基于i角因子改正的水准网平差方法

Adjustment Method of Leveling Network with Correction of i-angle Factor

传统水准测量为避免i角误差,通常在测量时保证前后视距相等以削弱i角误差。但通常存在复杂地形无法令前后视距相等,以及为保证前后视距相等而降低野外工作效率的问题。为此,本文介绍了一种含i角因子改正的水准网平差方法,通过计算仪器i角值改正测量高差,以提高在前后视距不等时的外业测量精度。通过实例验证,改正后的中误差值为1.2447 mm,相较于未改正的5.5278 mm有较大精度提高。

In order to avoid the i-angle error in traditional leveling,it is usually ensured that the front and back sight distances are equal in order to weaken the i-angle error.However,in some complex terrain,it is often impossible to make the front and rear sight distance equal;even in the open field of vision,in order to ensure the front and rear sight distance equal,the field work efficiency will be reduced.Therefore,this paper introduces a leveling network adjustment method with i-angle factor correction.By calculating the i-angle value of the instrument,the measurement height difference is corrected,so as to improve the field measurement accuracy when the front and rear sight distances are not equal.it is verified by an example that this adjustment method can effectively improve the leveling accuracy with unequal front and back sight distance when i angle is large.