Might be worth some degree of suspicion around including GLONASS as a part of GNSS. Russia could create worldwide issues if they decided to fuck around with their constellation.
It would probably be easier for them to mess with it and not affect themselves than it is with GPS and Galileo.
I feel like these planes should be able to fall back on other GNSS. Like Galileo, GLONASS, or even BeiDou.
I'm betting on Russia being the culprit
How do you stop a jammer like this, short of turning off the transmitters responsible for it?
You can't. Think of it like two radio stations that are too close. It doesn't matter how good of a receiver you have it will only ever pick up the signals being transmitted. And when there is noise on the frequency then that is what it will pick up.
Best way to mitigate is have an inertial system. It's a calculator that, based on where you are and where you're heading, keeps track of your updated position.
The math is not that crazy, but with enough time the sensors errors crop up and you'll be slightly off course, then a bit, then a lot.
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