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Remote Sensing of Precipitation Using Reflected GNSS Signals: Response Analysis of Polarimetric Observations

Asgarimehr, Milad and Hoseini, Mostafa and Semmling, Maximilian and Ramatschi, Markus and Camps, Adriano and Nahavandchi, Hossein and Haas, Rüdiger and Wickert, Jens (2021) Remote Sensing of Precipitation Using Reflected GNSS Signals: Response Analysis of Polarimetric Observations. IEEE Transactions on Geoscience and Remote Sensing. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/TGRS.2021.3062492. ISSN 0196-2892. (In Press)

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Official URL: https://ieeexplore.ieee.org/document/9380743

Abstract

For the first time, rain effects on the polarimetric observations of the global navigation satellite system reflectometry (GNSS-R) are investigated. The physical feasibility of tracking the modifications in the surface roughness by rain splash and the surface salinity by the accumulation of freshwater is theoretically discussed. An empirical analysis is carried out using measurements of a coastal GNSS-R station with two side-looking antennas in right- and left-handed circular polarizations (RHCP and LHCP). Discernible drops in RHCP and LHCP powers are observed during rain over a calm sea. The power drop becomes larger at higher elevation angles. The average LHCP power drops by ~ 5 dB at an elevation angle of 45°. The amplitude of the correlation sum shows a dampening, responding to rain rate systematically. The LHCP observations show higher sensitivity to rainfall compared to RHCP observations. The retrieved standard deviation of surface heights shows a steady increase with the rain rate. The derived surface salinity shows a decrease at rains higher than 10 mm/h. This study confirms the potential under environmental conditions of the GNSS-R ground-based station, e.g., with salinity mostly lower than 30 psu, over a calm sea, being a starting point for future investigations.

Item URL in elib:https://elib.dlr.de/141442/
Document Type:Article
Title:Remote Sensing of Precipitation Using Reflected GNSS Signals: Response Analysis of Polarimetric Observations
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Asgarimehr, Miladmilad.asgarimehr (at) gfz-potsdam.deUNSPECIFIED
Hoseini, MostafaNorwegian University of Science and Technology NTNU, Trondheim, NorwayUNSPECIFIED
Semmling, MaximilianMaximilian.Semmling (at) dlr.dehttps://orcid.org/0000-0002-5228-8072
Ramatschi, Markusmaram (at) gfz-potsdam.deUNSPECIFIED
Camps, AdrianoUniversitat Politècnica de CatalunyaUNSPECIFIED
Nahavandchi, HosseinNorwegian University of Science and Technology NTNU, TrondheimUNSPECIFIED
Haas, RüdigerChalmers University of Technology, Gothenburg, SwedenUNSPECIFIED
Wickert, JensGeoForschungsZentrum Potsdamhttps://orcid.org/0000-0002-7379-5276
Date:2021
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI:10.1109/TGRS.2021.3062492
Publisher:IEEE - Institute of Electrical and Electronics Engineers
ISSN:0196-2892
Status:In Press
Keywords:GNSS-reflectometry (GNSS-R), polarimetric observations, rain, sea surface salinity (SSS), surface-roughening
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:16 Aug 2021 14:35
Last Modified:16 Aug 2021 14:35

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