CPⅢ高程网复测稳定性分析方法研究  

New Methodology for Stability Analysis on Repeated Measurement of CPⅢ Vertical Control Network

作　　者：刘成龙[1,2] 刘竹均 杨雪峰[1,2] 刘志[1,2] 

机构地区：[1]西南交通大学地球科学与环境工程学院,四川成都610031 [2]西南交通大学高速铁路运营安全空间信息技术国家地方联合工程实验室,四川成都610031 [3]中铁第二勘察设计院集团有限公司,四川成都610031

出　　处：《西南交通大学学报》2017年第1期91-97,共7页Journal of Southwest Jiaotong University

基　　金：长江学者和创新团队发展计划资助项目(PCSIRT)

摘　　要：针对当前规范中关于CPⅢ高程网复测稳定性分析方法存在原、复测高差较差≤2 mm的规定不合理、可能出现稳定点错判,以及规定原、复测高程较差限差≤3 mm的依据不足等问题,推导了原、复测高差较差和原、复测高程较差的合理限差,提出了对CPⅢ高程网复测的稳定性分析新方法.该方法根据CPⅢ高程网原测和复测的平差结果计算出CPⅢ高程网中所有测段的原测与复测高差较差,根据其限差指标探测出CPⅢ高程网中所有不稳定的测段;对于每一段不稳定测段中的两个CPⅢ点分别计算它们的高程较差限差,探测不稳定测段中的不稳定点,以此进行CPⅢ高程网的稳定性分析.理论分析和实测数据结果表明,CPⅢ高程网中各个相邻点间测段的原、复测高差较差限差为1.4 mm时,能够正确地探测出网中不稳定的CPⅢ点.In the current code on the stability analysis of repeated measurements for the CP m vertical control network of high-speed railways, the divergence tolerance of elevation between original and repeated measurements should be no more than 2 mm, which is not reasonable due to misjudging stable points. Besides, there is also poor evidence to set the altitude difference between original and repeated measurements to be no more than 3 mm. Thus, more reasonable divergence tolerance of elevation and altitude difference between the original and repeated measurements were deduced, and a new method on the stability analysis of CP m vertical control network was proposed. This new method calculates the altitude difference for every segment of the CP m vertical control network and detects unstable segments in the whole network according to the original and repeated measurement limits. Then, for the two CP m points on each unstable segment, the divergence tolerances of elevation were computed respectively to detect the unstable cPm points of the unstable segments and analyze the stability of CPⅢ vertical control network. Both the theoretical and test data show that when the divergence tolerance of elevationbetween original and repeated measurements for the neighboring points is less than 1.4 mm, the proposed method can reliably detect the unstable points from the CP m vertical control network. Key Words ： CP m vertical control network ; repeated measurement; stability analysis ; measured segment ; divergence tolerance of elevation; altitude difference

关 键 词：CPⅢ高程网 复测 稳定性分析 测段 高差 较差 

分 类 号：P258[天文地球—测绘科学与技术]