3D modeling of the tropospheric refractivity using a permanent GPS network.

Authors: Macias-Valadez, DanielCocard, MarcSanterre, Rock
Abstract: Tropospheric delay inherent to GPS signals negatively impacts positioning precision. However, it can also provide information about the state of the troposphere, which may be useful for several meteorological applications. With a permanent GPS network, and using the estimated slant wet delays (SWD) between receivers and satellites, it is possible to develop a 3D model of the wet refractivity within the network and, for this purpose, we propose to use a 3D Taylor’s series development. To test this approach, a permanent network of 43 GPS stations in Switzerland has been used to estimate the SWD and use these values as input data to the proposed model. Using this model, it is possible to estimate zenith wet delay (ZWD) for a random 3D location within the network. The resulting ZWD can then be used to correct tropospheric delays of any additional roving GPS receiver not being part of the network. The wet refractivity values obtained with the model were validated against meteorological data gathered at independent meteorological stations within Switzerland.
Document Type: Article de recherche
Issue Date: 1 December 2007
Open Access Date: Restricted access
Document version: VoR
Permalink: http://hdl.handle.net/20.500.11794/12413
This document was published in: Geomatica, Vol. 61, (4), 445-453 (2007)
Canadian Institute of Geomatics.
Collection:Articles publiés dans des revues avec comité de lecture

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