摘要
传统的跨河水准测量方法以几何光学观测为基础,受距离和气候条件的影响显著,工作效率较低。GPS技术所具有的三维定位功能,以其快速、全天候测量的优点,为跨河高程测量提供了一条新的途径。本文针对桥梁工程特点,探讨了GPS跨河水准测量的基本原理和方法,采用线性拟合模型推求跨河点之间的高程异常差,再结合GPS大地高即可求得跨河高差。在安庆长江铁路大桥精密控制网测量中,进行了二等GPS跨河水准测量试验,采用测距三角高程法进行验证,较差为4.7mm。
The traditional method of river-crossing leveling based on geometric optical measurement which is influenced by the distance and weather conditions significantly and have lower efficiency. GPS technology provides a new approach of river-crossing level- ing which has three-dimensional positioning function with the advantages of quickly and all-weather measurement. According to the fea- tures of bridge engineering, the basic principles and methods of river-crossing leveling was introduced firstly in the paper. The linear fitting model was applied to estimate the height anomaly difference between the river-crossing points, and then combining with the GPS geodetic height, the river-crossing height difference was obtained. Finally the second order GPS river-crossing leveling experiment was carried out in the high precision control network for Anqing railway bridge over Yangtze river, which was validated by trigonometric lev- eling, and the difference is 4. 7mm.
出处
《测绘科学》
CSCD
北大核心
2012年第2期100-102,共3页
Science of Surveying and Mapping
关键词
跨河水准测量
安庆长江铁路大桥
GPS高程
river-crossing leveling
the Anqing railway bridge over Yangtze river
GPS elevation
