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AssigneeNavcom Technology, Inc.
InventorsRichard T. Sharpe, Frederick W. Nelson, Terence D. Pickett, Ronald R. Hatch, Yunchun Yang
Estimating the term…
The present invention includes a method for a combined use of a local RTK system and a regional, wide-area, or global differential carrier-phase positioning system (WADGPS) in which disadvantages associated with the RTK and the WADGPS navigation techniques when used separately are avoided. The method includes using a known position of a user receiver that has been stationary or using an RTK system to initialize the floating ambiguity values in the WADGPS system when the user receiver is moving. Thereafter, the refraction-corrected carrier-phase measurements obtained at the user GPS receiver are adjusted by including the corresponding initial floating ambiguity values and the floating ambiguity values are treated as well known (small variance) in subsequent processes to position the user receiver in the WADGPS system.
A method for determining a floating ambiguity value corresponding to a carrier-phase measurement obtained by a user of a satellite positioning system based on signals received from one of a plurality of satellites, the method comprising:
A method for positioning or navigating an object associated with both a local reference receiver and a wide-area differential satellite positioning system, comprising:
A computer readable medium storing therein computer readable program instructions that, when executed by a processor, cause the process to perform a method for positioning or navigating an object associated with both a local reference receiver and a wide-area differential satellite positioning system, the program instructions comprising:
A satellite navigation receiver configured to operate in two or more modes of operation, wherein in a first mode of operation the satellite navigation receiver determines a first floating ambiguity value in accordance with information received from a local reference receiver, the first floating ambiguity value being used to convert a carrier-phase measurement into a range measurement with an accuracy of at least a first pre-determined value, and wherein in a second mode of operation the satellite navigation receiver determines a second floating ambiguity value in accordance with information received from a wide-area differential satellite-positioning system, the second floating ambiguity value being used to convert the carrier-phase measurement into the range measurement with the accuracy of at least the first pre-determined value.
Dependencies are inferred from the claim text.