5 ms·
So it measures the difference from zero in the accelerometer signals when the foot is planted and then accounts for that when the foot is moving?
by mapmap 9y ago
So it measures the difference from zero in the accelerometer signals when the foot is planted and then accounts for that when the foot is moving?
- IshKebab 9y agoYes, but that technique isn't new either. Here's a 2014 paper that cites a 2009 paper about it (I didn't follow the trail): https://www.omicsonline.org/open-access/understanding-the-performance-of-zero-velocity-updates-in-memsbased-pedestrian-navigation-0976-4860-5-53-60.pdf https://www.omicsonline.org/open-access/understanding-the-pe...
- mapmap 9y agoBut there is still going to be cumulative error and drift, right? Has this system reduced the cumulative error so that in some pedestrian use cases it is accurate enough?
- AstralStorm 9y agoBoth. Long term drift will be extra challenging to correct as the cumulative error is staircase. (Beta distribution) What this is is actually a step counter, combined with step length and heading estimate from an accelerometer w/ gyroscope plus compass. When the counter makes a mistake, the effects will be catastrophic.