论起算点更新方法对城市轨道交通基础控制网成果的影响  

Discussion on the Effect of Starting Point Update Method on the Achievements of Urban Rail Transit Basic Control Network

作　　者：张旭东[1] 胡在凰 ZHANG Xudong;HU Zaihuang(Ningbo Institute of Surveying and Mapping,Ningbo 315042,China)

机构地区：[1]宁波市测绘设计研究院,浙江宁波315042

出　　处：《测绘地理信息》2022年第S01期216-218,共3页Journal of Geomatics

基　　金：宁波市科技局软科学课题(2017A10066)

摘　　要：基于统一限差法判定宁波市城市轨道交通首级控制网(简称框架网)点的稳定性,并利用原成果重新对基础控制网历期复测数据进行平差。对比结果表明,相比统一限差法,框架网采用全更新法会给下一级基础控制网点位成果带来平均约0.7 cm的影响,随后随着时间推移,影响程度扩散到大部分点位中,最大值在1.5 cm以内,满足目前基础控制网更新方案的要求。对采用全更新法后的起算点进行平差,基础控制网能有更好的精度,起算点与基础控制网点之间兼容性更好。Unified tolerance method(UTM)is used to determine the stability of the first-level control network(referred to as frame network)of Ningbo urban rail transit.The original results are used to re-adjust multi-period retesting data of the basic control network.Comparative analysis results show that,compared with UTM,after adopting full update method(FUM),the frame network will bring about an average difference about 0.7 cm to the next level point location results of basic control network,and most of the points in basic control network could be affected over time.Among the points,the maximum affected value is within 1.5 cm,which satisfies the current requirements of the update scheme of basic control network results.By adjusting the starting points updated by FUM,the results of basic control network will get better precision,and the compatibility between the starting points and the basic control network points will be better.

关 键 词：轨道交通 全更新法 统一限差法 框架网 

分 类 号：U239.5[交通运输工程—道路与铁道工程]