研究目的：在满足CPIII网点间相对点位精度要求的前提下, 在CPIII网实测数据添加符合正态分布的随机误差, 以此来模拟2C互差值, 同时采用边角网间接平差的严密精度估算方法, 探究2C互差对CPIII平面网主要精度的影响。
研究结论: 根据无碴轨道CPIII平面网外业观测的方法和特点以及测量现状, 通过添加符合正态分布随机误差的方法, 模拟2C互差值, 并采用某客专的部分数据进行了仿真计算。通过对结果的分析, 证明了2C互差对CPIII平面网的主要精度有一定的影响, 然而, 在起算数据精度较好和投影变形较小的前提下, 通过本文的研究认为可以适度放宽2C 互差的限差至15″, 这时CPIII平面网的主要精度指标仍能满足规范的要求, 这样的话放宽2C 互差的限差指标可提高CPIII平面网的测量效率, 也为高速铁路工程测量规范的修订与完善提供基础资料。
Research purposes: The random error wh ich conformed to the norm al d istr ibution w as appended to the observed date o f CPIII netw ork to simu late the 2C mutua l dev iat ion under the prem ise o f meeting the requ irement o f re lative po int position accuracy of CP?? ne tw ork, and also the tight and precise est imation method for calcu lation of the indirect ad justment ofm arg in netw ork w as used for exp loring the impact o f 2C mutual dev iation on the accuracy o f CPIII plane netw ork.
Research conclusions: The va lue of 2C mutua l deviat ion w as simulated by add ing the random error confo rmed to the norma l distribu tion, and the simu lation calcu lation o f the partia l date of one passenger dedicated line w as made,acco rd ing to the fie ld observationm ethod and features as w e ll as measurement situat ion of ballastless track CPIII p lane netw ork . The ana lysi resu lt show ed the 2C mutua l deviat ion has certain impact on the accuracy o fCPIII plane netw ork. But under the prem ise o f hav ing good in itial calcu lation data and little pro ject ion distort ion, the main measurement prec isions o f CPIII p lane netwo rk could meet the specificat ion requ irement by w iden ing the 2C mutual dev iation to 15 seconds. Such w idening the 2C mutual dev iation cou ld enhance the measurement efficiency o f CPIII p lane netw ork and prov ide he fundam enta l data for the rev ision and improvement o f the eng ineering survey specif ication for h igh- speed ra ilw ay.
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