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《Journal of Southwest Jiaotong University》 2008-06
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Simulated Determination of Accuracy Requirement for Control Points Ⅲ Intersection Networks in High-Speed Railway

LIU Chenglong,YANG Youtao,XU Xiaozuo(School of Civil Eng.,Southwest Jiaotong University,Chengdu 610031,China)  
To meet the accuracy requirement of relative positioning,it is necessary to perform the further investigation on the form of CPⅢ(control points Ⅲ) control networks and the precision evaluation of observations from field surveying.By combining the standard with the improved forms of CPⅢ control networks,a rigorous method for accuracy estimation based on the parameter adjustment of side-angle measurement network was proposed.A simulated test was performed to investigate the relative accuracy between points,and the necessary precision assessment for field observations was further discussed.The research result shows that the azimuth measurement accuracy of less than ±1″ and the distance measurement accuracy of less than ±(1+1×10-6) mm in a high-speed railway system are respectively required.The research provides a reference for the revision of the present measurement specification for high-speed roadway and the selection of surveying methods for ballastless track.
【Fund】: 国家自然科学基金资助项目(50478085)
【CateGory Index】: P228.4
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