Other
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3101603b&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 1, CiteID L01603
Other
19
Geodesy And Gravity: Reference Systems, Geodesy And Gravity: Space Geodetic Surveys, Geodesy And Gravity: Terrestrial Reference Systems, Geodesy And Gravity: General Or Miscellaneous, Radio Science: Radio Wave Propagation
Scientific paper
In the past few years, numerical weather models (NWM) have been investigated to improve mapping functions which are used for tropospheric delay modeling in VLBI and GPS data analyses. The Vienna Mapping Functions VMF are based on direct raytracing through NWM, and so they are able to exploit the full information provided in the NWM. On the other hand, the Isobaric Mapping Functions IMF are using intermediate parameters calculated from the NWM. In this study, pressure level data from ECMWF (European Centre for Medium-Range Weather Forecasts) are applied to determine the coefficients of the VMF and the IMF. Used for the analyses of IVS-R1 and IVS-R4 VLBI sessions, both mapping functions improve the repeatability of baseline lengths (by ~10% for IVS-R1 and ~5% for IVS-R4) compared to the Niell Mapping Functions NMF.
Boehm Johannes
Schuh Harald
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