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Fixing ambiguities is beneficial to improve accuracy and convergence time of precise point positioning (PPP). In recent years, several methods have been proposed to estimate fractional cycle biases (FCBs) to realize ambiguity-fixed PPP. Existing single-difference models are mostly for GPS-only ambiguity-fixed PPP. However, the use of a single-difference model to achieve fixed ambiguities in GPS + GLONASS...
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