Patent ID: 6172499
Filing Date: 2001-01-09
Classification: A61B,F41G,G01B,G01D

Abstract:
A device for measuring the position of receiver antennas relative to transmitter antennas comprising:a) transmitter antenna means comprising at least two aparallel antennas adapted to generate at least two AC magnetic field vectors, said fields exhibiting at least two frequency components;b) receiver means comprising at least two aparallel sensors adapted to detect said AC magnetic field vectors;c) a first number of transmitter antennas multiplied by a second number of receiver sensors being at least equal to a total number of degrees of freedom of a desired measurement of position of the receiver means relative to the transmitter antennas;d) signal processing means for ascertaining magnitude of detected AC magnetic field vectors, said signal processing means computing magnitudes of at least two detected AC magnetic field vectors with relative values of phase separated components of said field vectors being employed by said signal processing means to correct detected said AC magnetic field vectors to substantially eliminate position errors caused by eddy current distortion.