Patents Assigned to Crossbow Technology
  • Dynamic attitude measurement method and apparatus
    Patent number: 6853947
    Abstract: A method and system senses the attitude of an accelerating object by measuring acceleration with accelerometers in three orthogonal axes and measuring angular rate with angular rate sensors disposed about each such axis to compute attitude of the object accurately relative to a vertical axis. A processor updates a quaternion representation of attitude based upon the angular rate of the object, and a corrective rate signal is determined from level frame acceleration as a reference for a Kalman filter in calculating the attitude of the object.
    Type: Grant
    Filed: October 13, 2003
    Date of Patent: February 8, 2005
    Assignee: Crossbow Technology
    Inventor: Michael A. Horton
  • Dynamic attitude measurement method and apparatus
    Patent number: 6647352
    Abstract: A method and system attitude of an accelerating object by measuring acceleration with accelerometers in three orthogonal axes and measuring angular rate with angular rate sensors disposed about each such axis to compute attitude of the object accurately relative to a vertical axis. A processor updates a quaternion representation of attitude based upon the angular rate of the object, and a corrective rate signal is determined from level frame acceleration as a reference for a Kalman filter in calculating the attitude of the object.
    Type: Grant
    Filed: May 1, 2002
    Date of Patent: November 11, 2003
    Assignee: Crossbow Technology
    Inventor: Michael A. Horton