Statistics – Computation
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008acasn..49..216m&link_type=abstract
Acta Astronomica Sinica, vol. 49, no. 2, p.216-223
Statistics
Computation
Astronomical Instrumentation, Methods And Techniques: Atmospheric Effects, Astrometry
Scientific paper
The series expansion method and mapping function expansion method for astronomical refraction are analyzed in this paper. It is shown from the comparison between those two methods that the computational accuracy from the former one is not lower than that from the latter for a certain refraction model. The series expansion method in the theoretical derivation is often lower in astringency because of various approximations. It is also analyzed that the actual situations on the generator function method in the astronomical refraction mapping function can not indicate the characteristic of the geophysics and atmospheric physics. It is pointed out that the previous refraction model was built using a specific atmospheric model in a certain place and it is not suitable for all places, in particular, it can not be used judging other refraction model. The key to improve the correction accuracy is that the effective methods must be used while to determine directly the instantaneous refraction values and to build the azimuth-dependent observational model of the astronomical refraction.
Mao Wei
Tie Qiong-Xian
Yang Lantian
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