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An inter-comparative study of geodetic GNSS Reflectometry for sea Level monitoring with large tidal range

Authors

Tabibi,  Sajad
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Geremia-Nievinski,  Felipe
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Antonoglou,  Nikolaos
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Jihye Park,  Jihye
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Purnell,  Dave
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Wickert,  Jens
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Williams,  Simon D. P.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Tabibi, S., Geremia-Nievinski, F., Antonoglou, N., Jihye Park, J., Purnell, D., Wickert, J., Williams, S. D. P. (2023): An inter-comparative study of geodetic GNSS Reflectometry for sea Level monitoring with large tidal range, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4122


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021561
Abstract
Sajad Tabibi, Felipe Geremia-Nievinski, Nikolaos Antonoglou, Jihye Jihye Park, Dave Purnell, Jens Wickert & Simon D. P. Williams Oral published 2023 in IUGG 2023 The use of reflected radio signals at L-band broadcasted by GNSS for coastal sea level studies has gained popularity in recent years. The geodetic GNSS-R working group 4.3.7 of the IAG, with 21 members, aims to further establish the value of GNSS-R for various scientific communities, including geodesy, oceanography, cryosphere, and hydrology. As part of this effort, the first inter-comparison campaign on SNR-based GNSS-R for sea level monitoring was conducted between 2015 and 2019 by the JWG 4.3.9, using the Onsala GNSS-R tide gauge station. A second campaign, involving eight research groups, was launched in July 2020 to examine the effects of large tidal range and multi-GNSS revisit time on GNSS-R sea level retrievals. Data from two GNSS stations in the Netherlands and France (VLIS and ROTG) with varying tidal ranges and mean reflector heights were provided to all participating groups. Five groups submitted their solutions for a 1-year period at ROTG in 2015 and the first 274 days of 2020 at VLIS. Here, the solutions are compared to tide gauge records, which are located 2 meters from the GNSS antennas. The processing settings of the comparison are presented in Table 1. Table 1. Second inter-comparison processing settings VLIS ROTG Lat., Long. (deg) 51.44286, 3.59734 48.71844, -3.966566 Receiver LEICA GR50 TPS GB-1000 Antenna LEIAR25.R4 TPSPG_A1+GP Mean RH (m) 10 8.5 Tidal range (m) 5 9 Azimuth interval (deg.) 60-180 90-270 Elevation interval (deg.) 2.5-30 5-30 Sampling rate (Hz) 1 1 Tropospheric correction optional optional Distance to TG (m) 2 2