Research On GNSS Algorithm And Its Application In Deformation Monitoring

In this thesis, GNSS algorithms research and its application in deformation monitoring are investigated and researched,and software of deformation monitoring datas management and analysis of GNSS are development in the Visual C#language.The practical engineering deformation monitoring data are implemented to manage and analyse using the software.Firstly, the composition, development and research actuality of GNSS are briefly reviewed. The necessary of GNSS algorithm research and its application in deformation monitoring are analysed.Secondly, the fundamental positioning theories based on GNSS are discussed,including the satellite signal structure and their observed quantity.The calculation of satellites’position are researched, aimed at two different navigation message parameters, the method of each satellite coordinates calculation are given.Moreover,the data processing methodologies including the cycle-slip detection and repair,the carrier ambiguity resolution,and practical datas calculation and analysis though two algorithms.The three positioning differenced strategy of GNSS is derived from the positioning differenced strategy of GPS system.Thirdly, According to the analysis of GNSS deformation monitoring data, equation of Kalman Filtering,confirmation of initial state and model establishment are researched,and the GNSS adjustment datas are analysed using this model.The ability of reflection deformation monitoring’s actual change situation is validated though the analysis and prediction results from Kalman Filtering.Finally, GNSS application in deformation monitoring is reviewed, two monitoring methods and monitoring data processing of GNSS are introduced using Yanshuigou tunnel deformation monitoring engineering,special analyse the three day around of6.6earthquake. Data management based on SQL Server2008and the graph of displacement based on Zedgraph are researched, and integrated into software of data management and deformation analysis. Ten times of Yanshuigou tunnel’s GNSS deformation monitoring data form november2011to march2013are implemented to demonstrate the feasibility of the software.At last,the concluding remarks and future work are briefly presented.