摘要
随着中国铁路建设的快速发展,部分铁路所经区域地质条件复杂,通信条件差,给传统测量方法、GNSS控制测量及网络RTK等监测方法带来极大挑战。针对该问题,将精密单点定位技术(precise point positioning, PPP)应用到铁路基础变形监测中,从传统双频定位方法出发对北斗导航系统(BeiDou navigation satellite system, BDS)系统3个频率观测数据进行两两无电离层组合,并顾及系统间差异对BDS-2和BDS-3进行联合解算,对误差采用相应的模型改正和参数估计,以实测数据进行静态和仿动态PPP实验,并对静态观测数据进行振动监测实验。研究结果表明:静态PPP实验中BDS-2、BDS-3、BDS-2+BDS-3联合解算分别能在30、21、14 min内实现三维坐标收敛,均能够达到cm-mm级定位精度,随着观测时间延长均能保持在mm级,BDS-2+BDS-3联合解算精度相较于BDS-2在E、N、U方向分别提升约37.9%、22.1%、67.9%,较BDS-3提升约18%、12.9%、11.8%。仿动态PPP实验中,BDS-2、BDS-3、BDS-2+BDS-3三维坐标收敛时间分别为45、32、28.5 min。BDS-2动态PPP精度较低且误差波动较剧烈,无法满足动态环境下的监测需求。BDS-3和BDS-2+BDS-3系统仿动态PPP在收敛后能够达到cm级精度,BDS-2+BDS-3联合PPP解算能够在28.5 min内实现三维坐标收敛,E、N、U方向相较于BDS-2分别提升了78%、65.6%、68.6%,较BDS-3提升约12%、17.4%、20.1%。综合定位性能BDS-2+BDS-3>BDS-3>BDS-2。所用方法能够有效监测出静态观测中发生的高频随机振动,为铁路基础变形监测提供有力保障。
The rapid development of China’s railway system has brought great challenges to traditional measurement methods,GNSS control measurement,and network RTK due to complex geological conditions and poor communication conditions in certain areas traversed by railways.To address such issues,Precise Point Positioning(PPP)technology was applied to railway foundation deformation monitoring.Starting from conventional dual-frequency positioning method,the triple-frequency observation data from the BeiDou Navigation Satellite System(BDS)system were combined in pairs without ionosphere,and the BDS-2 and BDS-3 were considered in a combined solution.The corresponding model correction and parameter estimation were used to correct the errors.Static and simulated dynamic PPP experiments were conducted using measured data,and vibration monitoring experiments were conducted on the static observation data.The results show that in the static PPP experiment,BDS-2,BDS-3,and BDS-2+BDS-3 can achieve three-dimensional coordinate convergence within 30,21,and 14 minutes,respectively,and can all achieve positioning accuracy of centimeter to millimeter level.With the extension of observation time,it can be maintained at millimeter level.Compared to BDS-2,the joint solution accuracy of BDS-2 and BDS-3 is higher in E and N directions.The U direction has increased by about 37.9%,22.1%,and 67.9%,respectively,which is about 18%,12.9%,and 11.8%higher than BDS-3,respectively.In the simulated kinematic PPP experiments,the convergence times of the three-dimensional coordinates for BDS-2,BDS-3,and BDS-2+BDS-3 were 45,32,and 28.5 minutes,respectively.The BDS-2 kinematic PPP has low accuracy and significant error fluctuations,which cannot satisfy the monitoring requirements in dynamic environments.The BDS-3 and BDS-2+BDS-3 systems can maintain centimeter to millimeter level accuracy after convergence,and the joint PPP solution of BDS-2+BDS-3 can achieve three-dimensional coordinate convergence within 28.5 minutes.The E,N,and U directions have improved by 78%,65.6%,and 68.6%as compared to BDS-2,respectively,and by about 12%,17.4%,and 20.1%as compared to BDS-3,respectively.Comprehensive positioning performance ranks in the descending order of BDS-2+BDS-3>BDS-3>BDS-2.The method used can effectively monitor high-frequency random vibrations that occur in static observations,providing strong support for railway foundation deformation monitoring.
作者
仇培云
廖俊源
郑健
方杨
QIU Peiyun;LIAO Junyuan;ZHENG Jian;FANG Yang(Guangzhou Metro Construction Management Co.,Ltd.,Guangzhou 510220,China;China Railway Engineering Design Consulting Group Co.,Ltd.,Beijing 100071,China)
出处
《铁道科学与工程学报》
北大核心
2025年第6期2803-2812,共10页
Journal of Railway Science and Engineering
基金
中铁工程设计咨询集团有限公司科技研究开发计划(研2023-3)。
