Research on GPS Precise Point Positioning and Adjustment of High Precision GPS Baseline Network and the Realization of Its Software

Abstract: With the development of space technology, the technique of GPS positioning has wide applications, there increasingly requires high-precision of this type of positioning. Hence, it will have certain theoretical and practical value to study the precise point positioning and the methodology of data processing in the adjustment of GPS high-precision network.In general, this thesis can be divided into two parts. The first consists of the study of precise single-point positioning model and satellite clock error as well as the realization of P3EXT software. This part is mainly about research on the accuracy of precise ephemeris clock error through spectral analysis, the mathematical model of precise single-point positioning, the comparison of three adaptive filtering in ppp, the compilation of the corresponding software and so on. The second includes study of methodology of data processing in the adjustment of GPS high-precision network. In this section, the author compiles the corresponding software by adopting the condition adjustment with datum and system parameters.The work done can be summarized as follows:The observational model and its linear combination of GPS single-point positioning are discussed in the paper. The author also analyses various error sources as well as the corresponding modification model and generalizes key techniques in precise single-point positioning.Applying spectral analysis to analyze the accuracy of the products of IGS precise ephemeris clock error, the author concludes that the precision of satellite clock error is uneven.The mathematical model of precise single-point positioning, including function model and stochastic model, is also discussed in the thesis. As Kalman Filtering is apt to scatter, three kinds of models of adaptive filtering are balanced and applied to precise single-point positioning.In GPS kinematic positioning, if adopting sequential adjustment, when the ambiguity parameters are changing and the reference satellite is moving, the relations between adjacent epoch will become abnormally complex, resulting in the complexity of adjustment model. To address this issue, the author obtains a unified model of sequential adjustment and justifies its rightness and high efficiency by applying to practical examples.This thesis is focused on the study of adjustment model of GPS high-precision deformation monitoring network, including function model, stochastic model as well as adjustment datum model with system parameters and so on. The impact formula of system parameters on coordinate estimation is obtained. When processing data of deformation monitoring network, the author suggests considering the impact of system parameters and selecting appropriate datum model.It has been finished the compilation of software of precise single-point positioning and adjustment of GPS high-precision network. Basic idea and procedural framework of the software are also shown in the thesis…
Key words: PPP; satellite clock error; kalman filtering; Sequential Adjustment; GPS-Net adjustment; reference model; systemic parameters; spot baseline

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