Browsing by Person "Zus, Florian"
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Publication Application of Global Positioning System slant path delay data for mesoscale modelverification and four-dimensional variational assimilation(2010) Zus, Florian; Wulfmeyer, VolkerObservation modeling is required in order to make use of slant path delay data, processed from ground-based Global Positioning System (GPS) measurements, for verification purposes and numerical weather prediction. A rigorous ray-tracing algorithm based on the Euler-Lagrange equation derived from Fermat's principle is developed to simulate the propagation of GPS radio signals in a mesoscale model. The ray-tracing algorithm is based on a finite difference scheme and allows the direct numerical simulation of GPS slant path delays.