Patents by Inventor Jonathan A. Tekawy

Jonathan A. Tekawy 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).

  • SPACE-BASED LEVER ARM CORRECTION IN NAVIGATIONAL SYSTEMS EMPLOYING SPOT BEAMS
    Publication number: 20070080859
    Abstract: A method and apparatus for estimating a lever arm correction between the wide beam antenna and the spot beam antenna in a navigational satellite system is disclosed. A prescribed satellite maneuver is used to increase the accuracy of the predicted satellite attitude in determining the lever arm, and lever arm corrections are provided to navigation receivers using curve fit coefficients to permit long range estimates and to minimize data transmission requirements.
    Type: Application
    Filed: October 10, 2005
    Publication date: April 12, 2007
    Inventors: Jonathan Tekawy, Kevin O'Brien
  • Spot beam antenna boresight calibration using GPS receivers
    Publication number: 20070046537
    Abstract: A method and apparatus for calibrating such a spot beam antenna by use of scanned spot beam signal characteristics measured by a plurality of ground based navigation receivers is disclosed.
    Type: Application
    Filed: August 29, 2005
    Publication date: March 1, 2007
    Inventors: Jonathan Tekawy, Kevin O'Brien
  • User segment-based lever arm correction via prescribed maneuver for high-accuracy navigation
    Patent number: 7129889
    Abstract: A method and apparatus for computing a lever arm correction between a wide beam coverage antenna and a steerable spot beam antenna of a navigational satellite is disclosed. A navigation receiver computes the lever arm correction using information from the navigational satellite that allows both the position of the navigational satellite and the navigational receiver to be determined using a known geometry of the steerable spot beam antenna and a prescribed satellite attitude maneuver profile.
    Type: Grant
    Filed: October 10, 2005
    Date of Patent: October 31, 2006
    Assignee: The Boeing Company
    Inventors: Kevin M. O'Brien, Jonathan A. Tekawy