Device for quantitatively measuring the relative position and orientation of two bodies in the presence of metals utilizing direct current magnetic fields
Patent 4849692 Issued on July 18, 1989. Estimated Expiration Date: 
October 9, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 9, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3027951 Device for measuring the location, the attitude and/or the change in location or, respectively, attitude of a rigid body in space Device for the measurement of the location, the position and/or the change of location or of position of a rigid body in space Device applicable to direction finding for measuring the relative orientation of two bodies Magnetic position and orientation measurement system Patent #: 4622644 InventorAssigneeApplicationNo. 06/917389 filed on 10/09/1986US Classes:324/207.26, Approach or retreat324/207.16, Electrically energized324/207.17, Separate pick-up342/451By computerExaminersPrimary: Eisenzopf, Reinhard J.Assistant: Snow, Walter E. Attorney, Agent or FirmInternational ClassesG01B 7/14 (20060101)G01B 7/004 (20060101) F41G 3/22 (20060101) F41G 3/00 (20060101) AbstractA device for quantitatively measuring the relative position and orientation of two bodies in the presence of metals via measuring the position and orientation of receiving antennae with respect to transmitting antennae utilizing direct current electromagnetic field signals is hereby disclosed. The transmitting and receiving components of the instant device consist of two or more separate transmitting antennae of known position and orientation with respect to each other. Each transmitting antenna is driven one at a time by a pulsed, direct current signal. The receiving antennae measure the values of transmitted direct current magnetic fields one dimension at a time and those of the Earth's magnetic field as well, one dimension at a time. A computer is used to control circuit elements of the transmitting and receiving elements of the device and likewise functions to convert received signals into position and orientation outputs after having first effected a subtraction out of the overall value of the Earth'magnetic field.Other References
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