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《Science of Surveying and Mapping》 2010-01
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Surveying method for building control benchmarks for ballastless track

REN Zi-zhen①,CEN Min-yi①,LU Jian-kang②,ZHANG Tong-gang①(①Southwest Jiaotong University,Chengdu 610031,China;②China Railway Eryuan Engineering Group Co.Ltd,Chengdu 610031,China)  
In the ballastless track construction,the high smooth of track demands that the mean square errors of angle between three control benchmarks should not be larger than 8 seconds.It is essential to do some researches on surveying method for building control benchmarks because the surveying method directly affects orientation precision of control benchmarks and the cost of control net can be reduced by using a high precision surveying method in a certain condition.Based on full precision calculating models of control benchmarks,this paper compares two surveying methods of control benchmarks,polar coordinate method and traverse method,depending on the mean square errors of angle between three control benchmarks through simulated experiments.The experimental results show that,by considering the initial data errors,the polar coordinate method is difficult to meet the demand of high smooth of ballastless track,but the traverse method attached to control nets can do it.
【CateGory Index】: U212.2
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