| The diversified development of Global Navigation Satellite System technology makes GNSS System involved in various industries,especially in Navigation and positioning.When GNSS signals pass through the atmosphere,there will be a delay in receiving signals,so the accurate positioning cannot be carried out,resulting in the corresponding error.At the same time of error analysis,the delay in the atmosphere is the focus of people's research,which is very important for the accuracy of positioning,which also determines whether the accuracy can be further improved in the navigation and positioning.In this paper,the calculation method of tropospheric delay error is described.The global positioning system will be affected by a lot of errors in the process of positioning.At the same time,the principle and operation of CORS(continuously operating reference stations)system,which develops continuously at the present stage,is briefly introduced.Then,GAMIT software was used to solve the tropospheric delay of IGS station,and different projection function models and parameters were selected for comparative analysis.The difference between the calculation results and IGS station was compared and analyzed,so as to provide reliability analysis for the data and parameters of the model.Then,the tropospheric delay was obtained by solving the data of suzhou CORS station with GAMIT software.Combined with the support vector machine algorithm,the support vector machine model was established and taken as the research object.The troposphere is assumed to be an infinitely thin monolayer,and then the puncture point coordinates are taken as the input and the corresponding tropospheric delay as the output to establish the support vector machine model.A site puncture point coordinate is selected in the region and the tropospheric delay corresponding to the site is estimated.Through comparative analysis,the model estimation accuracy can be obtained within 2cm.Fig.19 table 18 reference 80... |
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