Improvement Of GPS Online Data Processing Technology And System Implementation

GPS on-line data processing system aims to provide users with high-precision automatic GPS data processing services through the network platform,so that users can get high-precision solution results without mastering the principle and calculation method of GPS.Relevant scholars and research institutes at home and abroad have tried and established a series of online GPS data service.There are many mature GPS online data processing systems in foreign countries and provide services,but in China,there are no relevant services officially launched.However,when domestic users use the existing GPS online data processing system,there are some problems,such as the inconsistency of coordinate frame with domestic,the high delay of network access,and the decline of the accuracy of domestic data processing.Therefore,it is particularly important to build GPS online data processing service based on domestic reference station data.Based on the CORS network observation station in Jiangxi Province,this paper designs the GPS on-line data processing service system,realizes the automatic and fast calculation of GPS data,improves the selection of regional reference stations and the data conversion method of Trimble receiver,and improves the accuracy of the observation data solution.The main contents of this paper are as follows:(1)Choose Jiangxi CORS station as reference station to build GPS on-line data processing system.The quality qualified observation data in Jiangxi Province can reach the accuracy of 3 mm in X direction,6 mm in Y direction and 4 mm in Z direction.(2)In view of the longitude and latitude range of Jiangxi Province,the Delaunay triangle-based reference station selection method is adopted,which improves the accuracy of the calculation results by 1.8 times compared with the nearest station selection method.(3)Aiming at the data loss caused by the batch conversion method of Trimble receiver,a new RT-T conversion method is proposed,and the effective conversion rate of observation is 100%.The research shows that the data processing system can run normally,and the site selection method based on Delaunay network can improve the accuracy of calculation results.In Jiangxi Province,the data conversion method used by Auto-EGG,an online GPS data processing system,can completely retain the original observation data.