Centimeter accurate global positioning system receiver for on-the-fly real-time kinematic measurement and control
February 18, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethod and equipment for automatic guidance of earthmoving machines and especially machines for laying drainage elements Method of automatically steering agricultural type vehicles Grading system Method and apparatus for precision attitude determination and kinematic positioning Method of simultaneously measuring orthometric and geometric heights Method of determining mining progress in open cast mining by means of satellite geodesy Differential position determination using satellites Millimetric wave radar system for the guidance of mobile ground robot Method and apparatus for maximum likelihood estimation direct integer search in differential carrier phase attitude determination systems Automatic antenna pointing system based on global positioning system (GPS) attitude information InventorsAssigneeApplicationNo. 199387 filed on 02/18/1994US Classes:701/214, Means to improve accuracy of position or location342/357.03, Using differential correction342/357.06, Using Global Positioning Satellite (GPS or Glonass)342/357.17, With particular action taken responsive to position342/457, Land vehicle location (e.g., bus, police car348/148, Vehicular701/1VEHICLE CONTROL, GUIDANCE, OPERATION, OR INDICATIONExaminersPrimary: Zanelli, Michael J.Attorney, Agent or FirmInternational ClassesG01S 003/02G01S 005/02 G06F 165/00 AbstractA system embodiment of the present invention comprises a fixed and a roving pair of four-observable GPS receivers and a communication link between them for double differencing code and carrier measurements. Carrier phase integer ambiguities are resolved efficiently by searching the simultaneous narrow-lane intersections of both the L1 and L2 wave fronts propagated by the GPS satellites being tracked. External constraint information, such as elevation, is additionally used to speed up integer ambiguity resolution. Data between the reference station and the rover is communicated in compressed form at a regular interval, e.g., once a second at each epoch, and demi-measurements of carrier phase are obtained more frequently, e.g., ten times a second, and used to propagate solutions between epochs. | |
