Research On The Application Of GPS-RTK Technology In Existing Railway Elevation Survey

The maintenance and repair of existing railways need the support of high-efficient and high-precision measurement technology,and gps-rtk technology has been widely used in various stages of railway design,construction and operation with its high-precision,high-efficiency and all-weather measurement advantages.But subject to the leveling accuracy in both rail surface leveling process cannot be fully applied,how to make dynamic RTK technology combined with peripheral level point distribution,design a corresponding space fitting method,realize its application in the existing measurement to improve the efficiency of both the orbital measurement plays an important role.To this end,the paper mainly carries on the following aspects of the research work.1)design field test schemes of different operation modes and analyze the data consistency of different operation modes.A special line was selected as the test line,and the line was measured with total station,level,GPS and 3d laser scanning equipment respectively,and the line measurement data obtained from different operation modes were compared and analyzed.It can be found that the GPS measurement data has a good agreement with the line plane position obtained by the total station and 3d laser measurement,but it is not consistent with the level measurement results in elevation measurement.2)study on the fitting accuracy of gps-rtk measurement elevation data under different control conditions.Taking the measured gps-rtk elevation data of the left and right lines as the research object,and the leveling data of corresponding points as the benchmark,the elevation fitting accuracy under different control conditions is studied.The plane fitting and quadric surface fitting models are used respectively,and 1~4 control points are introduced to analyze the accuracy of elevation fitting.Through the comparative analysis of residual and internal and external coincidence precision,it is found that under certain control conditions,the quadric model is adopted to fit the GPS elevation data,which can meet the requirements of existing railway elevation survey.3)to study the existing track retargeting method coordinated by gps-rtk and uav.To Kingston railway as a test section,design total station,GPS-RTK existing railway survey method,in conjunction with unmanned aerial vehicle(uav)with GPS-RTK technology for main control points of plane and elevation information(total station measuring data as a reference datum),combined with the feature of extraction of three peacekeeping orbit of real data,using an algorithm of automatic selection range interval control points,the different control points under the condition of unmanned aerial vehicle(uav)layout precision,the integrated application of unmanned aerial vehicle(uav)with GPS-RTK technology,the measurement of both the orbit to provide some reference Suggestions.