Research On Dynamic And Static Positioning Accuracy Of The Single Base Station CORS System

With the rapidly development and maturity of the satellite positioning technology,various augmentation technologies have been continuously developed and gradually become one of the research hotspot in the field of GNSS applications.Based on the characteristics and advantages of GNSS positioning,the applications in the field of sea,land and aerospace is more and more extensive.As a system integrate computer,communication,satellite positioning and network technology,the CORS system uses network RTK technology to achieve the higher precision positioning,and it has been rapidly integrated into all walks of life.At the same time,as a ground augmentation method,the CORS system not only improves the accuracy of positioning,but also reduces the cost,and brings higher working efficiency and more convenient working means for users.At present,with the construction of Beidou satellite navigation system and the development of domestic comprehensive technical level,China has initially realized the networking work of domestic CORS.Compared with the network CORS system,the single base station CORS is more suitable for small and medium-sized cities and some engineering operations.Especially for the general aviation and civil aviation academy,in the respects of aircraft's take-off and landing,vehicle scheduling,airport scene monitoring,single base station CORS has more obvious advantages and application prospects than network CORS.It not only has low construction cost,and it also can save a lot of manpower and material resources for the later management and maintenance.This paper has taken active part in the whole construction process of the school single-base station CORS system.Based on the single-base station CORS system(CAFUC-CORS)of the Civil Aviation Flight University of China,the experimental research on dynamic and static positioning accuracy is carried out,and the static and dynamic real-time positioning accuracy of the system are analyzed.The main work content and research results of the thesis are as follows:(1)Participate in the construction of the single base station system of the school,introduce the construction process in detail,and summarize the construction program.(2)According to the design idea of satellite signal mark and the principle of data segmentation,based on the object-oriented programming idea of.net,the decoding idea,process and implement method of RTCM3.2 are proposed,realizing the real-time and completeness of each field of the message.(3)Through the static positioning experiment of CAFUC-CORS system,the statistical analysis of the internal and external accuracy of the system is completed,and then judging whether it meets the expected accuracy of the single base station system.(4)According to the conventional dynamic positioning test method,based on the trajectory total least squares algorithm,the fitting model is established.And a method of dynamic real-time positioning accuracy based on the fitting trajectory is proposed The dynamic real-time positioning accuracy of CAFUC-CORS system is analyzed,and then using a certain method to test and verify the accuracy.