测距三角高程法在轨交崇明线跨河水准测量中的研究和应用  

Research and Application of Trigonometric Leveling in River-crossingLeveling for Chongming Metro Line

作　　者：刘超 LIU Chao(Shanghai Surveying and Mapping Institute,Shanghai 200063,China)

机构地区：[1]上海市测绘院,上海200063

出　　处：《城市勘测》2023年第2期135-139,共5页Urban Geotechnical Investigation & Surveying

基　　金：上海市2021年度“科技创新行动计划”社会发展科技攻关项目资助(21DZ1204100)。

摘　　要：通过对测距三角高程法在长距离跨河水准测量中的主要误差来源进行研究分析,针对性地提出了提高高程传递精度的具体措施,并在上海轨道交通崇明线工程中进行了验证。工程应用结果表明,选择地形地貌相似的跨河场地、保证较小的测站高差,并采用特制的觇灯在适宜的天气条件下进行同步对向观测,可以极大地削弱垂直角和大气折光对跨河水准高程传递精度的影响,使得测距三角高程法达到国家二等水准测量精度,更加成熟地应用于高精度、长距离的跨河水准测量。This paper analyzed the main error sources of trigonometric leveling method in long distance river-crossing leveling,and put forward specific measures to improve the accuracy of elevation transfer,which is verified in the Shanghai Chongming Metro Line Project.The results show that the errors of vertical angle and atmospheric refraction can be greatly weakened.The specific measures include selecting a river-crossing site with similar topography,ensuring a reasonable height difference between stations and adopting special target lamps.In addition,the synchronous opposite measurements should be adopted in suitable weather.Under the circumstances,the trigonometric leveling method can achieve the equivalent accuracy of the national second-class leveling to meet the requirements of long distance and high precision river-crossing leveling.

关 键 词：测距三角高程法 长距离跨河水准测量 二等水准 误差来源 

分 类 号：P258[天文地球—测绘科学与技术]