Other than computer vision, the most accurate positioning method is "ultra wideband" (UWB). It's possible to get close to cm accuracy, but it can be expensive.

Other than computer vision, the most accurate positioning method is "ultra wideband" (UWB). It's possible to get close to cm accuracy, but it can be expensive. There is also a calibration problem: if the readers get bumped or moved, then you may have to recalibrate the system. UWB uses time distance of arrival instead of RF triangulation, so it's extremely accurate, and you can get to 100 Hz. You can check out a few examples: http://pluslocation.com http://pluslocation.com http://www.timedomain.com/ http://www.timedomain.com/ or google for: ultra wideband real time location If you have specific questions I'd be happy to help - contact info is in my profile.