An a priori Hydrostatic Gradient Model for Atmospheric Delay
Abstract
The different mean heights of the hydrostatic and wet components of the atmosphere result in significantly different mapping functions for the azimuthally symmetric distributions. Similarly, the azimuthally asymmetric distributions, approximated as simple gradients over the field of view of a VLBI or GPS antenna, require different functional dependences if the highest accuracy is to be obtained in geodetic applications. A method has been developed to determine the a priori hydrostatic gradient function from the output of a numerical weather model. A more accurate model for the wet gradient can then be used for estimating the remaining gradient component.
- Publication:
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15th Workshop Meeting on European VLBI for Geodesy and Astrometry
- Pub Date:
- December 2001
- Bibcode:
- 2001evga.conf..133N