测距三角高程法实现长距离跨河水准测量的探讨

Application of the trigonometric leveling method to long-distance river-crossing leveling

从三角高程测量单向观测的高差计算公式入手,分析了三角高程测量的误差来源,推导了跨河水准网中测距三角高程的精度估算公式;在此基础上,结合项目使用的仪器进行精度估算,探讨了九江长江二桥跨河水准的可行性.依据跨河水准测量的特点,利用T3经纬仪和徕卡TC905全站仪完成了九江长江二桥的跨河水准测量.

Based on the computational formula of the orthometric altitude difference in trigonometric leveling nonreciprocal obser-vation,the error sources of trigonometric leveling are analyzed.Then the precision estimation formula of trigonometric leveling for river crossing leveling is deduced.On the basis of the above research,estimate the accuracy and the possibility of river crossing leveling in the Yangtze River Second Bridge at JiuJiang,and accomplished the river crossing leveling with T3 theodolite and Lecia TC905 total station insrument.