“自由设站”法实现跨河水准测量技术分析与应用

Analysis and application of cross-river leveling technique by“free station setting”method

针对现有三角高程跨河水准精度较差、观测效率低下的问题,基于测距三角高程原理,经过严密的理论推导和研究,提出“自由设站”三角高程法进行跨河水准测量的方法,分析该观测方法的主要误差来源,该方法通过减少设站次数大幅度缩短观测时间,观测过程中采用同时对向观测的方法削弱球气差的影响,经过实例的验证,表明“自由设站”三角高程法具有一定的可靠性和有效性,在保证精度的同时显著提高观测效率,成果满足国家二等水准测量的检核要求。

Aiming at the problems of poor accuracy and low observation efficiency of existing trigonometric level crossing river,based on the principle of distance trigonometric level and through rigorous theoretical derivation and research,this paper puts forward the method of“Free Station Setting”trigonometric level for cross-river level measurement,analyzes the main error sources of this observation method,and greatly shortens the observation time by reducing the number of station setting.In the process of observation,the simultaneous direction observation method is used to weaken the influence of spherical air difference.The example verification shows that the“Free Station Setting”triangular elevation method has certain reliability and effectiveness,which can ensure the accuracy and significantly improve the observation efficiency,and the results meet the national second-order leveling inspection requirements.