Patents by Inventor John R. Dowdle

John R. Dowdle 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).

  • Patent number: 6731237
    Abstract: A system and method for generating a multidimensional navigation solution utilizes Global Positioning System (GPS) data to obtain highly reliable and accurate navigational solutions in high interference and dynamic environments, at a performance level which has been heretofore unattainable. Additional sensors such as inertial (gyros and accelerometers), altimeters, radars, etc. may be employed in a deeply integrated configuration. The approach taken in the present invention differs from that of previous techniques through its exploitation of nonlinear filtering methods; as a result, the navigation system architecture and processes employed yield significant improvements in navigation system performance, both in code tracking and reacquisition, and in carrier tracking and reacquisition. The improvements are particularly significant at low signal/noise ratios, where conventional approaches are especially susceptible to loss of code lock or carrier lock.
    Type: Grant
    Filed: December 3, 2001
    Date of Patent: May 4, 2004
    Assignee: The Charles Stark Draper Laboratory, Inc.
    Inventors: Donald E. Gustafson, John R. Dowdle, John M. Elwell, Jr.
  • Patent number: 6693592
    Abstract: A wireless navigational system and process utilize multipath wireless signals normally discarded from the navigation solution to enhance navigational performance under a range of operational scenarios. A relationship between the receiver's location and one or more multipath signals is established, facilitating subsequent navigation using the multipath signal(s).
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: February 17, 2004
    Assignee: The Charles Stark Draper Laboratory, Inc.
    Inventors: John R. Dowdle, Donald E. Gustafson, John M. Elwell, Jr.
  • Patent number: 6630904
    Abstract: A system and method for generating a multidimensional navigation solution utilizes Global Positioning System (GPS) data to obtain highly reliable and accurate navigational solutions in high interference and dynamic environments, at a performance level which has been heretofore unattainable. Additional sensors such as inertial (gyros and accelerometers), altimeters, radars, etc. may be employed in a deeply integrated configuration. The approach taken in the present invention differs from that of previous techniques through its exploitation of nonlinear filtering methods; as a result, the navigation system architecture and processes employed yield significant improvements in navigation system performance, both in code tracking and reacquisition, and in carrier tracking and reacquisition. The improvements are particularly significant at low signal/noise ratios, where conventional approaches are especially susceptible to loss of code.
    Type: Grant
    Filed: October 10, 2001
    Date of Patent: October 7, 2003
    Assignee: The Charles Stark Draper Laboratory, Inc.
    Inventors: Donald E. Gustafson, John R. Dowdle, John M. Elwell, Jr.
  • Publication number: 20020126044
    Abstract: A system and method for generating a multidimensional navigation solution utilizes Global Positioning System (GPS) data to obtain highly reliable and accurate navigational solutions in high interference and dynamic environments, at a performance level which has been heretofore unattainable. Additional sensors such as inertial (gyros and accelerometers), altimeters, radars, etc. may be employed in a deeply integrated configuration. The approach taken in the present invention differs from that of previous techniques through its exploitation of nonlinear filtering methods; as a result, the navigation system architecture and processes employed yield significant improvements in navigation system performance, both in code tracking and reacquisition, and in carrier tracking and reacquisition. The improvements are particularly significant at low signal/noise ratios, where conventional approaches are especially susceptible to loss of code lock or carrier lock.
    Type: Application
    Filed: December 3, 2001
    Publication date: September 12, 2002
    Inventors: Donald E. Gustafson, John R. Dowdle, John M. Elwell
  • Publication number: 20020089450
    Abstract: A wireless navigational system and process utilize multipath wireless signals normally discarded from the navigation solution to enhance navigational performance under a range of operational scenarios. A relationship between the receiver's location and one or more multipath signals is established, facilitating subsequent navigation using the multipath signal(s).
    Type: Application
    Filed: December 21, 2001
    Publication date: July 11, 2002
    Inventors: John R. Dowdle, Donald E. Gustafson, John M. Elwell
  • Publication number: 20020047799
    Abstract: A system and method for generating a multidimensional navigation solution utilizes Global Positioning System (GPS) data to obtain highly reliable and accurate navigational solutions in high interference and dynamic environments, at a performance level which has been heretofore unattainable. Additional sensors such as inertial (gyros and accelerometers), altimeters, radars, etc. may be employed in a deeply integrated configuration. The approach taken in the present invention differs from that of previous techniques through its exploitation of nonlinear filtering methods; as a result, the navigation system architecture and processes employed yield significant improvements in navigation system performance, both in code tracking and reacquisition, and in carrier tracking and reacquisition.
    Type: Application
    Filed: October 10, 2001
    Publication date: April 25, 2002
    Inventors: Donald E. Gustafson, John R. Dowdle, John M. Elwell
  • Patent number: 6331835
    Abstract: A system and method for generating a multidimensional navigation solution utilizes Global Positioning System (GPS) data to obtain highly reliable and accurate navigational solutions in high interference and dynamic environments, at a performance level which has been heretofore unattainable. Additional sensors such as inertial (gyros and accelerometers), altimeters, radars, etc. may be employed in a deeply integrated configuration. The approach taken in the present invention differs from that of previous techniques through its exploitation of nonlinear filtering methods; as a result, the navigation system architecture and processes employed yield significant improvements in navigation system performance, both in code tracking and reacquisition, and in carrier tracking and reacquisition. The improvements are particularly significant at low signal/noise ratios, where conventional approaches are especially susceptible to loss of code lock or carrier lock.
    Type: Grant
    Filed: November 9, 1999
    Date of Patent: December 18, 2001
    Assignee: The Charles Stark Draper Laboratory, Inc.
    Inventors: Donald E. Gustafson, John R. Dowdle, John M. Elwell, Jr.