3 ms·
Read 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
by bhousel 14y ago
Read 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.