文章基本信息

标题：Application of ray-tracing through the high resolution numerical weather model HIRLAM for the analysis of European VLBI
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作者：S. Garcia-Espada ; R. Haas ; F. Colomer 等
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2010
卷号：2010
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The tropospheric effects caused by the neutral atmosphere are an important limitation on the precision of results obtained using space geodetic techniques like VLBI and GPS. In recent years numerical weather models (NWM) have been applied to improve mapping functions which are used for tropospheric delay modeling in VLBI and GPS data analyses. A method for a direct calculation of the slant delay via raytracing through the 3D-VAR HIgh Resolution Limited Area Model (HIRLAM) for numerical weather prediction (NWP) is developed and applied to the analysis of geodetic European VLBI data. The advantages of the HIRLAM model are the high spatial resolution (0.2◦x0.2◦) and the high temporal resolution in prediction mode (3 hours). As a result of using raytrace delays for the VLBI data analysis, estimated zenith wet delays (ZWD) are smaller than those using the standard Niell Mapping Function (NMF). Baseline repeatability improves with the HIRLAM approach for cut-off angles higher than 19◦.