EXTENDED NEUTROSPHERIC MODELLING FOR THE GNSS-BASED DETERMINATION OF HIGH-RESOLUTION ATMOSPHERIC WATER VAPOUR FIELDS

Xiaoguang Luo, Michael Mayer, H.C. Bernhard Heck

Abstract


Signals of global navigation satellite systems (GNSS) are delayed by propagating
through the Earth’s electrically neutral atmosphere. This delay term plays an
important role in GNSS positioning and has been taken into account in highprecision
geodetic applications. The neutrospheric delay can be subdivided into a
dry and a complementary wet component. The wet component amounts to typically
less than 10% of the total neutrospheric delay and can be used to determine highresolution
atmospheric water vapour fields based on extended neutrospheric
modelling. The approach outlined in the present paper combines empirical
neutrospheric a priori model, site-specific neutrosphere parameters and residuals of
GNSS phase observations. Using so-called single-layer models, the derived
atmospheric water vapour fields are two-dimensionally reconstructed and
visualised. Applying this extended neutrospheric model to generate water vapour
fields within a regional GNSS network, the results indicate that both the temporal
and the spatial resolution of the determined water vapour fields are improved in
comparison to the conventional neutrospheric modelling.

Keywords


GNSS; Residuals; Neutrospheric Modelling; Atmospheric Water Vapour; Resíduos; Modelagem Neutrosférica; Vapor D’água Atmosférico



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