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Tracing a powerful GNSS interference source over Europe

arxiv.org

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Re: Tracing a powerful GNSS interference source over Europe

#251

Post by Aerroon »

colechristensen wrote: post #231
Aerroon wrote: post #223

Earlier quoted context omitted.

An apple at highway speeds can break the windshield and make the car undriveable. People throwing things from highway overpasses is a serious (and deadly) problem. > A missile intercept for explosions or a kinetic destruction the relative velocity will be measured in kilometers per second. The satellite will also be going kilometers per second. You have to almost match the orbital velocity to have a chance of hitting…

To the contrary, for the 1 satellite missile strike we have public information on, not only did it not catch up to the orbital velocity for intercept, it hit it head on (going the other direction) adding to the relative velocity. A satellite with an ~8 km/s orbital velocity was struck head on by a missile adding to that by ~2 km/s for a total just under 10 km/s. It is indeed not that hard to intercept something in or…

I see. I'm actually more impressed by a head on intercept for the current anti-satellite missiles and that definitely makes the idea unworkable.

Re: Tracing a powerful GNSS interference source over Europe

#252

Post by throwaway2037 »

yladiz wrote: post #3

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

Even if you think the information density of YouTube videos is too low (many do on HN), I can confidently say that the visuals are outstanding for (a) how GNSS/GPS works and (b) how they pinpoint'ed the satellite.

Re: Tracing a powerful GNSS interference source over Europe

#253

Post by throwaway2037 »

embedding-shape wrote: post #69
Scroll_Swe wrote: post #52

Earlier quoted context omitted.

Russia is constantly GPS jamming EU. https://www.bbc.com/news/articles/clyx3ly54veo So funny seeing non-EU people and/or people friendly to Russia comment (not you) Carry on!

Yeah, same with traveling by boat in the Baltic Sea, been continuously GPS-jammed since 2022 or something annoying like that, basically the entire South East-coast of Sweden been unnavigatable with GPS since then.

    > basically the entire South East-coast of Sweden been unnavigatable with GPS since then
This is an interesting first-hand account. If GPS is unreliable, how do you navigate? Perhaps: (1) Only daylight hours and use landmarks? (2) Can modern boat navigation systems estimate your location based upon measured speed and compass direction?

Re: Tracing a powerful GNSS interference source over Europe

#254

Post by throwaway2037 »

pelorat wrote: post #221
colechristensen wrote: post #10

Earlier quoted context omitted.

>I wonder if we can do something now that we know the source. Russia signed the 1967 Outer Space Treaty (OST) in 1967, this may be a treaty violation of this or other treaties, something like that or retaliation regarding it may be possible. You can hack the satellite, or use other electronic warfare options to jam or interfere with it's operations. You can shoot it down with a missile. The X-37B is in space right no…

Like the USA, I don't think Russia codifies treaties into law. Like in the USA, treaties for Russia are mere suggestions used as a geopolitical tool until inconvenient.

This does not follow my understand of treaties signed and ratified by the US.

    > Domestic Enforcement: If the treaty is self-executing, its provisions automatically become part of federal law under the Constitution’s Supremacy Clause. If it is non-self-executing, Congress must draft and pass implementing legislation to establish domestic enforcement.
I know much less about treaties signed and ratified by Russia, but I found this:

    > Russia codifies international treaties into domestic law through the formal ratification process. Under Article 15(4) of the Constitution of the Russian Federation, ratified treaties are considered an integral part of the Russian legal system, provided they do not conflict with domestic constitutional principles.

Re: Tracing a powerful GNSS interference source over Europe

#255

Post by throwaway2037 »

gpm wrote: post #65
LiamPowell wrote: post #26

Earlier quoted context omitted.

> especially with all the stuff that SpaceX has put into orbit in recent years I've heard this repeated a lot but I've never seen anyone do the maths. StarLink satellites are all in very low orbits, so intuitively it seems like most debris from a collision would just end up deorbiting.

90% of starlink satellites are >400km in altitude. They aren't in very low earth orbits where that intuition even might be correct. They're above the space station. I've definitely seen math done - though I'd have to dig it up again. I think in FAA filings.

I agree with part of your response.

The best sources that I can find say that Starlink sats orbit around 550 km above Earth. By all accounts, this distance is well within Low Earth Orbit definitions. However, you used the term "very low earth orbits". I never heard before and needed to research it. It is a neologism from 2017 and does not seem to have a precise definition. Most uses indicate less than 450 km above Earth.

The International Space Station flies around 400 km above Earth.

Re: Tracing a powerful GNSS interference source over Europe

#256

Post by Hundredth0006 »

N19PEDL2 wrote: post #71
Havoc wrote: post #34

Earlier quoted context omitted.

>must surely be impacting the Russian residents as well, right? They don't give a fuck. Was watching a youtube video by a russian the other day talking about war & sanction impact and things like ride sharing apps literally say on screen the location is going to be wrong and to select pickup spot manually. It's just assumed to be fucked as a given even at an app development level

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

We do. And my VPN is not even turned on now to write this comment
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