GNSS signal processing methods and apparatus with scaling of quality measure

摘要

A filter estimates a float value for each float ambiguity of a state vector determined from GNSS signals. Integer values are assigned to at least a subgroup of the estimated float values to define integer ambiguity candidate sets. A quality measure is determined for each of the candidate sets. An expectation value of the candidate set having the best quality measure is determined. An error measure as a ratio of the best quality measure to the expectation value is determined. The quality measures of the candidate sets is adapted as a function of the error measure. A weighted average of a subgroup of the candidate sets on the basis of the adapted quality measures is formed. Ambiguities of the weighted average can be used in subsequent operations to aid in determining a position of the receiver.