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Sea state-dependent Doppler spread as a limit of coherent GNSS reflectometry from an airborne platform

Moreno, Mario und Semmling, Maximilian und Stienne, Georges und Dalil, Wafa und Hoque, Mohammed Mainul und Wickert, Jens und Reboul, Serge (2022) Sea state-dependent Doppler spread as a limit of coherent GNSS reflectometry from an airborne platform. In: ESA Living Planet Symposium 2022. ESA Living Planet Symposium 2022, 2022-05-23 - 2022-05-27, Bonn.

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Kurzfassung

Sea level rise and sea state variability due to climate change and global warming are major research topics in the scientific community. Ocean weather conditions considerably impact coastal areas, and wind speed (WS) and significant wave height (SWH) are usable parameters to monitor the sea state threats on the coasts. GNSS reflectometry (GNSS-R) has shown considerable promise as a remote sensing technique for ocean parameters estimation. Multiple studies have been conducted successfully in the recent two decades by using GNSS-R ground-based, airborne and spaceborne data to retrieve geophysical properties of the ocean surface. The focus of this study is to investigate the Doppler shift of the reflected signal as observable to estimate the Doppler spread (DS) and determine its correlation with sea state changes employing GNSS-R airborne data in coastal areas. An additional aim is to study the possibility of using the Doppler spread as a metric for coherent GNSS reflectometry for applications such as precise altimetry and precise total electron content (TEC) estimates. An experiment was conducted from the 12th to the 19th of July 2019 along Opal Coast, between the cities of Calais and Boulogne-sur-Mer, France. The experiment consisted of multiple flights at an altitude of ~780m (a.m.s.l), and the direct and reflected signals were received by dual-polarized (Right-Handed and Left-Handed Circular Polarizations) antenna mounted on a gyrocopter. A software receiver is used to process the direct and reflected signals from the right-hand channel. The resulting in-phase (I) and quadrature (Q) components (at 50 Hz rate) of the reflected signals are analyzed in the spectral domain every ten seconds to obtain the relative Doppler shift and power estimates. The coherence is established by analyzing the phase observations obtained from I and Q. The sensitivity of the reflected signal parameters and the sea state is determined by the correlation between the Doppler Spread with wind speed and significant wave height. The latter two were obtained from the atmospheric, land and oceanic climate model, ERA5, provided by the European Centre for Medium-Range Weather Forecasts (ECMWF). Initial results have shown promising performance at a calm sea (WS: 2.9 m/s and SWH: 0.26 m) and grazing angles. Satellites with low elevations (E < 10°) present a Doppler Spread of 0.3 Hz and its Pearson correlations with respect to WS and SHW are 0.89 and 0.75, respectively. The performance is relatively poor for high-elevation events (E > 30°). The DS increases up to 2.1 Hz and the correlation decrease to 0.55 and 0.42 respectively. Coherence conditions are still under study; however, preliminary phase analysis reveals coherent observations at events with elevations below 15° and sea state with a significant wave height of 0.26 m.

elib-URL des Eintrags:https://elib.dlr.de/188812/
Dokumentart:Konferenzbeitrag (Poster)
Titel:Sea state-dependent Doppler spread as a limit of coherent GNSS reflectometry from an airborne platform
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Moreno, Mariomario.moreno (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Semmling, MaximilianMaximilian.Semmling (at) dlr.dehttps://orcid.org/0000-0002-5228-8072NICHT SPEZIFIZIERT
Stienne, Georgesgeorges.stienne (at) univ-littoral.frNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Dalil, Wafawafa.dalil.elv (at) eilco-ulco.frNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Hoque, Mohammed MainulMainul.Hoque (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Wickert, Jenswickert (at) gfz-potsdam.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Reboul, Sergeserge.reboul (at) univ-littoral.frNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:23 Mai 2022
Erschienen in:ESA Living Planet Symposium 2022
Referierte Publikation:Nein
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:GNSS Reflectometry, sea state, Doppler spreading.
Veranstaltungstitel:ESA Living Planet Symposium 2022
Veranstaltungsort:Bonn
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:23 Mai 2022
Veranstaltungsende:27 Mai 2022
Veranstalter :ESA
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Kommunikation, Navigation, Quantentechnologien
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R KNQ - Kommunikation, Navigation, Quantentechnologie
DLR - Teilgebiet (Projekt, Vorhaben):R - Ionosphäre
Standort: Neustrelitz
Institute & Einrichtungen:Institut für Solar-Terrestrische Physik > Weltraumwetterbeobachtung
Hinterlegt von: Moreno Bulla, Mario Andres
Hinterlegt am:14 Okt 2022 12:15
Letzte Änderung:24 Apr 2024 20:50

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