MOTION TRACKING SYSTEM
First Claim
1. A motion tracking system for tracking an object composed of object parts in a three-dimensional space, comprising:
- one or more transmitter modules provided in fixed positional relationship with respect to at least one object part, for transmitting magnetic fields, with mutually different main directions;
a magnetic measuring module for receiving the magnetic fields, wherein the magnetic measuring module has a fixed positional relationship with an object part of the composite object;
an inertial measurement unit for recording a linear acceleration and an angular velocity or angular acceleration, wherein the inertial measurement unit has a fixed positional relationship with an object part of the composite object;
a processor for controlling the one or more transmitter modules and receiving signals coming from the magnetic measuring module and the inertial measurement unit;
which processor contains a module for deriving orientation and/or position information of the constituent object parts of the object on the basis of the received signals, characterized in thatthe processor is configured to make the one or more transmitter modules transmit an intermittent magnetic field, wherein the position and/or orientation information in a period between the intermittent transmitting is derived by means of the motion information coming from the inertial measurement unit, which is periodically calibrated with the motion information coming from the magnetic measuring module.
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Accused Products
Abstract
A motion tracking system for tracking an object composed of object parts in a three-dimensional space. The system comprises a number of magnetic field transmitters; a number of field receivers for receiving the magnetic fields of the field transmitters; a number of inertial measurement units for recording a linear acceleration; a number of angular velocity transducers for recording angular velocities. The system further comprises a processor for controlling the transmitters and receiving signals coming from the field receivers and the inertial measurement unit; which processor contains a module for deriving orientation and/or position information of the constituent object parts of the object on the basis of the received signals. The processor is configured for intermittently controlling the transmitters transmit at a predetermined frequency, wherein the position and/or orientation information is derived by periodically calibrating the motion information coming from the inertial measurement unit with the motion information coming from the magnetic field receivers.
74 Citations
16 Claims
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1. A motion tracking system for tracking an object composed of object parts in a three-dimensional space, comprising:
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one or more transmitter modules provided in fixed positional relationship with respect to at least one object part, for transmitting magnetic fields, with mutually different main directions; a magnetic measuring module for receiving the magnetic fields, wherein the magnetic measuring module has a fixed positional relationship with an object part of the composite object; an inertial measurement unit for recording a linear acceleration and an angular velocity or angular acceleration, wherein the inertial measurement unit has a fixed positional relationship with an object part of the composite object; a processor for controlling the one or more transmitter modules and receiving signals coming from the magnetic measuring module and the inertial measurement unit;
which processor contains a module for deriving orientation and/or position information of the constituent object parts of the object on the basis of the received signals, characterized in thatthe processor is configured to make the one or more transmitter modules transmit an intermittent magnetic field, wherein the position and/or orientation information in a period between the intermittent transmitting is derived by means of the motion information coming from the inertial measurement unit, which is periodically calibrated with the motion information coming from the magnetic measuring module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification