Preprints
https://doi.org/10.5194/amt-2021-101
https://doi.org/10.5194/amt-2021-101

  06 May 2021

06 May 2021

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

High temporal resolution wet delay gradients estimated from multi-GNSS and microwave radiometer observations

Tong Ning1 and Gunnar Elgered2 Tong Ning and Gunnar Elgered
  • 1Lantmäteriet (The Swedish Mapping, Cadastral and Land Registration Authority), SE-80182, Gävle, Sweden
  • 2Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, SE-43992 Onsala, Sweden

Abstract. We have used one year of multi-GNSS observations at the Onsala Space Observatory on the Swedish west coast to estimate the linear horizontal gradients in the wet propagation delay. The estimated gradients are compared to the corresponding ones from a microwave radiometer. We have investigated different temporal resolutions from 5 min to one day. Relative to the GPS-only solution and using an elevation cutoff angle of 10° and a temporal resolution of 5 min the improvement obtained for the solution using GPS, Glonass, and Galileo data is an increase in the correlation coefficient of 11 % for the east gradient and 20 % for the north gradient. Out of all the different GNSS solutions, the highest correlation is obtained for the east gradients and a resolution of 2 h, while the best agreement for the north gradients is obtained for 6 h. The choice of temporal resolution is a compromise between getting a high correlation and the possibility to detect rapid changes in the gradient. Due to the differences in geometry of the observations, gradients which happen suddenly, are either not captured at all or captured but with much less amplitude by the GNSS data. When a weak constraint is applied in the estimation of process, the GNSS data have an improved ability to track large gradients, however, at the cost of increased formal errors.

Tong Ning and Gunnar Elgered

Status: open (until 01 Jul 2021)

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Tong Ning and Gunnar Elgered

Tong Ning and Gunnar Elgered

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Short summary
We compared the GNSS-derived gradients to the ones obtained from a collocated WVR. Overall the multi-GNSS solutions show small but significant improvements with the WVR gradients. When estimating GNSS gradients the choice temporal resolution is a compromise between getting a high correlation and loosing track of rapid gradient variations. Weakening the constraint used when estimating the GNSS gradients helps to track short-lived gradients however at the cost of increased formal errors.