Research On SZBDCORS Positioning Accuracy

Continuously Operating Reference Stations is one of the hot spots of contemporary GNSS technology.In order to promote the development of China's Beidou navigation industry,SZCORS(Shenzhen Continuously Operating Reference Stations)has been upgraded to multi mode Continuously Operating Reference Stations compatible with Beidou satellite navigation system,GPS and GLONASS satellite navigation system(Shenzhen Beidou Continuously Operating Reference Stations,SZBDCORS).In order to ensure that SZBDCORS can provide a variety of services quickly and efficiently,the completeness of the system must be tested,and the positioning accuracy is the most important index to measure the reliability of the system.It is very important to master the accuracy of RTK combined positioning in Beidou multi-mode network,which can improve the performance of Beidou high precision real-time positioning.By combining the theory and the practice focuses on research and analysis of SZBDCORS real time positioning accuracy,and through in-depth study on error sources of CORS positioning system,put forward the effective solution to further improve the positioning accuracy of the SZBDCORS system,the better service has important significance to service the majority of users of the system.The main research work and research contents of this paper are as follows:(1)Investigated and studying the development of CORS system at home and abroad and the research status of scholars at home and abroad on improving the positioning accuracy,and systematically discussing the basic principle of RTK network and the detailed research and analysis of the principle and characteristics of several kinds of network RTK technology in today's mainstream.(2)Through the analysis of the main error sources of GNSS positioning and the methods to eliminate or weaken the influence of positioning accuracy,the method of eliminating or weakening the influence of error in CORS positioning was proposed,and the main error of CORS network was further analyzed.(3)This paper expound in detail the principle,system constitution and application method of SZBDCORS system.In order to analyze the positioning precision of the system,through the system and peripheral CORS station to connect CGCS2000 coordinates results of each base station,the establishment of a national2000 coordinate reference frame,and the post static precision positioning performance and multimode network RTK real-time positioning accuracy wereanalyzed and evaluated.(4)To determine the spatial factors influencing the precision of SZBDCORS system related analysis using the method of mathematical statistics,this paper analyzed the terrain and spatial location and positioning accuracy of SZBDCORS measurement area through correlation hypothesis test for categorical data,and put forward new ideas to further improve the system accuracy.