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Atmospheric effects resolved in coherent airborne GNSS reflectometry

Moreno, Mario and Semmling, Maximilian and Stienne, Georges and Dalil, Wafa and Hoque, Mohammed Mainul and Wickert, Jens and Reboul, Serge (2022) Atmospheric effects resolved in coherent airborne GNSS reflectometry. In: International Workshop on GNSS Ionosphere. International Workshop on GNSS Ionosphere, 26–28 Sep 2022, Neustrelitz.

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The advent of the Global Satellite Navigation Systems (GNSS) allowed the emergence of multiple satellites, airborne and terrestrial systems for remote sensing, and Earth observation. GNSS signals, designed for positioning and navigation, can be used to obtain characteristics of the Earth's surface once they get reflected. Recent studies have made use of GNSS Reflectometry as a tool for atmospheric sounding with promising results, broadening the spectrum for the use of the reflected GNSS signals. This study examines the occurrence of high-precision phase delay information for airborne reflectometry under the condition of various sea states in coastal waters. We fuse GNSS and ancillary data to resolve the tropospheric residual from the signal path change over the observed period. The experiment consisted of four flights performed with a gyrocopter in July 2019 along the coast between Calais and Boulogne-Sur-Mer, France. The processing comprises the integration of aircraft trajectory, GNSS satellites orbits, and geoid model for direct and reflected signal path difference modeling. Path predictions are used for GNSS-R data processing by means of a model-aided software receiver. The resulting reflected signal is passed through a retracking module to obtain the corrected Doppler shift and residual phase observable comparable with the tropospheric residual retrieved from ray-tracing modeling assuming a standard atmosphere. Initial results have shown promising performance at calm sea and grazing angles. Satellites with low elevations (E < 10°) reveal coherent observations that allow resolving tropospheric effects from GNSS-R airborne data.

Item URL in elib:https://elib.dlr.de/188814/
Document Type:Conference or Workshop Item (Other)
Title:Atmospheric effects resolved in coherent airborne GNSS reflectometry
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Moreno, Mariomario.moreno (at) dlr.deUNSPECIFIED
Semmling, MaximilianMaximilian.Semmling (at) dlr.deUNSPECIFIED
Stienne, Georgesgeorges.stienne (at) univ-littoral.frUNSPECIFIED
Dalil, Wafawafa.dalil.elv (at) eilco-ulco.frUNSPECIFIED
Hoque, Mohammed MainulMainul.Hoque (at) dlr.deUNSPECIFIED
Wickert, Jenswickert (at) gfz-potsdam.deUNSPECIFIED
Reboul, Sergeserge.reboul (at) univ-littoral.frUNSPECIFIED
Date:26 September 2022
Journal or Publication Title:International Workshop on GNSS Ionosphere
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:GNSS Reflectometry, sea state, Doppler spread, atmospheric effects.
Event Title:International Workshop on GNSS Ionosphere
Event Location:Neustrelitz
Event Type:Workshop
Event Dates:26–28 Sep 2022
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication, Navigation, Quantum Technology
DLR - Research area:Raumfahrt
DLR - Program:R KNQ - Communication, Navigation, Quantum Technology
DLR - Research theme (Project):R - Ionosphere
Location: Neustrelitz
Institutes and Institutions:Institute for Solar-Terrestrial Physics > Space Weather Observation
Deposited By: Moreno Bulla, Mario Andres
Deposited On:14 Oct 2022 12:16
Last Modified:14 Oct 2022 12:16

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