Several Kinds Of Troposphere Delay Correction Model Impact On GPS Precise Point Positioning

GPS Precise Point Positioning is currently a hot issue in the field of GPS applications,the impact of precise point positioning accuracy and convergence rate is the key to the errorionosphere, troposphere, etc. are handled. For the treatment of these errors, especiallytropospheric delay processing error in the current existing algorithms, the model correctionmethod and parameter estimation method is more commonly used in two ways. Correctproblems that affect their precise point positioning errors in tropospheric delay, the results ofresearch work carried out in this paper and obtained as follows:(1) Describes the GPS Precise Point Positioning theory and mathematical models used toanalyze the advantages and disadvantages of the different positioning of the model.(2) Describes the precise point positioning of the various error sources, given theappropriate treatment, and focuses on the classical model and the mapping function of severaltropospheric process.(3) Describes the basic principles of tropospheric delay, its model correction method,parameter estimation and external correction method to do a detailed analysis and comparisonof the different tropospheric delays delay correction model with elevation changes.(4) The resulting tropospheric error correction model, adding to Gpstools the precisepoint positioning module coordinates the solver and solver results with the use ofhigh-precision GPS positioning data processing software results obtained were compared andanalyzed, on the results, the positioning accuracy using EGNOS model and Saastamoinenmodel are quite superior positioning results Hopfield model and Black models.