A Possible Means of Improving the Accuracy of Refraction Delay Correction of Neutral Atmosphere |
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| Institution: | 1. National Astronomical Observatories/ Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011;2. Department of Territorial Information and Mapping Engineering, Xuzhou Normal University, Xuzhou 221116;3. Institute of Information Engineering and Automatization, Kunming University of Science and Engineering, Kunming 650041;1. Department of Chemistry, University of Washington, Seattle, WA 98915, USA;2. Department of Physic, Kharkov Fire-Technical Academy, 61-000 Kharkov, Ukraine;3. Institute of Chemistry, Jan Kochanowski University, 5 Checinska Street, 25-020 Kielce, Poland;1. Geodesy and Geodynamics Laboratory, Institute of Geodesy and Photogrammetry, Swiss Federal Institute of Technology, ETH Hoenggerberg, HPV G56, Schafmattstrasse 34, 8093 Zuerich, Switzerland;2. Swiss Federal Office of Topography, Geodetic Bases and Permanent Networks, Wabern, Switzerland;3. Federal Office of Meteorology and Climatology, Zuerich, Switzerland;2. Ingenieria y Servicios Aeroespaciales, INSA, Paseo del Pintor Rosales, 34-Bajo, 28008 Madrid (España), Spain;1. Department of Ecology & Biodiversity, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, PR China;2. The Swire Institute of Marine Science, The University of Hong Kong, Shek O, Cape d’Aguilar, Hong Kong SAR, PR China;3. Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, PR China;1. Department of Botany, The University of Hong Kong, Pokfulam Road, Hong Kong;2. School of Food Science, South China University of Technology, Wushan Road, Tianhe, Guangzhou 510641, China;3. Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong |
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| Abstract: | The space geodetic technology requires an accurate model of correction of refraction delay by the neutral atmosphere that varies from one observing station to another, and from one azimuth to the next. It is pointed out that under the present condition the astronomical refraction can not yet be directly determined, any correction model because of its high dependence on the assumed atmospheric distribution, is incapable of achieving the required accuracy or of improving the cut-off altitude. In this paper, based on the special properties of the lower latitude meridian circle at Yunnan Observatory and our experience of determining atmospheric refraction therewith, a new method is proposed for improving the accuracy of refraction delay correction. Namely, the measured data of astronomical refraction of an observing station from near zenith to low altitudes in different azimuths are used to evaluate the refractivities and the parameters of the mapping functions, thereby establishing a model of atmospheric refraction delay correction that varies with the observing station and the azimuth. Since it is unnecessary for the new method to adopt any atmospheric distribution model, application of this new method will improve correction accuracy of refraction delay to better than 1mm at zenith and to centimeters at low altitudes, and improve the cut-off altitude to below 5 degrees. |
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