Analysis of the Influence of Domestic Mainstream RTCM Differential Data on RTK Positioning Results

In China, most provinces have established mature Continuous Operational Reference Systems (CORS) base stations, and enterprises such as Qianxun Spatial Intelligence Inc., (hereafter called Qianxun), China Mobile, and Six Points Technology have all deployed CORS sites one after another. Throughout this paper, the problem of differences in the accuracy of differential corrections broadcast by different types of CORS base stations is addressed, affecting Real Time Kinematic (RTK) positioning. As examples, CORS base stations of Qianxun and China Mobile broadcast differential data, and the same type of receivers are used to collect RTCM3 differential data, static raw data of mobile stations, and GGA data with similar baseline distances. After decoding the raw data, the ionospheric delay and tropospheric delay after double-differenced are back-projected through the combination of the ionosphere free, and time series graphs of their different time periods are obtained to compare the differences of RTCM3 differential data broadcast by different types of base stations. As a result of the method presented in this paper, it is possible to assess how ionospheric and tropospheric delay errors, along with other factors, affect real-time positioning accuracy in mapping, unmanned vehicles, and other fields. This is of great benefit for improving real-time positioning accuracy.