4 ms·
Even before that, there was a Google Maps experiment using the compass (magnetometer) to infer train movement, but IIRC the accuracy of that depended on the net
by the-rc 2y ago
Even before that, there was a Google Maps experiment using the compass (magnetometer) to infer train movement, but IIRC the accuracy of that depended on the network's current (DC vs AC) and even the vintage of the cars.
- mapt 2y agoThing about training sensor fusion algorithms - more sensors, more better. Often adding a terribly inaccurate sensor whose failures are uncorrelated with the ones you're currently using, because it operates on an unrelated principle, is the thing that makes the solution highly accurate.