![]() ![]() We question the popular elevation-dependent weighting function and introduce an alternative one. First, we identify a so-called common strategy, which combines processing parameters that are identified to be the most popular among published papers on the topic. Therefore, we discuss these shortcomings in detail and present a comprehensive analysis of the sensitivity of real-time ZTD on processing parameters. However, neither are these achievements combined in a single processing strategy, nor is the impact of other processing parameters on ZTD accuracy analyzed. Millimeter-level improvements are noticed due to GPS ambiguity resolution, gradient estimation, or multi-GNSS processing. ![]() The reported accuracy of the real-time zenith total delay (ZTD) has not improved significantly over time and usually remains at the level of 5–18 mm, depending on the station and test period studied. Real-time GNSS meteorology has been possible since 2013, when the International GNSS Service (IGS) established its real-time service. Global navigation satellite system (GNSS) remote sensing of the troposphere, called GNSS meteorology, is already a well-established tool in post-processing applications. ![]()
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