天文大气折射改正模型比较分析

天文大气折射一直是影响天文测量精度的主要因素之一,针对光学天文测量中大气折射的问题,主要介绍、归纳了几种在处理天文大气折射改正中常用的模型,并比较分析了标准大气条件下不同模型的改正效果,为天文大气折射模型改正的进一步研究提供基础。结果表明:在天顶距不大于60°的情况下,不同方法之间差异性很小,但随着天顶距的增大,不同方法的差异增大。对于高精度天文测量,需要寻求一种精度高、实用性强的处理方法对天文大气折射的影响进行改正和计算。 

Comparison and Analysis of Astronomical Refraction Correction Model

Atmospheric refraction is one of the main factors which affecting the accuracy of astronomical measurement all the time. The paper introduces and summarizes several commonly used models in computing atmospheric refraction corrections, compare and analysis the effect of different models under standard atmospheric conditions. It shows the difference between different methods is very small when the zenith distance is smaller than 60°, but with the increase of zenith distance, the difference of different methods increases. High precision method must been setup for high precision astronomical measurements.