Preprints
https://doi.org/10.5194/amt-2021-87
https://doi.org/10.5194/amt-2021-87

  25 May 2021

25 May 2021

Review status: this preprint is currently under review for the journal AMT.

Validation of tropospheric ties at the test setup GNSS co-location site Potsdam

Chaiyaporn Kitpracha1,2, Robert Heinkelmann2, Markus Ramatschi2, Kyriakos Balidakis2, Benjamin Männel2, and Harald Schuh1,2 Chaiyaporn Kitpracha et al.
  • 1Technische Universität Berlin, Chair of Satellite Geodesy, Kaiserin-Augusta-Allee 104-106, 10553 Berlin, Germany
  • 2GFZ German Research Centre for Geosciences, Space Geodetic Techniques, Telegrafenberg, 14473 Potsdam, Germany

Abstract. Atmospheric ties are theoretically affected by the height differences between antennas at the same site and the meteorological conditions. However, there is often a discrepancy between the expected zenith delay differences and those estimated from geodetic analysis, potentially degrading a combined solution employing atmospheric ties. In order to investigate the possible effects on GNSS atmospheric delay, this study set up an experiment of four co-located GNSS stations of the same type, both antenna and receiver. Specific height differences for each antenna w.r.t the reference antenna are given. One antenna was equipped with a radome at the same height and type as a antenna close to the ground. In addition, a meteorological sensor was used for meteorological data recording. The results show that tropospheric ties from the analytical equation based on meteorological data from GPT3, Numerical Weather Model, and in-situ measurements, and ray-traced tropospheric ties, reduced the bias of zenith delay roughly by 72 %. However, the in-situ tropospheric ties yield the best precision in this study. These results demonstrate, that the instrument effects on GNSS zenith delays were mitigated by using the same instrument. In contrast, the radome causes unexpected bias of GNSS zenith delays in this study. Additionally, multipath effects at low-elevation observations degraded the tropospheric east gradients.

Chaiyaporn Kitpracha et al.

Status: open (until 20 Jul 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Chaiyaporn Kitpracha et al.

Chaiyaporn Kitpracha et al.

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Short summary
In this study, we expected to learn what are the potential effects of GNSS atmospheric delays from this unique experiment. The results show that the instrument effects on GNSS zenith delays were mitigated by using the same instrument. The radome causes unexpected bias of GNSS zenith delays in this study. Additionally, multipath effects at low-elevation observations degraded the tropospheric east gradients.