Influence of tropospheric zenith delays obtained by GPS and VLBI on station heights
作者： J. Böhm , H. Schuh , R. Weber
DOI: 10.1007/978-3-662-04683-8_21
关键词: Global Positioning System 、 Zenith 、 Very-long-baseline interferometry 、 Troposphere 、 Geodesy 、 Environmental science 、 Refraction 、 Path delay 、 Elevation angle
摘要: The least-squares fit of VLBI data analysis reveals a high correlation between station height parameters and tropospheric zenith path delay parameters. Thus, the heights estimated by solution are severely affected if refraction is modeled insufficiently or there lack observations at low elevations. Starting from this consideration, two different measures in were tested to investigate their impact on estimation heights. Firstly, external delays IGS (International GPS Service) entered constrained analysis, secondly, cutoff elevation angle was reduced 10° 7°.Both strategies, applied analyses all NEOS-A experiments 1999, improved repeatability Wettzell (Germany) Fortaleza (Brazil).
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