Research On Dynamic Positioning Of GNSS Receiver Based On Fixed Track

With the increasing application of Global Positioning System(GNSS),the inspection of GNSS navigation and positioning terminals has become an important measure to ensure positioning accuracy.In the case of more extensive dynamic positioning applications,the current receiver verification method is difficult to meet the detection requirements of real-time,continuity and dynamics of the terminal.The main research work and achievements are as follows:Establish a fixed track,set up a total station on the reference point near the track,fix a base on the carrier of the track,fix the prism on the base,and measure the motion track of the carrier by means of total station and prism measurement.In order to obtain reliable reference point coordinates,three stations are set up near the track and close to each other for static measurement.Establish a fixed track,set up a total station on the reference point near the track,fix a base on the carrier of the track,fix the prism on the base,and measure the motion track of the carrier by means of total station and prism measurement.The unification of the coordinate system is completed.The coordinate sys tem involved in this paper has the WGS84 coordinate system for static measurement,and the specific local space rectangular coordinate system(NEU)related to curvature in GAMIT/GLOBK and TRACK,which are completed during data processing.The coordinate system is converted to each other and the coordinate system is unified.The dynamic positioning accuracy of the receiver is verified by the trajectory method.Using the TRACK module to compare the effects of different length baselines and different types of precise ephemeris on dynamic positioning accuracy.The average error of dynamic positioning is 3~4cm,the dynamic average error of the curve segment is about 6cm,and the point where the straight line and the curve part are lower than the average error are higher than 80%.It can be judged that the fixed track can complete the verification of the dynamic positioning accuracy.Figure28;Table23;Reference54...