摘要
铁路工程控制网三网合一,采用GNSS卫星导航定位基准站(CORS)方式建网是发展的趋势,但其长距离、带状布设的控制网要确保高精度且连续均匀,具有一定的难度。针对长距离带状控制网的特点,分析影响GNSS控制网解算的影响因素,引入IGS站点坐标的松弛约束,筛选出优化解算策略:融合多星座卫星观测数据,基于电离层约束模型求解宽巷模糊度,当控制网的基线长度小于100 km时,对流层延迟采用站间差分改正、电离层延迟采用差分或模型改正,并结合环境条件顾及其他负荷改正。实际铁路工程带状控制网解算测试表明,优化策略控制网处理精度相较于常规策略在Y和Z方向上提升2~5 mm。通过对复杂地形环境下长距离带状控制网的解算质量分析,进一步表明该策略可优化铁路工程长距离带状控制网高精度解算性能。
It is the trend of development for railway engineering control network to be triple-netted and built by GNSS satellite navigation and positioning reference stations(CORS),but its long-distance and strip-layout control network has certain difficulties to ensure high accuracy and continuous uniformity.For the characteristics of the long-distance strip control network,the influencing factors affecting the GNSS control network solution are analyzed,the relaxation constraint of IGS station coordinates is introduced,and the optimal solution strategy is figured out;by fusing multi-constellation satellite observation data,the wide alley ambiguity is solved based on the ionospheric constraint model;the tropospheric delay is corrected by inter-station differential correction and the ionospheric delay is corrected by differential or model correction when the baseline length of the control network is less than 100 km,and other load corrections are also taken into account in conjunction with environmental conditions.The actual railway engineering strip control network solution test shows that the optimized strategy control network processing accuracy is improved by 2~5 mm in Y and Z directions compared with the conventional strategy.The analysis of the solution quality of long-distance strip control network in complex terrain environment further shows that the strategy can optimize the high-precision solution performance of long-distance strip control network for railway engineering.
作者
严冬
李剑锋
梅熙
冯威
黄丁发
YAN Dong;LI Jianfeng;MEI Xi;FENG Wei;HUANG Dingfa(Center for Satellite Navigation,Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 610097,China;Faculty of Resources and Environment,Chengdu University of Information Technology,Chengdu 610225,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)
出处
《铁道标准设计》
北大核心
2024年第4期55-62,共8页
Railway Standard Design
基金
国家自然科学基金项目(42171429)
四川省科技计划项目(2020GZYZF0010)
成都信息工程大学科研基金项目(KYTZ202114)。
