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《Journal of Railway Engineering Society》 2009-01
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Research on the Positional Accuracy Required for CPⅢ Network

CHENG Ang1,LIU Cheng-long2,XU Xiao-zuo2(1. China Railway Eryuan Engineering Group Co.Ltd,Chengdu, Sichuan 610031, China; 2. Southwest Jiaotong University,Chengdu, Sichuan 610031, China)  
Research purposes:In consideration of CPⅢ network and accuracy required for observed values, the simulated calculation on necessary positional accuracy of CPⅢ network and improved CPⅡI net form was performed. And through theoretical analysis of error, the discussions were made on the reasonable positioning precision of CPⅢ points in two circumstances and the reasonable permissible error of coordinate difference in the direction of x and y. Research conclusions:By calculating the positional accuracy required for CPⅢ control network based on the parameter adjustment of side-angle measurement network, the result shows the improved CPⅡI net form is better in integration intensity, but it is worse in positional accuracy, especially in lateral accuracy, compared with the CPⅢ network. For the CPⅢ network, the repeatable measurement accuracy should be less than ±1.5 mm and the coordinate difference tolerance should be less than ±3.0 mm in the direction coordinate of x and y. For the improved CPⅢ net form, the corresponding repeatable measurement accuracy and permissible difference should be less than ±2.0 mm and ±4.0 mm respectively.
【CateGory Index】: U212.24
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