Position and orientation measuring system having anti-distortion

Details Position and orientation measuring system having anti-distortion Position and orientation measuring system having anti-distortion

1995-06-05

1997-06-17

Le, Hoanganh T.

Communications: radio wave antennas

Antennas

Spiral or helical type

343867, 342448, 324461, H01Q 136, G01S 504, G01B 714

Patent

active

056401701

ABSTRACT:
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 components defining a source reference coordinate frame. A driver applies signals to the source to generate a plurality of electromagnetic fields which are distinguishable from one another and a remote sensor has a plurality of field-sensing elements which sense each of the generated electromagnetic fields. A processor processes the output of the sensor in a remote object position and orientation relative to the source reference coordinate frame. At least one of the field-generating elements of the source has at least one electrically conductive sheet and a planar coil including a plurality of coplanar concentric rings above the conductive sheet. The planar coil is configured in a manner that a signal applied to that coil will cause a current density at each ring that is inversely proportional to the square of the radius of that ring. The planar coil may be made from a conductor formed as a simple or foliated spiral. The planar coil and the electrically conductive sheet may be formed from printed circuit board stock. A dihedral source may be made from a pair of orthogonal electrically conductive sheets each having a planar coil above the sheet. A trihedral source may be made from three electrically conducting sheets each having a planar coil above the sheet.

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Patent Abstracts of Japan, vol. 018, No. 1765 (P-1716), Mar. 24, 1994, and JP A 5340709, Patent Date: Dec. 21, 1993.

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