I need help in setting up an experiment in which there are three fixed non-collinear points and one moveable point all of which exist within a one meter diameter sphere. My goal is to register the position of the moveable point at three minute intervals and then identify when this moveable point moves more than two mm. in any direction from its last registered position. Obstacles within the sphere prevent using optical or acoustic devices. Any suggestions will be appreciated, however my background is more in anatomy than electronic engineering so I may need more detailed help than average. Thanks
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