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A comprehensive comparison of atmospheric mapping functions for GPS measurements in Egypt by S. A. Younes; A. G. Elmezayen is a Earth and Planetary Sciences article available to read on EtoBox.

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## Abstract The principal limiting error source in the Global Positioning System (GPS) is the mismodeling of the delay experienced by radio waves in propagating through the atmosphere. The atmosphere causing the delay in GPS signals consists of two main layers: the ionosphere and the troposphere. The ionospheric delay can be mitigated using dual frequency receivers, but the tropospheric delay is often corrected using a standard tropospheric model. The tropospheric delay can be described as a product of the delay at the zenith and a mapping function, which models the elevation dependence of the propagation delay. A large number of mapping functions have been developed for use in the analysis of space geodetic data. An assessment of most of these mapping functions including those developed by Niell (NMF), Herring (MTT), Davis (CfA-2.2), Ifadis, Chao, Black & Eisner (B & E), Yang & Ping, Moffett, Vienna (VMF), and Isobaric (IMF) have been performed. The behavior of these mapping functions was assessed by comparing their results with highly accurate Numerical Integration based Models (NIM) for three different stations in Egypt (Aswan, Helwan, and Mersa Matrouh) at different times throu

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Author

S. A. Younes; A. G. Elmezayen

Publisher

De Gruyter Open Sp. z o.o. ; Walter de Gruyter GmbH (ISSN 2081-9919)

Published

2012

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)