摘要
根据三角高程测量原理与误差传播定律及分配原则,推导了大气折光系数反演模型。利用高低棱镜同时对向观测方法,对一个测段上具有偶数条边的闭合网进行观测,消除了仪镜高测量带来的误差。提出了利用闭合网高差闭合差为0及影响参数比例误差的分配原则,采用周期图法求定各方向大气折光系数改正值的方法,提高了三角高程测量精度与可靠性。通过对某大型悬索桥施工监控中塔顶一点的三维坐标分量24 h连续监测,其空间几何关系和塔柱的饶度变化完全满足理论变化特征;塔柱各断面应力实测值与空间状态理论应力计算值标准偏差在0.015内,大大优于设计精度要求,验证了此测量方法的正确性。
Atmosphere refraction coefficient inversion model was deduced according to trigonometric leveling theory, error transmission law and error distribution principle. A simultaneous subtending surveying method with high-low prism was used to survey a closed control network with even number sides on a surveying segment and eliminate the error resulting from measuring the height of instrument and prism. The trigonometric leveling surveying precision and reliability were increased by using periodogram method to calculate correction values of atmospheric refraction coefficients according to the influencing parameter proportion error distribution law and the proposition that closing error of closed network elevation difference is zero. The 24-hour survey on 3D coordinate components of a surveying point on the tower top of a great suspension bridge shows that the space geometrical relationship and tower distortion changing are consistent with the theory change characteristics. The standard deviation between stress surveying ata of all sections of post and spatial theoretical stress calculated value is within 0.015, which verified the correctness of the method.
出处
《公路交通科技》
CAS
CSCD
北大核心
2009年第6期93-97,共5页
Journal of Highway and Transportation Research and Development
基金
教育部重点实验室基金资助项目(080105)
关键词
桥梁工程
大气折光修正
周期图方法
三角高程测量
悬索桥
bridge engineering
atmosphere refraction correction
periodogram method
suspension bridge
