I don’t know what airbus uses I only looked into the schematics of commercial avionics like Garmin.
I doubted though IMU drift and calibration introduce more error than they can provide in useful signal, old school pressure sensors + gps adjusted manually or automatically for regional pressure settings (pilots get these numbers through radio when they enter a new pressure area) is accurate enough (~1m). I’ll let a real avionics engineer correct me here, I’d be curious if that signal is worth the hassle + I can imagine such tiny SMD sensors ARE the biggest victims of radiation hallucination.
Yet on the flip side, if I’m trying to auto identify my own phone for a login-less private app i tried to build I couldn’t get to reliably generate a consistent fingerprint on safari private mode, it regenerates 50% of the time, I’ve tried several libraries like fingerprintjs and co..