分群现象中大气折光改正模型研究分析

Research and Analysis of Atmospheric Refraction Correction Model in Clustering Phenomenon

通过研究分析3种大气折光差改正模型,在经典模型下分别计算了高精度水准测量中分群现象的大气折光差。结果表明大气折光差对高精度水准测量影响误差较大,虽然不同改正模型误差各异,但均与观测时的气压、温度、坡度、视线长度、测站高差有关。实测气压、温度,缩短视线长度,提高视线高度将有利于削弱大气折光差的影响。

In this paper,we studied and analyzed three kinds of atmospheric refraction correction models systematically.Under the classical mod-el,we calculated the atmospheric refraction of clustering phenomenon in high precision leveling respectively.The results show that the atmo-spheric refraction has a great influence on the high-precision leveling.Although the errors of different correction models are different,they are all related to the air pressure,temperature,slope,line of sight length and station height difference.The measurement of air pressure and temperature,shortening the line of sight length and increasing the line of sight height will help to weaken the influence of atmospheric refraction.