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Ann. Geophys., 25, 1727-1734, 2007
www.ann-geophys.net/25/1727/2007/
© European Geosciences Union 2007
Preconditions to ground based GPS water vapour tomography
M. Bender and A. Raabe
Institut für Meteorologie, Universität Leipzig, Stephanstrasse 3, 04103 Leipzig, Germany
Abstract. The GPS water vapour tomography is a new technique which provides spatially
resolved water vapour distributions in the atmosphere under all weather
conditions. This work investigates the information contained in a given set
of GPS signals as a precondition to an optimal tomographic reconstruction.
The spatial distribution of the geometric intersection points between
different ray paths is used to estimate the information density. Different
distributions of intersection points obtained from hypothetical GPS networks
with varying densities of GPS stations are compared with respect to the
horizontal and vertical resolution of a subsequent tomographic reconstruction.
As a result some minimum requirements for continuously operating extensive
GPS networks for meteorological applications are given.
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