A system for tracking a probe within an area of operations such as a patient's body comprises a set of primary radiators disposed at known locations. The primary radiators are driven by a control unit to track the positions of a plurality of secondary radiators with respect to the primary radiators....http://www.google.fr/patents/US20040068178?utm_source=gb-gplus-shareBrevet US20040068178 - High-gradient recursive locating system
