Patent ID: 6754609
Filing Date: 2004-06-22
Classification: F41G,G01B

Abstract:
A device for measuring position and the orientation of a mobile object with respect to a fixed structure, in a disturbed magnetic environment, comprising:a first assembly of at least two first orthogonal coils configured to emit at least one predetermined magnetic field, secured to the fixed structure, and defining a reference frame; a second assembly of at least two second orthogonal coils configured to receive at least one magnetic field, secured to the mobile object, and forming a sensor, each of the second coils belonging to a channel of the sensor; means for simultaneous and continuous emission of predetermined magnetic fields, on each of the first coils of the first assembly; first means of measuring, on each of the channels of the sensor, a vector sum of the predetermined magnetic fields emitted and of disturbing fields produced by the environment of the device; means of evaluating the disturbing fields; first means of estimating the predetermined-magnetic fields emitted in an undisturbed magnetic environment, by eliminating the disturbing fields evaluated in the vector sum; and means for calculating a position and orientation of the first object in reference frame, from the estimation of the predetermined magnetic fields.