Patent ID: 8368591

Claim:
Method to estimate parameters derived from global navigational satellite system (GNSS) signals useful to determine a position, comprising obtaining observations of a GNSS signal from each of a plurality of GNSS satellites; feeding the observations to a filter having a state vector comprising a float ambiguity for each received frequency of the GNSS signals, each float ambiguity constituting a real number estimate of an integer number of wavelengths of the GNSS signal between a receiver of the GNSS signal and the GNSS satellite from which it is received, the filter estimating a float value for each float ambiguity of the state vector and covariance values associated with the state vector; assigning integer values to at least a subgroup of the estimated float values to define a plurality of integer ambiguity candidate sets; obtaining a weighted average of the candidate sets; determining a formal precision value based on covariance values of the filter, the formal precision value being a measure for an achievable precision; determining an achieved precision value of the weighted average; comparing the achieved precision value with the formal precision value to obtain a convergence value; and indicating a convergence of the determination of the state vector.