A method and apparatus for determining the position and orientation of a remote object relative to a reference coordinate frame includes providing a source having a plurality of field-generating elements, wherein the field-generating elements generate electromagnetic fields and have spatially independent...http://www.google.es/patents/US5640170?utm_source=gb-gplus-sharePatente US5640170 - Position and orientation measuring system having anti-distortion source configuration
Position and orientation measuring system having anti-distortion source ...
