Application of the Qianxun SI CORS-RTK in the Foundation Pit Staking

For the problem that the target lofting area is blocked by the wall and the base station is located at the center of the road, the traditional total station lofting method and the single-base CORS RTK lofting method cannot be used. Qianxun SI service system and the network CORS-RTK method are used to stake out the foundation pit in the engineering construction. The principle and advantages of the network CORS are introduced, and the data of the lofting points are processed and the lofting accuracy is analyzed in the paper. The results show that the plane coordinates of 37 lofting points are measured by RTK, the error in the X direction within 20mm is 97％, the error in the Y direction within 20mm is 100％, which is relatively concentrated and stable; 95％ of the error in the position is less than 20 mm, 5％ of the error in the position is 20-40mm, the error in the measurement point of the CORS-RTK method meets the accuracy requirement of less than 70 mm in the plane point required by the National Satellite Positioning City Measurement Technical Specification CJJTT73 2010. The CORS measurement of Qianxun SI meets the accuracy requirements of engineering specifications and is of great significance for reducing the workload of engineering construction.