4 ms·
What happens if there are large items which move and cause changes in the localised magnetic field readings? Things such as lifts, vehicles, regularly changing
by dazbradbury 14y ago
What happens if there are large items which move and cause changes in the localised magnetic field readings?
Things such as lifts, vehicles, regularly changing stock levels... Or are these all considered negligible?
- FrojoS 14y agoI have the exact same question. I use magnetometers with IMU's as part of my research and temporal disturbances of the magnetic field are a huge problem. Anyway, this new method sounds awesome. Thanks for posting!
- bhousel 14y agoRead the link in pierrebouchet's comment: http://news.ycombinator.com/item?id=4217838 http://news.ycombinator.com/item?id=4217838 From 5.4.3, it actually looks like this kind of magnetic positioning system works better in an indoor environment with lots of magnetic perturbations. This method measures where the person has moved, not where they currently are against a fixed constellation (like GPS). I'm guessing you would need to activate the data collection at a known waypoint (e.g. the front door of a business) and then it could track your movements around a magnetically perturbed space.
- pvarangot 14y agoThose are stationary perturbations they are talking about, the ones they use to map the region. Your parent refers to moving perturbations, such as vehicles or electric motors. An underground mine is really really really different to a subway network if you are only looking at it magnetically.
- crisnoble 14y agoThe demo in this video (https://www.youtube.com/watch?v=uoWs0c5TeTA&feature=player_embedded https://www.youtube.com/watch?v=uoWs0c5TeTA&feature=play...) seems to handle carts moving around pretty well.