A regional tropospheric model for airborne GPS applications |
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| Authors: | Q Wang G Xu S Petrovic U Schaefer U Meyer T Xu |
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| Institution: | 1. School of Info-Physics and Geomatics Engineering, Central South University, 410083 Changsha, PR China;2. Helmholtz Centre Potsdam, German Research Centre for Geosciences (GFZ), 14473 Potsdam, Germany;3. Federal Agency for Cartography and Geodesy (BKG), 04105 Leipzig, Germany;4. Federal Institute for Geosciences and Natural Resources (BGR), 30655 Hannover, Germany;5. Xian Research Institute of Surveying and Mapping, 710054 Xian, PR China |
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| Abstract: | A regional tropospheric model can be constructed using surveys from GPS ground networks. Using this model the tropospheric delays of a kinematic station within the region can be interpolated. However, such a model is generally not suitable for an airborne platform high above the ground networks. In this paper, a method of constructing a regional tropospheric model for airborne GPS applications is described. First, the kinematic station in the air is projected onto the ground. Then the tropospheric delays at projected point are interpolated from those of the ground networks. Finally, the tropospheric delays at projected point are extended upward to the airborne platform using pressure and temperature gradients and humidity exponential function. For validation of this method, the data of airborne campaign carried out by BKG in cooperation with GFZ and BGR 2008 in the northern Alps are used. The results show that GPS kinematic positioning precision in height component can be improved using this method. |
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| Keywords: | Tropospheric model Kinematic positioning Regional GPS network Spatial interpolation |
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