Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29x...2t&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 24, pp. 2-1, CiteID 2149, DOI 10.1029/2002GL015982
Physics
3
Radio Science: Tomography And Imaging, Geodesy And Gravity: Instruments And Techniques, Geodesy And Gravity: Space Geodetic Surveys
Scientific paper
GPS meteorology can be successfully used to model the tropospheric refraction effect on radiowave signals. We describe an approach to estimate and model the spatial distribution of the tropospheric water vapor. We refine the tomographic software package AWATOS which is based on the assimilation of GPS double difference observations. The observations are allocated to a voxel model, which is defined according to the distribution of the GPS stations. Performing a least-squares adjustment, the refractivity of each voxel is determined. Tests of the software are performed, based on simulated and real data. The latter were obtained during a dedicated field campaign on the Big Island of Hawaii. The tomographic profiles are compared with radiosonde data. The results obtained for continuous atmospheric conditions fit well, whereas larger differences occur in discontinuous atmospheric weather conditions. Overall, an accuracy of 5-20 ppm (refractivity units) has been achieved.
Bürki B.
Cocard Marc
Geiger Alfons
Kahle Hans-Gert
Tröller Mirko
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