Preliminary evaluation of atmospheric mapping functions based on numerical weather models
نویسنده
چکیده
Mapping of the zenith hydrostatic delay at radio frequencies to elevations as low as 3° has been improved by making use of the in situ atmosphere state. This information might be obtained from a numerical weather model, thus providing better atmosphere calibration on a global scale. The new model has been evaluated by comparing the repeatability of the lengths of baselines measured by Very Long Baseline Interferometry for a limited set of high accuracy experiments from 1994 January. The improvement compared to using the Niell (1996) mapping function, though significant, is less than expected, indicating other sources of unmodeled error.
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