Method for using external constraints to improve the speed and reliability of phase ambiguity resolution in real-time kinematic initialization
January 7, 2017. 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 of determining mining progress in open cast mining by means of satellite geodesy Differential position determination using satellites Determination of phase ambiguities in satellite ranges Kinematic global positioning system of an on-the-fly apparatus for centimeter-level positioning for static or moving applications Patent #: 5442363 InventorsAssigneeApplicationNo. 779475 filed on 01/07/1997US Classes:701/214, Means to improve accuracy of position or location342/457Land vehicle location (e.g., bus, police carExaminersPrimary: Zanelli, Michael J.Attorney, Agent or FirmInternational ClassesG01S 003/02G01S 005/02 G06F 165/00 AbstractA method for obtaining integer ambiguity solutions based on externally provided constraints, e.g., altitude. Such constraints are useful in reducing the computational burden created by the search problem, and using constraints is particularly more effective when a more limited number of satellite vehicles are visible than is ordinarily the case. The constraints are exercised in a search algorithm. As the branches of the integer ambiguity search tree are traversed, an additional test is used to determine if the current search candidate is compatible with such external constraint. Because a three-dimensional position is associated with each search candidate, the branch clipping is straightforward. The ambiguity candidates are each only acceptable if their locations in space are within a confidence region bound set determined from the external constraint. Any sensor that can provide any combination of x, y, or z position information that is better than that obtainable from GPS code phase is a candidate source of such external constraints.Other References
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