Xsens Technologies, B.V. Patent applications |
Patent application number | Title | Published |
20110234452 | POSITIONING SYSTEM CALIBRATION - The described principles provide a method and system for calibrating an UWB RF positioning system. Means for automated calibration of the UWB RF positioning system allow calibration based on simple user input that does not require accuracy. Thus, the disclosed calibration means enables nomadic deployment of UWB RF positioning systems by enabling fast and easy calibration and re-calibration of the system based on in-use data to correct for changes in the system during use. Furthermore, in an embodiment of the invention, means are provided for direct feedback of calibration accuracy to the user. In a further embodiment of the invention, the full use of a UWB positioning system is enabled by obtaining optimal accuracy even at the outskirts of the tracking volume and by providing optimal accuracy for a given number of receivers. | 09-29-2011 |
20110028865 | Inertial Sensor Kinematic Coupling - A method is disclosed for measuring the motion of an object, composed of multiple segments connected by joints, via the estimation of the 3D orientation of the object segments relative to one another without dependence on a magnetic field as a reference for heading. The method includes first applying a plurality of inertial sensor units to the segments of the object, e.g., a user thigh, shank, foot, etc. Next an approximation of the distance between each inertial sensor unit and at least one adjacent joint is provided and the joint is subjected to an acceleration, e.g., as the user takes a step or two. The relative orientations of the segments are calculated and the orientations are used to form an estimation of the 3D orientation of the object segments relative to one another without using the local magnetic field as a reference for heading. | 02-03-2011 |
20110025562 | Tightly Coupled UWB/IMU Pose Estimation System and Method - A six-degree-of-freedom (6DOF) tracking system adapts aspects of Ultra-Wideband (UWB) measurement and microelectromechanical systems (MEMS) inertial measurements within a unique tightly coupled fusion algorithm to accurately and efficiently measure an object's position as well as orientation. The principle of operation of the system protects against the negative effects of multipath phenomenon and non-line-of-sight (NLOS) conditions, allowing a more robust position and orientation tracking system. | 02-03-2011 |
20090278791 | MOTION TRACKING SYSTEM - 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. | 11-12-2009 |
20090056445 | DEVICE AND METHOD FOR MEASURING THE DYNAMIC INTERACTION BETWEEN BODIES - The invention relates to a device for measuring the dynamic interaction, in particular power transfer and work performed, between a first and a second body, in particular during relatively random movements. The device comprises a housing in which at least one kinematic sensor and at least one kinetic sensor is arranged, in addition to processing means for processing the signals from the sensors, and communication means for data exchange with the outside world. The invention also relates to a method for measuring the dynamic interaction between a first and a second body, and a carrier provided with a number of devices according to the invention. | 03-05-2009 |
20080285805 | Motion Tracking System - A system is provided for capturing motion of a moving object via a plurality of motion sensor modules placed on various body segments. The sensor modules capture both 3D position and 3D orientation data relating to their respective body segments, thereby gathering motion data having six degrees of freedom with respect to a coordinate system not fixed to the body. Each body sensor collects 3D inertial sensor data and, optionally, magnetic field data. In embodiments, either DSP circuitry within the sensor modules or an external computing device, processes the sensor data to arrive at orientation and position estimates by using an estimation algorithm, such as a Kalman filter or a particle filter. The processing includes biomechanical model constraints that allow flexibility in the joints and provide characteristics for various joint types. To improve estimation accuracy, the system may be integrated with various types of aiding sensors. | 11-20-2008 |
20080262772 | Sytem and a Method for Motion Tracking Using a Calibration Unit - The invention relates to motion tracking system ( | 10-23-2008 |