Assessment of Parameters Describing the Signal Delay in the Neutral Atmosphere Derived from VGOS Observations
Paper in proceeding, 2023

We use the VGOS session VR2101 to assess parameters describing the signal delay in the neutral atmosphere. VGOS results are compared to corresponding results derived from co-located GNSS stations for all sites, and additionally to results from a ground-based microwave radiometer for the Onsala Space Observatory. For the first time all three independent techniques can be compared with the same high temporal resolution of 5 min. Zenith total delays from VGOS and GNSS reveal correlation coefficients larger than 0.9 for all but one of the participating sites. Corresponding offsets are between 1–8 mm and root mean square differences are between 4–14 mm. Horizontal gradients from VGOS and GNSS have correlation coefficients between 0.2–0.5 for the east components and 0.4–0.7 for the north components. Corresponding offsets are sub-millimeter, and root mean square differences are on the order of 0.5–2.2 mm. The comparisons for the Onsala site of VGOS and GNSS w.r.t. microwave radiometer show correlation coefficients larger than 0.96 for the zenith total delays with offsets on the order of 7–11 mm and root mean square differences of 9–12 mm. Horizontal gradients show correlation coefficients of about 0.2 for the east components and about 0.5 for the north components. The corresponding offsets are between 0.6–1.8 mm and the root mean square differences are 0.9–1.3 mm.

VGOS, GNSS, WVr, ZTD, gradients

Author

Rüdiger Haas

Chalmers, Space, Earth and Environment, Onsala Space Observatory

Jan Johansson

Chalmers, Space, Earth and Environment, Onsala Space Observatory

Gunnar Elgered

Chalmers, Space, Earth and Environment, Onsala Space Observatory

Periklis Diamantidis

Chalmers, Space, Earth and Environment, Onsala Space Observatory

Tobias Nilsson

The Swedish Mapping, Cadastral and Land Registration Authority

International VLBI Service for Geodesy and Astrometry 2022 General Meeting Proceedings

Vol. NASA/ CP–20220018789 248-252

12th IVS General Meeting
Helsinki, Finland,

Space Ties

Swedish National Space Board (166/16), 2017-01-01 -- 2020-12-31.

Driving Forces

Sustainable development

Subject Categories

Meteorology and Atmospheric Sciences

Earth and Related Environmental Sciences

Roots

Basic sciences

Infrastructure

Onsala Space Observatory

More information

Latest update

9/15/2023