's never happened before, or since. The phone was fixed to the car's front window with plenty of sight towards the sky. I rebooted the…

I would assume the US/NATO also jams GPS/use some sort of scrambler for the unencrypted signal to have some military advantage...

Re: GPS signal disturbed at altitudes above 2000-3000 feet over Norway [pdf]

#15

Post by johansch »

netsharc wrote: post #14
johansch wrote: post #3

I experienced a very odd GPS failures about a week later (September 24) in south-eastern Sweden. At one point I was driving for about an hour (in quite isolated areas - around https://www.google.com/maps/@58.0381615,16.2094966,13.37z ) without my iphone being able to get a gps fix. It's never happened before, or since. The phone was fixed to the car's front window with plenty of sight towards the sky. I rebooted the…

I would assume the US/NATO also jams GPS/use some sort of scrambler for the unencrypted signal to have some military advantage...

Yeah, it's also possible that it was the Swedish armed forces/NATO doing the jamming as part of the exercise. In this case they would probably jam both GPS and GLONASS.

Seems politically quite risky though, what if some ambulance didn't reach their target or something like that? (Although I guess an easy workaround for that could have been tight coordination with the local rescue services - stop the jamming the moment there's an ambulance/fire emergency in the local area.)

Re: GPS signal disturbed at altitudes above 2000-3000 feet over Norway [pdf]

#16

Post by johansch »

rz2k wrote: post #11
johansch wrote: post #3

I experienced a very odd GPS failures about a week later (September 24) in south-eastern Sweden. At one point I was driving for about an hour (in quite isolated areas - around https://www.google.com/maps/@58.0381615,16.2094966,13.37z ) without my iphone being able to get a gps fix. It's never happened before, or since. The phone was fixed to the car's front window with plenty of sight towards the sky. I rebooted the…

The iPhone 4S and newer models also use GLONASS along with GPS for positioning. I suppose they could also encrypt their own system with a different scheme in unique situations.

(I was using an iPhone 5s.)

Re: GPS signal disturbed at altitudes above 2000-3000 feet over Norway [pdf]

#17

Post by Cyph0n »

netsharc wrote: post #14
johansch wrote: post #3

I experienced a very odd GPS failures about a week later (September 24) in south-eastern Sweden. At one point I was driving for about an hour (in quite isolated areas - around https://www.google.com/maps/@58.0381615,16.2094966,13.37z ) without my iphone being able to get a gps fix. It's never happened before, or since. The phone was fixed to the car's front window with plenty of sight towards the sky. I rebooted the…

I would assume the US/NATO also jams GPS/use some sort of scrambler for the unencrypted signal to have some military advantage...

I think the US military uses a different GPS signal that provides higher accuracy positioning.

Re: GPS signal disturbed at altitudes above 2000-3000 feet over Norway [pdf]

#18

Post by johansch »

Cyph0n wrote: post #17
netsharc wrote: post #14

Earlier quoted context omitted.

I would assume the US/NATO also jams GPS/use some sort of scrambler for the unencrypted signal to have some military advantage...

I think the US military uses a different GPS signal that provides higher accuracy positioning.

The RF signal is the same, the additional accuracy comes from the use of cryptography.
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