Extended GNSS ambiguity resolution models with regularization cri- terion and constraints

This paper firstly presents an extended ambiguity resolution model that deals with an ill-posed problem and constraints between the estimated parameters. In the extended model, the regularization criterion is used instead of the traditional least squares in order to estimate the float ambiguities better. The existing models can be derived from the general model. Secondly, the paper examines the existing ambiguity searching methods from four aspects: exclusion of nuisance integer candidates based on the available integer constraints; integer rounding; integer bootstrapping and integer least squares estimations. Finally, an experiment is carried out to demonstrate the ambiguity resolution performance under the regularization criterion with different constraints.