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On the Response of Polarimetric GNSS-Reflectometry to Sea Surface Roughness

Hoseini, Mostafa and Semmling, Maximilian and Nahavandchi, Hossein and Rennspiess, Erik and Ramatschi, Markus and Haas, Rüdiger and Strandberg, Joakim and Wickert, Jens (2020) On the Response of Polarimetric GNSS-Reflectometry to Sea Surface Roughness. IEEE Transactions on Geoscience and Remote Sensing. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/TGRS.2020.3031396. ISSN 0196-2892.

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Reflectometry of Global Navigation Satellite Systems (GNSS) signals from the ocean surface has provided a new source of observations to study the ocean-atmosphere interactions. We investigate the sensitivity and performance of the GNSS-Reflectometry (GNSS-R) data to retrieve sea surface roughness (SSR) as an indicator of the sea state. A data set of one-year observations in 2016 is acquired from a coastal GNSS-R experiment in Onsala, Sweden. The experiment exploitstwo sea-looking antennas with right- and left-hand circular polarizations (RHCP and LHCP). The interference of the direct and reflected signals captured by the antennas is used by a GNSS-R receiver to generate complex interferometric fringes. We process the interferometric observations to estimate the contributions of direct signals and reflections to the total power. The power estimates are inverted to the SSR using the state-of-the-art model. The roughness measurements from the RHCP and LHCP links are evaluated against match-up wind measurements obtained from the nearest meteorological station. The results report on successful roughness retrieval with overall correlations of 0.76 for both links. However, the roughness effect in LHCP observations is more pronounced. The influence of surrounding complex coastlines and the wind direction dependence are discussed. The analysis reveals that the winds blowing from land have minimal impact on the roughness due to limited fetch. A clear improvement of roughness estimates with an overall correlation of 0.82 is observed for combined polarimetric observations from the RHCP and LHCP links. The combined observations can also improve the sensitivity of GNSS-R measurements to the change of sea state.

Item URL in elib:https://elib.dlr.de/137018/
Document Type:Article
Title:On the Response of Polarimetric GNSS-Reflectometry to Sea Surface Roughness
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Hoseini, MostafaNorwegian University of Science and Technology NTNU, Trondheim, NorwayUNSPECIFIEDUNSPECIFIED
Semmling, MaximilianUNSPECIFIEDhttps://orcid.org/0000-0002-5228-8072UNSPECIFIED
Nahavandchi, HosseinNorwegian University of Science and Technology NTNU, TrondheimUNSPECIFIEDUNSPECIFIED
Rennspiess, ErikGerman Research Centre for Geosciences GFZ, Potsdam, GermanyUNSPECIFIEDUNSPECIFIED
Haas, RüdigerChalmers University of Technology, Gothenburg, SwedenUNSPECIFIEDUNSPECIFIED
Strandberg, JoakimChalmers University of Technology, Gothenburg, SwedenUNSPECIFIEDUNSPECIFIED
Wickert, JensGeoForschungsZentrum Potsdamhttps://orcid.org/0000-0002-7379-5276UNSPECIFIED
Date:2 November 2020
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Keywords:Global Navigation Satellite Systems (GNSS)-Reflectometry, polarimetric observations, sea state, sea surface roughness
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication and Navigation
DLR - Research area:Raumfahrt
DLR - Program:R KN - Kommunikation und Navigation
DLR - Research theme (Project):R - Vorhaben Ionosphäre (old)
Location: Neustrelitz
Institutes and Institutions:Institute for Solar-Terrestrial Physics > Space Weather Observation
Deposited By: Semmling, Dr. Maximilian
Deposited On:09 Nov 2020 09:06
Last Modified:20 Oct 2023 09:08

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