maybe the answer is as easy as "could the opel have bee produced in Slovenia, Chec republic, poland or ukraine - thought for the EEU market … but with the whole covid / supply chain craziness some productions have been redirected to other countries to speed up delivery?
As an aside question: Can GPS, GLONASS, Galileo, and Beidou be mixed on the user’s side? I know there are devices that are compatible with moire than one of these systems and will use whatever they get a better signal from. But it’s one thing to use GPS in one case and GLONASS in another, based on whatever is available at that moment; it’s another thing to use some GPS satellites and some GLONASS satellites in the same instance of localisation alongside each other. Is this done? Can this be used to increase accuracy beyond the technical limitations built into either system?
It uses all of them at the same time; see post #13 for proof! Basically, all it has to do is receive enough data to compute its distance from each satellite. To overcome technical limitations, I believe you need tricks like differential GPS, RTK GPS/ CPGPS, etc.
And if you want to see which sats you are using and where they are in your sky, google GPS test app. You’ll find several for Apple and Android.
Thanks, good idea. I’ll see if I find one that I can use for the navigator in the rented car, if I can get the rights (admin?) to install an app on it.
Once you get past the reception and coding mechanism used for getting sync for a satellite the rest of the mathematics is the same no matter what satellite is the source. Selective availability is no longer used on GPS, so there is no deliberate degradation of the signal there. Galileo never had it. However there are different tiers of accuracy possible - largely due to measures to correct for propagation differences through different ionosphere conditions. The P channel on GPS, which allows correction, is not available to civilian users. The equivalent on GLONASS is now fully available. But no system deliberately degrades accuracy anymore. You get what the physics allows.
Overall, the more satellites the better, and you will improve.
Very good thought. Probably the most likely.