Real-time high-accuracy determination of integer ambiguities in a kinematic GPS receiver
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United States of America Patent
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Oct 20, 1998
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app pub date -
Jul 9, 1996
filing date -
Jul 9, 1996
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Abstract
A GPS system and method for real-time determination of integer ambiguities in a global positioning system (GPS) receiver and, more specifically, to a GPS system and method for determining integer ambiguities of a GPS solution using a Kalman filter with double difference integer ambiguities as additional states to estimate the ambiguities until they are estimated to within a sufficiently tight variance around their error estimates. Thereafter, all the candidate integer ambiguity values are searched in the range domain, e.g., along the double difference lines-of-sight for each satellite, until one is selected; if the after-the-fit residuals for the selected integers are below a certain threshold, then the selected integers are accepted as the integer ambiguities. If not, another set of candidate integer values are selected and analyzed.
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