1
Ernest B Blood: Device for quantitatively measuring the relative position and orientation of two bodies in the presence of metals utilizing direct current magnetic fields. Ascension Technology Corporation, Davis Bujold & Streck, July 31, 1990: US04945305 (472 worldwide citation)

A device for measuring the position (location and orientation), in the six degrees of freedom of receiving antennae (3) with respect to transmitting antennae (2) utilizing pulsed DC magnetic signals. The transmitting and receiving components consist of two or more transmitting antennae of known loca ...


2
Ernest B Blood: Device for quantitatively measuring the relative position and orientation of two bodies in the presence of metals utilizing direct current magnetic fields. Ascension Technology Corporation, Anthony G M Davis, Michael J Bujold, John J Welch Jr, July 18, 1989: US04849692 (330 worldwide citation)

A 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 t ...


3
Westley Ashe: Eddy current error-reduced AC magnetic position measurement system. Ascension Technology Corporation, H Jay Spiegel, January 9, 2001: US06172499 (277 worldwide citation)

A device is disclosed for measuring the position (location and orientation) in the six degrees of freedom of a receiving antenna with respect to a transmitting antenna utilizing multiple frequency AC magnetic signals. The transmitting component consists of two or more transmitting antenna of known l ...


4
Ernest B Blood: Device for measuring position and orientation using non-dipole magnet IC fields. Ascension Technology Corporation, Davis and Bujold, February 4, 1997: US05600330 (235 worldwide citation)

Position and orientation of receiving antennae with respect to magnetic field transmitting antennae are determined. The transmitter consists of two or more antenna whose dimensions are large compared to the distance to the receiver. The receiver consists of two or more antenna that are sensitive to ...


5
Maciej Orman: Optical 6D measurement system with three fan-shaped beams rotating around one axis. Ascension Technology Corporation, H Jay Spiegel, June 16, 1998: US05767960 (231 worldwide citation)

A system for the determination of the distance and orientation of an object carrying at least three light sensors from a fixed reference point when the object is irradiated by at least three modulated scanning beams of known angular orientation, and rotational frequency. Timing circuitry located in ...


6
Per Krogh Hansen: Magnetic motion tracker with transmitter placed on tracked object. Ascension Technology Corporation, H Jay Spiegel, April 28, 1998: US05744953 (209 worldwide citation)

The motion of a person is measured in real time using magnetic fields. A magnetic transmitter and a number of magnetic receivers are placed at different points on the person. The transmitter transmits magnetic fields sequentially from three orthogonal coils. The magnetic field is received at each re ...


7
Per Krogh Hansen: Hybrid motion tracker. Ascension Technology Corporation, H Jay Spiegel, November 3, 1998: US05831260 (206 worldwide citation)

A hybrid motion tracker captures the motion of a person. Magnetic field sensors and optical sources are placed on a person, each located on different limbs. A fixed transmitter emits electromagnetic energy and infrared light is transmitted from the optical light sources to the fixed optical sensors. ...


8
Westley S Ashe: Magnetic field permeable barrier for magnetic position measurement system. Ascension Technology Corporation, H Jay Spiegel, June 12, 2001: US06246231 (195 worldwide citation)

A magnetic field position and orientation measurement system contains, confines and re-directs the magnetic field from one or more transmitters such that the fields are attenuated in areas outside of the operating volume in areas where metallic objects are commonly found. A thin barrier made of a hi ...


9
Per Krogh Hansen, Westley S Ashe: Magnetic field position and orientation measurement system with dynamic eddy current rejection. Ascension Technology Corporation, H Jay Spiegel, June 16, 1998: US05767669 (195 worldwide citation)

The position and orientation of remote sensors is determined using pulsed magnetic fields generated from a fixed location. Pulsed magnetic fields are sequentially generated from a plurality of spatially independent components defining a source coordinate frame. The pulsed magnetic fields are sensed ...


10
Per Krogh Hansen: Optical 6D measurement system with two fan shaped beams rotating around one axis. Ascension Technology Corporation, H Jay Spiegel, April 21, 1998: US05742394 (163 worldwide citation)

A system for the determination of the distance and orientation of an object carrying at least three light sensors from a fixed reference point when the object is irradiated by two modulated scanning beams of known angular orientation and rotational frequency. Timing circuitry located in the control ...