Patents Assigned to Trimble Navigation Limted
  • Patent number: 6823279
    Abstract: A method for simultaneously determining respective scale factors and alignment angles of a multi-axis accelerometer device for measuring acceleration. To measure the scale factors, the multi-axis accelerometer device to be calibrated is mounted on a turntable. The turntable has a tilt angle with respect to a vertical axis defined by the local gravity vector. The turntable is used to spin the multi-axis accelerometer device around an axis of rotation at an angular velocity such that the multiple sensitive axes of the accelerometer device experience a time varying component of the local gravity vector. The respective outputs of the multiple sensitive axes of the accelerometer device are recorded as the device experiences the time varying component of the local gravity vector. The multi-axis accelerometer device is mounted on the turntable in two more orthogonal orientations, and the rotation and data recording procedure is repeated. The angular velocity can be constant during the logging.
    Type: Grant
    Filed: July 27, 2001
    Date of Patent: November 23, 2004
    Assignee: Trimble Navigation Limted
    Inventors: Vivek B. Nadkarni, Philip Winslow
  • Patent number: D578028
    Type: Grant
    Filed: November 5, 2007
    Date of Patent: October 7, 2008
    Assignee: Trimble Navigation Limted
    Inventor: Jason Goulden