Research On Influence Of Control Point Spatial Distribution On GPS-RTK Measurement Accuracy

As a new GPS measurement technology,RTK not only has the advantages of high positioning accuracy and fast positioning speed,but also has a new intelligent data communication function,including full function built-in radio,mobile network,intelligent dial-up and so on.GPRS communication technology is a data communication function in the network mode.In this paper,the GPS-RTK technology uses GPRS communication technology as the data link to study the influence of the spatial distribution of control points on the measurement accuracy of GPS-RTK.The main contents are as follows:In the first chapter,introducing the development history of GPS navigation system.At the same time,the development of GPS-RTK in surveying,the purpose of this paper and the technical route.The second chapter introduces the composition and basic positioning principle of GPS RTK navigation system,and expounds the basic positioning principle and theoretical algorithm of RTK carrier phase differential technology.The third chapter first introduces the distribution of control points in the experimentation area,and determines the implementation of the experiment according to the distribution,which is divided into single point correction experiment,two point correction experiment and three point calibration experiment.Set in three different coordinates of the experimental single point correction experiment,mainly in order to study the relationship between elevation coordinates in the area measurement system and measurement accuracy and experimental point calibration and measurement of the distance.The four experiment of two point correction is mainly about the influence of the distance between calibration points on the accuracy of the experimental points,and what is the relationship between the elevation and accuracy of the two correction points.The three point correction experiment mainly studies the influence of different distance on the accuracy of the experimental points in the test area.In the three point correction experiment,the one-step experiment and the seven parameter experiment mainly analyze the difference between the two points in the height error.In the fourth chapter,point accuracy is used to analyze the accuracy of the experimental points on different planes,and the accuracy of the experimental points at different heights is analyzed through elevation error.Using the broken line diagram in EXCEL,intuitively reflect the error and elevation error of every point in every experimental point,so as to analyze the accuracy distribution rule of each experimental mode.