Algorithm Of GPS Network RTK And The Analysis Of Positioning Precision

GPS network RTK technique is a newly technique, which generated in 1990s.lt represents the heading of GPS in future. With the predominance of wide scope of operation, high accuracy, better steadily and so on, its application range and fields are extensive.On the base of the principle and ingredients of GPS network RTK system, this article mainly discusses the three algorithms: interpolation method, linear combination method, GPS virtual reference station method. Then it analyses the positioning precision of the moving station. The specific contents and the corresponding conclusions are as following:1, On the base of the analysis basic principle of GPS network RTK technique, the article mainly discusses the ingredients and their effect, and studies the merits and faults of GPS network RTK system.2, The article studies the principles of interpolation method, linear combination method, GPS virtual reference station method, deduces the formula of the three algorithm models, analyses the modes and means of canceling or weakening the GPS error, discusses the relationship of the three algorithm, and generalizes the calculation process.3, Using the real observation data of four control points from the SuTong Bridge, three as reference stations and one as moving station, the article employs the interpolation method to get the coordinate of the moving station, compiles the program to implement the interpolation method, and analyses the results of the calculation to prove the precision and the reliability of it.4, According to the requirements of setting the reference stations, the article studies the means of setting the reference stations, and then generalizes the principles of setting the reference stations.5, On the base of the three principle analysis and formula deducing, the article mainly studies the influence factors of positioning precision of the moving stations. The influencing factors mainly contains: the influence of the error of reference stations, the influence of the primary position of moving stations, the influence of the deviation of the satellites coordinate. On the base of the analysis and summarization, the article generalizes some conclusions, which are valuable of the construction and application of the GPS network RTK system.