摘要：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.
其他摘要：Signals of global navigation satellite systems (GNSS) are delayed by propagatingthrough the Earth’s electrically neutral atmosphere. This delay term plays animportant role in GNSS positioning and has been taken into account in highprecisiongeodetic applications. The neutrospheric delay can be subdivided into adry and a complementary wet component. The wet component amounts to typicallyless than 10% of the total neutrospheric delay and can be used to determine highresolutionatmospheric water vapour fields based on extended neutrosphericmodelling. The approach outlined in the present paper combines empiricalneutrospheric a priori model, site-specific neutrosphere parameters and residuals ofGNSS phase observations. Using so-called single-layer models, the derivedatmospheric water vapour fields are two-dimensionally reconstructed andvisualised. Applying this extended neutrospheric model to generate water vapourfields within a regional GNSS network, the results indicate that both the temporaland the spatial resolution of the determined water vapour fields are improved incomparison to the conventional neutrospheric modelling.
关键词：GNSS;Residuals;Neutrospheric Modelling;Atmospheric Water Vapour;Resíduos;Modelagem Neutrosférica;Vapor D’água Atmosférico
