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

SND-ID: 2021-219-1. Version: 1. DOI: https://doi.org/10.5878/fyt8-bs80

Citation

Creator/Principal investigator(s)

Gunnar Elgered - Chalmers University of Technology, Space, Earth and Environmental Science orcid

Tong Ning - The Swedish Mapping, Cadastral and Land Registration Authority

Research principal

Chalmers University of Technology - Space, Earth and Environmental Science rorId

Description

Abstract of the published paper using the dataset:
We have used one year (2019) 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, gradie

... Show more..
Abstract of the published paper using the dataset:
We have used one year (2019) 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. Show less..

Data contains personal data

No

Language

Method and outcome

Time period(s) investigated

2019-01-01 – 2019-12-31

Data format / data structure

Data collection
  • Instrument: Global Navigational Satellite Systems
  • Temporal resolution: 5 minute
Geographic coverage

Geographic spread

Geographic location: Onsala Parish

Geographic description: The atmosphere above the Onsala Space Observatory

Administrative information

Responsible department/unit

Space, Earth and Environmental Science

Topic and keywords

Research area

Earth and related environmental sciences (Standard för svensk indelning av forskningsämnen 2011)

Meteorology and atmospheric sciences (Standard för svensk indelning av forskningsämnen 2011)

Climatology / meteorology / atmosphere (INSPIRE topic categories)

Publications

Ning T. and Elgered, G, (2021). High temporal resolution wet delay gradients estimated from multi-GNSS and microwave radiometer observations, Atmospheric Measurement Techniques.

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Published: 2021-07-21