Grazing-angle GNSS-R for the Determination of Tropospheric Delay and Water Vapor Content

Yang Wang

Abstract: The atmospheric water vapor contributes to ~60% of the atmospheric greenhouse effect under clear sky and is important to climate and weather modeling. The atmospheric water vapor is usually measured as vertically integrated water vapor (IWV), and it has been difficult to measure especially over polar ice and ocean. This paper presents a pilot study to use the dual-frequency GPS signals reflected off sea ice and collected by Spire Global CubeSats at grazing angles to estimate the troposphere delay and further retrieve the IWV. Results from two closely located reflection tracks are presented and compared to the ERA5 products. The GNSS-R results show good consistency with ERA5 and higher precision. The methodology and limitations of this proposed novel approach are also presented in this paper.
Published in: Proceedings of the 36th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2023)
September 11 - 15, 2023
Hyatt Regency Denver
Denver, Colorado
Pages: 3227 - 3232
Cite this article: Wang, Yang, "Grazing-angle GNSS-R for the Determination of Tropospheric Delay and Water Vapor Content," Proceedings of the 36th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2023), Denver, Colorado, September 2023, pp. 3227-3232. https://doi.org/10.33012/2023.19265
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