Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

Tracing a powerful GNSS interference source over Europe

arxiv.org

Post reply on HN
Print view View original

161–170 of 256 posts

Re: Tracing a powerful GNSS interference source over Europe

#161

Post by Joker_vD »

b65e8bee43c2ed0 wrote: post #155
N19PEDL2 wrote: post #71

Earlier quoted context omitted.

They don't even have internet anymore... https://www.bbc.com/news/articles/cr510de17jlo

[flagged]

"Do not ever give up your guns", har-har. In the guerilla stage of the Second Chechen War one of the ways to deal with the insurgents who would barricade in a building was to drive a T-72 to it and fire a couple of HE shells at it. The house would fold in like, well, a house of cards; I believe there even used to be recorded footage on YT. I imagine a single fragmentation shell would be enough for an average American house. My point is, in the modern days having small firearms is not really going to help you against a government who would be willing to use its military on its own territory; you'd need automatic weapons and artillery at the very least, and a lot of foreign funding and training as well. Even then...

Re: Tracing a powerful GNSS interference source over Europe

#162

Post by scotty79 »

sippeangelo wrote: post #5
yladiz wrote: post #3

Related Veritasium video: https://www.youtube.com/watch?v=tz23G_UXCGA

The theory that they broadcast communication on a band near GPS in order to discourage jamming of their early warning system sounds likely. Flexing the ability to jam GPS is pointless, since it's obvious that any state actor who has military satellites in orbit has considered this option or have the capability already. Therefore, the disruptions must either be regular tests of the capability, or just actual communica…

Even if that's for communication, repurposing it for mass jamming shouldn't be that hard. It already has this effect. Unless it's low power satellites that wouldn't be able to sustain radio signal in anything longer than short bursts.

Re: Tracing a powerful GNSS interference source over Europe

#163

Post by scotty79 »

codedokode wrote: post #151
sippeangelo wrote: post #5

Earlier quoted context omitted.

The theory that they broadcast communication on a band near GPS in order to discourage jamming of their early warning system sounds likely. Flexing the ability to jam GPS is pointless, since it's obvious that any state actor who has military satellites in orbit has considered this option or have the capability already. Therefore, the disruptions must either be regular tests of the capability, or just actual communica…

Why these capabilities, if they exist, were not used to send Iranian drones to a wrong target? Maybe because they do not exist. Israel definitely would be happy if thousands of drones were rerouted to a neighbour country or into the sea.

Are there any credible reports of Iran hitting any intended target smaller than a city? Because the drone doesn't need to have GPS for that.

Re: Tracing a powerful GNSS interference source over Europe

#164

Post by scotty79 »

DumpoLumbo wrote: post #137

I wonder why they call this specific discovery “jamming”. What they found is a relatively rare burst transmissions over roughly 5MHz of spectrum of something looking like a 12ms cyclic prefix with spacing related to 150 seconds multiplies. I would suspect it is some sort of sync or data close to L1 GPS frequencies, that as a side effect causing lower CNR for the GPS receivers. Btw it is only 10dB, which also I can’t…

> I wonder why they call this specific discovery “jamming”.

Because it jamms.

Re: Tracing a powerful GNSS interference source over Europe

#165

Post by mrguyorama »

trumpdong wrote: post #138
labcomputer wrote: post #125

Earlier quoted context omitted.

Err what? No, conventional radio broadcasts can be received with a low noise amplifier and a tuned filter. The received GPS signal, at ground level, is lower than the thermal noise floor. And the 1.023MHz code is modulated on the RF carrier anyway.

> and a tuned filter So correlating it with a sine wavelet?

No? Old AM radio required only rectification. You can receive it with accidental diodes.

Re: Tracing a powerful GNSS interference source over Europe

#166

Post by b65e8bee43c2ed0 »

Joker_vD wrote: post #161
b65e8bee43c2ed0 wrote: post #155

Earlier quoted context omitted.

[flagged]

"Do not ever give up your guns", har-har. In the guerilla stage of the Second Chechen War one of the ways to deal with the insurgents who would barricade in a building was to drive a T-72 to it and fire a couple of HE shells at it. The house would fold in like, well, a house of cards; I believe there even used to be recorded footage on YT. I imagine a single fragmentation shell would be enough for an average American…

what was the outcome of the First Chechen War?

Re: Tracing a powerful GNSS interference source over Europe

#167

Post by throw0101c »

ifwinterco wrote: post #158
mrngld wrote: post #31

Earlier quoted context omitted.

The US still has a fairly robust network of VOR's / VOR with DME / VORTAC stations. Good for navigation, but there's no timing component, beyond what's inherent in how they operate. Admittedly, that'll never be of use outside aviation as its line-of-sight only. But if the sun threw a Carrington event (or worse) at us, I think a lot of western aviation could carry on.

A lot of these were getting dismantled until quite recently, but given recent developments they should obviously be kept

> A lot of these were getting dismantled until quite recently, but given recent developments they should obviously be kept

The FAA has always planned for keeping a non-GNSS-based infrastructure:

* https://www.faa.gov/air_traffic/flight_info/aeronav/acf/medi...

* https://www.federalregister.gov/documents/2012/08/21/2012-20...

* https://download.aopa.org/epilot/2012/120112VOR-MON-White-Pa...

* https://flighttrainingcentral.com/2017/03/legacy-navigation-...

Re: Tracing a powerful GNSS interference source over Europe

#168

Post by throw0101c »

brohee wrote: post #122
throw0101a wrote: post #23

Earlier quoted context omitted.

> Flexing the ability to jam GPS is pointless, since it's obvious that any state actor who has military satellites in orbit has considered this option or have the capability already. Forget "state actors", truck drivers have taken out entire airports with GPS jammers: * https://www.cnet.com/culture/truck-driver-has-gps-jammer-acc... People like the Resilient Navigation and Timing Foundation have been trying for years…

Celestial Navigation is also doable even in daylight nowadays, e.g. https://sodern.com/en/ranges/astradia

Will that come as an option for my RAV4 or F-150? How about my Cessna?

Will it help keep my NTP/PTP masters sync'd?

Re: Tracing a powerful GNSS interference source over Europe

#169

Post by Joker_vD »

b65e8bee43c2ed0 wrote: post #166
Joker_vD wrote: post #161

Earlier quoted context omitted.

"Do not ever give up your guns", har-har. In the guerilla stage of the Second Chechen War one of the ways to deal with the insurgents who would barricade in a building was to drive a T-72 to it and fire a couple of HE shells at it. The house would fold in like, well, a house of cards; I believe there even used to be recorded footage on YT. I imagine a single fragmentation shell would be enough for an average American…

what was the outcome of the First Chechen War?

Why, the Second Chechen War.

Re: Tracing a powerful GNSS interference source over Europe

#170

Post by vardump »

Npovview wrote: post #127
awestroke wrote: post #84

Earlier quoted context omitted.

Russia is the aggressor. What do you propose?

Playing Devil's advocate, given how much firepower Russia has, why is it so soft on Ukraine. I mean what is the endgoal for Russia here? Tire out the US/NATO Empire just as US did to Soviets in Afghanistan. I sometimes feel like all these events are orchestrated as Simon Dixon talks about them in his videos. https://www.youtube.com/@SimonDixon21/videos

Are you joking? Russia has thrown everything it has at Ukraine for quite some time.
Post reply on HN