Can 9DOF IMU tech ~accurately locate an athlete in an enclosed space


hi,
realising return topic quite hashed out since 2011 or so, apologise in advance.

however, now, 2017, after advent of ubiquitous quadcopter revolution i'm wondering if recent advances in tech have made possible track , locate moving person carring/wearing 9dof imu reasonable degree of accuracy, standing start completion of stop-start movement on period of, say, 15 minutes.

the idea sensor pack given wearer prior commencement of 15min, , data collected wirelessly during his/her progress through course.  data points - spatial locations - in plane i'm looking (i.e. grid reference) whereby actions taken @ locations have direct bearing on "progress" being made athlete.
 
the person walking or running point point , standing - standing not immobile - when waypoint measured, triggered athlete hitting button on pack, in turn triggers action @ waypoint. athlete chooses point he/she stops @ carry out task, distance "goal" going variable need measure.
example:
alan starts @ start , runs toward "goal1":  when gets feels can accomplish task (think throwing ball through hoop example) stops, hits button , "goal" becomes available him.  if he's 2 meters away scores less if he's 5m away.  hence need positional data @ button press.  "goal1" completed proceeds ,walking or running (his choice speed v accuracy becomes factor) "goal2".  rinse, repeat.
 
accuracy of 1 metre on 50x50m course - can near this, or better?

has managed nail kind of analysis degree of success?



 

due dynamic rates of change active person, suspect low-end arduino might not able keep in real time maintain 3d spatial awareness/integrity on 15 mins straight.
interesting project.


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