跨海桥梁GPS高程拟合方法  

GPS elevation fitting method for sea-crossing bridge

作　　者：吴迪军[1] 熊伟[1] 

机构地区：[1]中铁大桥勘测设计院集团有限公司,武汉430050

出　　处：《测绘科学》2017年第6期125-129,共5页Science of Surveying and Mapping

基　　金：中国中铁股份有限公司科技开发计划项目(2012-重大-2)

摘　　要：针对跨海桥梁高程基准传递的技术难题,该文阐述了GPS高程拟合的基本原理,分析了高程拟合中的几个关键技术问题,总结出了GPS高程拟合的技术要点及提高拟合精度的措施。提出了基于二次多项式曲面的跨海桥梁工程GPS高程拟合方法,利用港珠澳大桥工程区域内的21个高精度GPS水准点建立二次多项式曲面拟合模型,并用另外7个点进行检核。结果显示:模型的内符合精度为±8.7mm,外符合精度为±12.4mm,2个海中测量平台控制点的拟合高程达到二等水准测量精度要求。Aiming at the difficult technical problem of elevation transfer for sea-crossing bridge engineering, the basic principle of GPS elevation fitting method was described. Some key techniques of elevation fitting were analyzed, and the technical points of GPS elevation fitting and the measures to improve the precision of the fitted elevation were summarized. Then the GPS elevation fitting method based on conicoid fitting was put forward for sea-crossing bridge engineering, and the conicoid fitting model was built up by using 21 accurate GPS levelling points within the construction area of Hongkong-Zhuhai-Maocau Bridge, with other 7 points for checking. The result showed that the internal compliance precision of the model is 8. 7 mm, and the external compliance precision of which is 12.4 mm, and the accuracy of fitted elevation of 2 control points on survey platforms in the sea reaches accuracy standard of the second order levelling.

关 键 词：跨海桥梁 GPS高程拟合 二次曲面模型 港珠澳大桥 

分 类 号：P228.4[天文地球—大地测量学与测量工程]