Larry B Levy

US Patent:

20030055562, Mar 20, 2003

Filed:

Jul 3, 2002

Appl. No.:

10/169514

Inventors:

Larry Levy - Columbia MD, US
Thomas Thompson - Silver Springs MD, US
David Hohman - Woodbine MD, US
Thomas Murdock - Eldersburg MD, US
Edwin Westerfield - Silver Spring MD, US
Thomas Hattox - Silver Springs MD, US
Thomas Kusterer - Elkridge MD, US

International Classification:

G01C021/36

US Classification:

701/214000, 701/213000

Abstract:

A real-time integrated navigation system for a vehicle includes a GPS receiver, connected to a first antenna, where the GPS receiver receives GPS data from satellites and outputs GPS position data. The system also includes a communications link, connected to a second antenna and to the GPS receiver, receiving range and carrier phase measurements from at least one base station. The system further includes navigation aids which provide relative position data of said vehicle and a Kalman filter, connected to the output of the GPS receiver and the navigation aids, that integrates the GPS position data and the relative position data and outputs smoothed position data. The smoothed position data is used in transportation applications, especially detection of lane departure. This GPS-based positioning system is suitable for highway speeds during all weather conditions.