Patent ID: 7834621

Claim:
A method for electromagnetic tracking, comprising: generating at least one magnetic field, wherein generating the at least one magnetic field includes sequentially generating at least three different magnetic fields; sensing the at least one magnetic field with at least one scalar-magnetometer, wherein sensing the at least one magnetic field includes: generating a first biasing magnetic field via a first coil disposed proximate the at least one scalar-magnetometer; sensing the at least three magnetic fields in sequence during the generation of the first biasing magnetic field; generating a second biasing magnetic field via a second coil disposed proximate the at least one scalar-magnetometer; sensing the at least three magnetic fields in sequence during the generation of the second biasing magnetic field; generating a third biasing magnetic field via a third coil disposed proximate the at least one scalar-magnetometer; and sensing the at least three magnetic fields in sequence during the generation of the third biasing magnetic field; and determining a relative position of the at least one scalar-magnetometer based on the sensed at least one magnetic field.