Patents by Inventor Freerk Dijkstra
Freerk Dijkstra has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8981904Abstract: A method, controller and system in accordance with various aspects of the present disclosure facilitate reduced energy consumption in a motion sensing device having an inertial measurement unit (IMU), with a strap down integration unit, and an application processing unit (AP). The system and method include rounding velocity increments and orientation increments at the inertial measurement unit, thereby producing a remainder values. The remainder values are added to subsequent velocity increments and orientation increments prior to rounding of those values, and so on. In this way, while motion granularity is slightly decreased, there is no drift of integration errors over time.Type: GrantFiled: March 27, 2012Date of Patent: March 17, 2015Assignee: Xsens Holding B.V.Inventors: Hendrik Johannes Luinge, Giovanni Bellusci, Freerk Dijkstra
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Patent number: 8952785Abstract: A method, controller and system in accordance with various aspects of the present disclosure facilitate reduced energy consumption in a motion sensing device having an inertial measurement unit (IMU), with a strap down integration unit, and an application processing unit (AP). The system and method include sensing acceleration values and rotational values at the IMU and converting the sensed acceleration and rotational values into velocity and orientation increments by strap down integration. The velocity and orientation increments are stored in a first buffer at the IMU between updates to the AP. When an update request is received at the IMU from the AP over an interrupt link, the buffer contents are transmitted over a serial link from the IMU to the AP.Type: GrantFiled: March 27, 2012Date of Patent: February 10, 2015Assignee: Xsens Holding B.V.Inventors: Freerk Dijkstra, Hendrik Johannes Luinge, Giovanni Bellusci, Per Johan Slycke
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Patent number: 8947206Abstract: A method of enabling a wireless communication between a master unit and at least one sensor unit is executed within a frame, the sensor unit having an internal data sampling frequency and being adapted to store samples with corresponding sample sequence numbers. The sensor unit transmits an integrated value to the master unit. The master unit transmits, during a master unit portion of the frame, a data update request message comprising an initial sample sequence number from which integration by the at least one sensor unit has to be carried out. The sensor unit integrates the sample values from the initial sample sequence number to a current sample sequence number and then transmits the integrated sample value and the current sample sequence number. The master unit receives the integrated sample value and current sample sequence number and stores at least the current sample sequence number.Type: GrantFiled: November 5, 2010Date of Patent: February 3, 2015Assignee: Xsens Holding B.V.Inventors: Freerk Dijkstra, Per Johan Slycke
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Publication number: 20120223846Abstract: A method, controller and system in accordance with various aspects of the present disclosure facilitate reduced energy consumption in a motion sensing device having an inertial measurement unit (IMU), with a strap down integration unit, and an application processing unit (AP). The system and method include rounding velocity increments and orientation increments at the inertial measurement unit, thereby producing a remainder values. The remainder values are added to subsequent velocity increments and orientation increments prior to rounding of those values, and so on. In this way, while motion granularity is slightly decreased, there is no drift of integration errors over time.Type: ApplicationFiled: March 27, 2012Publication date: September 6, 2012Applicant: XSENS HOLDING B.V.Inventors: Hendrik Johannes Luinge, Giovanni Bellusci, Freerk Dijkstra
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Publication number: 20120226468Abstract: A method, controller and system in accordance with various aspects of the present disclosure facilitate reduced energy consumption in a motion sensing device having an inertial measurement unit (IMU), with a strap down integration unit, and an application processing unit (AP). The system and method include sensing acceleration values and rotational values at the IMU and converting the sensed acceleration and rotational values into velocity and orientation increments by strap down integration. The velocity and orientation increments are stored in a first buffer at the IMU between updates to the AP. When an update request is received at the IMU from the AP over an interrupt link, the buffer contents are transmitted over a serial link from the IMU to the AP.Type: ApplicationFiled: March 27, 2012Publication date: September 6, 2012Applicant: XSENS HOLDING B.V.Inventors: Freerk Dijkstra, Hendrik Johannes Luinge, Giovanni Bellusci, Per Johan Slycke
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Patent number: 8203487Abstract: 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.Type: GrantFiled: August 3, 2009Date of Patent: June 19, 2012Assignee: Xsens Holding, B.V.Inventors: Jeroen D. Hol, Freerk Dijkstra, Hendrik Johannes Luinge, Per Johan Slycke
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Publication number: 20110109438Abstract: A method of enabling a wireless communication between a master unit and at least one sensor unit is executed within a frame, the sensor unit having an internal data sampling frequency and being adapted to store samples with corresponding sample sequence numbers. The sensor unit transmits an integrated value to the master unit. The master unit transmits, during a master unit portion of the frame, a data update request message comprising an initial sample sequence number from which integration by the at least one sensor unit has to be carried out. The sensor unit integrates the sample values from the initial sample sequence number to a current sample sequence number and then transmits the integrated sample value and the current sample sequence number. The master unit receives the integrated sample value and current sample sequence number and stores at least the current sample sequence number.Type: ApplicationFiled: November 5, 2010Publication date: May 12, 2011Applicant: XSENS HOLDING, B.VInventors: Freerk Dijkstra, Per Johan Slycke
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Publication number: 20110046915Abstract: The invention provides robust real-time motion capture, using an inertial motion capture system, aided with a positioning system, of multiple closely interacting actors and to position the actor exactly in space with respect to a pre-defined reference frame. It is a further object of the invention to use such positioning systems to aid the inertial motion capture system that the known advantages of using inertial motion capture technology is not compromised to a great extent. Such positioning systems include pressure sensors, UWB positioning systems and GPS or other GNSS systems. It is a further object of the invention to avoid the use of the earth magnetic field as a reference direction as much as possible, due to the known problems of distortion thereof.Type: ApplicationFiled: August 4, 2010Publication date: February 24, 2011Applicant: XSENS HOLDING B.V.Inventors: Jeroen D. Hol, Freerk Dijkstra, Hendrik Johannes Luinge, Daniel Roetenberg, Per Johan Slycke
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Publication number: 20110025562Abstract: 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.Type: ApplicationFiled: August 3, 2009Publication date: February 3, 2011Applicant: Xsens Technologies, B.V.Inventors: Jeroen D. Hol, Freerk Dijkstra, Hendrik Johannes Luinge, Per Johan Slycke