Research On Calculation Strategy Of Reference Station Coordinate Based On GAMIT/GLOBK

At present,CORS has been built in most provinces and cities of central and eastern China.With the continuous improvement of the technology and function of CORS,the user's requirement for the positioning accuracy of CORS is becoming higher and higher.At present,CORS system meets the requirements of surveying data in different industries to some extent.However,due to the selection of parameters in data calculation,the results of coordinate calculation of high and stable datum stations can not be obtained,which directly affects the reliability and accuracy of the whole CORS system data.In order to improve the accuracy of datum station,it is necessary to analyze the data processing strategy.In this paper,we use different parameters,compare the results of baseline and net adjustment under different schemes,analyze the stability and precision,and obtain the optimal strategy for the coordinate calculation of the CORS reference station.The main research work is as follows:1.The strategy of calculating the baseline and base station coordinates by GAMIT/GLOBK software is studied.The parameters in the GAMIT/GLOBK software are set up,the values are selected according to different parameters,and the data analysis scheme is formulated.2.Compare and analyze the results of GAMIT/GLOBK solution under different parameters.According to the different datum station number,observation type parameter,starting point coordinate constraint and satellite cut-off height angle parameter in GAMIT/GLOBK,using standard root mean square error,baseline repetition rate and other comparison analysis base line calculation and net adjustment result,the optimal strategy of reference station coordinates solution is explored.It is concluded that using 9 IGS stations as fixed stations can provide higher resolution accuracy and stability:LC_HELP parameters are better than LC_AUTCLN in baseline solution and net adjustment;the coordinates constraint of the starting point of 0.5cm has the best solution precision in the CORS data calculation.