Building measured atmospheric refraction delay model using astronomical observation

Abstract：The neutral atmospheric delays is an important error source in the space geodesy.The perfecting to the theory of atmospheric refraction can not only improve computing precision of data processing, but also can reduce instrumental cut-off elevation and make the best of instruments.This paper investigated the basic concept and theoretical method of atmospheric refraction delay, and indicated that nowadays all refraction delay correction models are depend on atmosphere distributing model.The differences between mapping functions only is modal and haven't distinguish in substance.It is the main reason that the precision of atmospherical refraction delay still can not be improved at present.Via simulation reckoning, which using the tabled datum of atmosphere refraction values, the use of surveying values of atmosphere refraction to simulate refraction delay is proved feasible, and all parameters in atmosphere delay correction model can be obtained.Meanwhile, the format of mapping function is indicated secondary, which along with increase of terms in continue fraction, and the precision in simulation process can be improved.Based on surveying value of atmosphere refraction, an approach of establishing the surveying correction model of neutral atmosphere refraction delay has been given.

Keyword：zenith delay;mapping function;measuring model;