Patents by Inventor Peter Griffioen

Peter Griffioen 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).

  • Real-time kinematic initialization test system
    Patent number: 5748145
    Abstract: A real-time kinematic system includes base and rover GPS units connected by a data link. The rover unit is typically moved to points of interest during a survey while the base remains over a fixed, and known location. An initialization testing program of the present invention is mounted on a personal computer platform that forces in the rover a loss of signal tracking, thus simulating losses in signal reception caused by obstructions of the satellite signals. A complete initialization is forced to occur. The test program uninitializes the RTK solution by causing a loss of integer ambiguities resolution by forcing a loss of lock on one or more satellites. The test program then monitors the subsequent initialization process, e.g.
    Type: Grant
    Filed: December 4, 1996
    Date of Patent: May 5, 1998
    Assignee: Trimble Navigation Limited
    Inventors: Nicholas C. Talbot, Michael T. Allison, Peter Griffioen
  • Real-time kinematic initialization test system
    Patent number: 5610614
    Abstract: A real-time kinematic system includes base and rover GPS units connected by a data link. The rover unit is typically moved to points of interest during a survey while the base remains over a fixed, and known location. An initialization testing program of the present invention is mounted on a personal computer platform that forces in the rover a loss of signal tracking, thus simulating losses in signal reception caused by obstructions of the satellite signals. A complete initialization is forced to occur. The test program uninitializes the RTK solution by causing a loss of integer ambiguities resolution by forcing a loss of lock on one or more satellites. The test program then monitors the subsequent initialization process, e.g.
    Type: Grant
    Filed: September 13, 1995
    Date of Patent: March 11, 1997
    Assignee: Trimble Navigation Limited
    Inventors: Nicholas C. Talbot, Michael T. Allison, Peter Griffioen