Without GPS: EU researchers develop satellite-independent navigation system
Without GPS: EU researchers develop satellite-independent navigation system
cross-posted from: https://europe.pub/post/54802
And what is Galileo supposed to be then?
It's the same as GPS (American) or Glonass (Russian). Satellite based positioning, which is vulnerable to jamming. It could also be turned off, just like the others, hence the need for an alternative.
which is vulnerable to jamming
This has, in fact, been a serious problem in the Baltic region, as Russia's military has been jamming GPS there for some time, and it dicks up navigation for ships and aircraft there.
Yes, a search for 'GPS jamming Baltic' turns up hits from everything from DW to the Financial Times.
It's a problem for maritime and aviation navigation, and a problem for both sides in the war in Ukraine. Some drones are now using fiber optic tethers to get around the jamming, that's not much of an option for civilian traffic though.
Upon actually investigating the article, it appears to mention it as well. :-)
Is this new system, R-Mode, invulnerable to jamming? It uses radio spectrum, so I'd think not, but it's not mentioned in the article.
I'm sure not, but even without looking at any technical details, it will have at least a couple benefits:
Nitpick: GPS satellites are not in geosynchronous orbit and are at about 12,540 miles up.
https://en.m.wikipedia.org/wiki/Global_Positioning_System
Doesn't really negate your point, though. That's still a lot further away than a ground based system would be.
GPS and Galileo satellites are in MEO, not GEO. GEO is a very specific altitude to keep a satellite directly over the same spot on Earth at all times (synced to the spin of Earth). MEO, on the other hand, is a wide range of altitudes roughly half the altitude of GEO. GPS sits right around 9800 nautical miles, which is 11200 miles. That's still really far away, so your point stays the same. Galileo is in a similar orbit, I think around 200 miles lower but I can't remember. GLONASS is there, too. Beidou from China has birds in both MEO and GEO. QZSS from Japan uses one GEO bird and three birds in a highly inclined orbit at GEO altitude.
Your two points are good. I think a third point would be that this is a different RF spectrum, while GPS and Galileo are on roughly the same RF spectrum. Jamming GPS and Galileo at the same time isn't difficult. Jamming a very different RF spectrum at the same time is much harder.
Regarding the second point, militaries have a long history of using civilian products (see GPS in the gulf war for example) if they don't have enough of the expensive stuff, which will lead to incentive to jam the civilian stuff as well. The article suggests that this system should be more resilient against simple jamming though.
It's a satellite based nav system. This would be a new development that is presumably ground based.
The same thing its been for the last 20 years?
I don't seem to understand your question.
