Patents by Inventor Stephen R. Chestnut

Stephen R. Chestnut 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).

  • Method and computer-readable storage medium with instructions for processing data in an internal navigation system
    Patent number: 8224575
    Abstract: A method for processing data in an inertial navigation system having a Kalman filter and computer-readable storage medium containing instructions to configure a processor to perform the same. The method produces more accurate estimates of the position, velocity and attitude of the inertial measurement unit. The method is fully automatic and enables zero-velocity updates and fixed-azimuth updates to be performed simultaneously. The method may also include a multi-stage filtering process to filter digital compass data when used in an environment with extraterrestrial magnetic field sources. The method may also include a fixed-lag smoother to improve estimates of the position, velocity and attitude of the inertial measurement unit. The method also may include processes to constrain altitude errors.
    Type: Grant
    Filed: April 8, 2008
    Date of Patent: July 17, 2012
    Assignee: ENSCO, Inc.
    Inventors: W. Todd Faulkner, Stephen R. Chestnut, David W. A. Taylor
  • Method and computer-readable storage medium with instructions for processing data in an internal navigation system
    Publication number: 20090254276
    Abstract: A method for processing data in an inertial navigation system having a Kalman filter and computer-readable storage medium containing instructions to configure a processor to perform the same. The method produces more accurate estimates of the position, velocity and attitude of the inertial measurement unit. The method is fully automatic and enables zero-velocity updates and fixed-azimuth updates to be performed simultaneously. The method may also include a multi-stage filtering process to filter digital compass data when used in an environment with extraterrestrial magnetic field sources. The method may also include a fixed-lag smoother to improve estimates of the position, velocity and attitude of the inertial measurement unit. The method also may include processes to constrain altitude errors.
    Type: Application
    Filed: April 8, 2008
    Publication date: October 8, 2009
    Inventors: W. Todd Faulkner, Stephen R. Chestnut, David W.A. Taylor