A Study Of Algorithms For Real-time Precise Point Positioning And Quality Control With The Beidou Navigation Satellite System

Precise point positioning(PPP)is a new satellite positioning technology proposed in the late nineties of the last century,which combines the advantages of single point positioning and relative positioning.Therefore it is focused by many scholars and research institutions and becomes one of current research frontier and hotspots for satellite navigation and positioning.In the last few decades,PPP theory has made great development,and is moving toward practical application stage.Compared with traditional PPP,The real-time PPP technology can provide users with correction of real-time clock error,orbit and ionosphere,It can achieve positioning accuracy from decimeter to centimeter by the use of PPP positioning model and algorithm.This thesis mainly discusses the real-time precise point positioning mathematical model,error correction and quality control,and the use of C-band satellite broadcasting system to provide practical basis for real-time PPP technology.The main work of this thesis is as follows:(1)Error correction is a guarantee of achieving precise point positioning.It is directly related to the reliability of the positioning results.Different error correction methods are studied in this thesis.The variation characteristics of the error source of Beidou precise point positioning in the spatial domain and time domain are analyzed,And the effect of different errors on the positioning results is analyzed in detail.(2)This thesis introduces the commonly used positioning model and stochastic model.Analyzing the similarities and differences of the current common PPP positioning model.We introduce commonly used stochastic models and compare the two commonly used stochastic models.(3)In order to achieve high-precision positioning and to ensure that PPP can successfully converge.it is necessary to carry out quality control on data source,function model,random model and so on.The main focus of this thesis is on quality control based on robust estimation.The use of robust estimation reduces the effect of data source error on the positioning accuracy,thus improving the positioning accuracy.(4)The Beidou real-time PPP is realized by program design and the program achieve positioning solution in a specific scene.The Beidou real-time PPP experiment is carried out base on the C-band satellite broadcast system.The real-time corrections of orbit?clock errors and ionosphere are broadcast by the system for position experiments,and analysis the experiments results.