单标三角高程法跨河水准测量设计与实验分析

Design and Experimental Analysis of Trigonometric River-crossing Leveling Based on Single Sighting Target

针对现行规范中2 km以上距离的三角高程法跨河水准测量应采用双觇板的规定,进行了单标三角高程法跨河水准测量的观测设计,并通过实验与双标三角高程法及已知高差进行比较分析。结果表明:单标三角高程法可用于2 km以上距离的跨河水准测量,其半测回中的垂直角观测组数宜增至双标法的2倍。

Aiming at the prescription in the current specification which double sighting targets should be used in trigonometric river-crossing leveling over the distance of 2 km, the measuring design for rivercrossing trigonometric leveling using single sighting target was made, and then two experimental comparison and analysis between the single target method with the double target method as well as the known height difference were taken. The results showed that single target trigonometric leveling could be used for river-crossing leveling on the distance of over 2 km, and the number of observation group in a half observation set of the vertical angle should be increased to two times of that of the double target method.