Data Processing Of GPS Precise Point Positioning

Precise Point Positioning of GPS is a hot topic of GPS research field presenctely, which use precise ephemeris and precise satellite clock information. This method use undifferenced dual-frequency pseudorange and carrier phase observation for stand-alone precise geodetic point positioning, and it could obtain precise International Terrestrial Referance Frame (ITRF) coordinate directly. It is useful in many fieleds because it could do kinematic or static point positioning in the global fiele use stand-alone receiver.This paper researched the principle of GPS Precise Point Positioning,undifferenced observation modal, main errors resource and there eliminate modal, pretreatment ofUndifferenced data are analysised.Finally a funciton made by MATLAB is used for verification and analysis for PPP related problems from a huge observation data.the main works are as follow:1 The thesis does researches on three kinds of undifferenced positioning modal,such as the traditional modal,the UofC modal and the nonambiguity modal. main errors resource and there eliminate or weaken modal are analysised.2 Analysised the data pretreatment of undifferenced GPS Precise Point Positioning,which include cycle slips detecting and removing,ambiguity fixing and so on,it's the safeguard of PPP.3 The thesis adopts chebyshev polynomial to work out satellite coordinates and clock error, the least square and kalman filtering sre studied, the kalman filtering is more suitable for processing dynamical GPS data .4 The PPP process module is developed use MATLAB, and anaylsis the result with huge data.