Research On The Affected Factors Of Positioning Accuracy And Network Transmission Of GNSS Data In Network RTK

By means of experiment and theory analysis methods, two key issues:the positioning error factors analysis and the network communication protocols of Network RTK system are mainly studied based on the single reference station system experimental platform which was independently established and the research environment of Beijing CORS.This dissertation put forward the opinion that the performance of Network RTK can be promoted by determining the regional spatial characteristics factors which influenced positioning accuracy and adopting the pertinence measures. On the basis of the comprehensive discussion of NTRIP system architecture and working principle, Trimble GPSBase data processing software was combined with GNSS Internet Radio software to implement NTRIP protocol, by which the problems during the GNSS data network transmission process, such as longer differential delay and positioning instability were successfully solved. The GPS drilling guidance prototype system used this proposed method is also presented to verify the correctness of these theories and approaches.