Impact of the elevation angle on CYGNSS GNSS-R bistatic reflectivity as a function of effective surface roughness over land surfaces

The Earth's surface bistatic reflectivity GLHCP,CyGNSS is experimentally characterized using the novel Global Navigation Satellite Systems Reflectometry (GNSS-R) L-band passive multistatic radar technique from the Cyclone Global Navigation Satellite Systems (CyGNSS) eight-microsatellite constel...

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Autores: Carreno-Luengo, H, Luzi, G, Crosetto, M
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2018
País:España
Institución:Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
Repositorio:r-CTTC. Repositorio Institucional Producción Científica del Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
OAI Identifier:oai:cttc.fundanetsuite.com:p1241
Acceso en línea:https://cttc.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=1241
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85057122740&doi=10.3390%2frs10111749&partnerID=40&md5=45c96f23a0e6ce8761f3878426be8d72
Access Level:acceso abierto
Palabra clave:Coherent scattering
Communication satellites
Correlation methods
Global positioning system
Incoherent scattering
Moisture determination
Multistatic radars
Reflection
Salinity measurement
Satellites
Soil moisture
Storms
Surface scattering
Bistatic
CyGNSS
Elevation angle
Global Navigation Satellite Systems
GNSS-R
Maximum correlation coefficient
Pearson correlation coefficients
Surface roughness parameters
Surface roughness
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spelling Impact of the elevation angle on CYGNSS GNSS-R bistatic reflectivity as a function of effective surface roughness over land surfacesCarreno-Luengo, HLuzi, GCrosetto, MCoherent scatteringCommunication satellitesCorrelation methodsGlobal positioning systemIncoherent scatteringMoisture determinationMultistatic radarsReflectionSalinity measurementSatellitesSoil moistureStormsSurface scatteringBistaticCyGNSSElevation angleGlobal Navigation Satellite SystemsGNSS-RMaximum correlation coefficientPearson correlation coefficientsSurface roughness parametersSurface roughnessThe Earth's surface bistatic reflectivity GLHCP,CyGNSS is experimentally characterized using the novel Global Navigation Satellite Systems Reflectometry (GNSS-R) L-band passive multistatic radar technique from the Cyclone Global Navigation Satellite Systems (CyGNSS) eight-microsatellite constellation. The focus of this study is to evaluate the influence of the GNSS satellites' elevation angle ?e on GLHCP,CyGNSS, as a function of soil moisture content (SMC) and effective surface roughness parameter h. As the average response, the change of the scattering regime at a global scale and considering also vegetated surfaces appears at ?e ˜ 55°. This empirical observation is understood as a change on the dominant scattering term, from incoherent to coherent. Then, the correlation of GLHCP,CyGNSS and SMC is evaluated as a function of ?e over specific sparsely vegetated target areas. The smoother the surface, the higher the angular variability of the Pearson correlation coefficients. Over croplands (e.g., Argentinian Pampas), an improved correlation coefficient is achieved over angular ranges where the coherent scattering regime becomes the dominant one. As such, this function depends on the surface roughness. The maximum correlation coefficients are found at different ?e for increasing mean roughness levels: rPampas ˜ 0.78 at ?e ˜ [60,70]°, rIndia ˜ 0.72 at ?e ˜ [50,60]°, and rSudan ˜ 0.74 at ?e ˜ [30,40]°. SMC retrieval algorithms based on GNSS-R multi-angular information could benefit from these findings, so as to improve the accuracy using single-polarized signals. © 2018 by the authors.MDPI Multidisciplinary Digital Publishing Institute2018info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttps://cttc.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=1241https://www.scopus.com/inward/record.uri?eid=2-s2.0-85057122740&doi=10.3390%2frs10111749&partnerID=40&md5=45c96f23a0e6ce8761f3878426be8d72Remote SensingISSN: 20724292reponame:r-CTTC. Repositorio Institucional Producción Científica del Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)instname:Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)Inglésinfo:eu-repo/semantics/openAccessoai:cttc.fundanetsuite.com:p12412026-06-17T11:44:47Z
dc.title.none.fl_str_mv Impact of the elevation angle on CYGNSS GNSS-R bistatic reflectivity as a function of effective surface roughness over land surfaces
title Impact of the elevation angle on CYGNSS GNSS-R bistatic reflectivity as a function of effective surface roughness over land surfaces
spellingShingle Impact of the elevation angle on CYGNSS GNSS-R bistatic reflectivity as a function of effective surface roughness over land surfaces
Carreno-Luengo, H
Coherent scattering
Communication satellites
Correlation methods
Global positioning system
Incoherent scattering
Moisture determination
Multistatic radars
Reflection
Salinity measurement
Satellites
Soil moisture
Storms
Surface scattering
Bistatic
CyGNSS
Elevation angle
Global Navigation Satellite Systems
GNSS-R
Maximum correlation coefficient
Pearson correlation coefficients
Surface roughness parameters
Surface roughness
title_short Impact of the elevation angle on CYGNSS GNSS-R bistatic reflectivity as a function of effective surface roughness over land surfaces
title_full Impact of the elevation angle on CYGNSS GNSS-R bistatic reflectivity as a function of effective surface roughness over land surfaces
title_fullStr Impact of the elevation angle on CYGNSS GNSS-R bistatic reflectivity as a function of effective surface roughness over land surfaces
title_full_unstemmed Impact of the elevation angle on CYGNSS GNSS-R bistatic reflectivity as a function of effective surface roughness over land surfaces
title_sort Impact of the elevation angle on CYGNSS GNSS-R bistatic reflectivity as a function of effective surface roughness over land surfaces
dc.creator.none.fl_str_mv Carreno-Luengo, H
Luzi, G
Crosetto, M
author Carreno-Luengo, H
author_facet Carreno-Luengo, H
Luzi, G
Crosetto, M
author_role author
author2 Luzi, G
Crosetto, M
author2_role author
author
dc.subject.none.fl_str_mv Coherent scattering
Communication satellites
Correlation methods
Global positioning system
Incoherent scattering
Moisture determination
Multistatic radars
Reflection
Salinity measurement
Satellites
Soil moisture
Storms
Surface scattering
Bistatic
CyGNSS
Elevation angle
Global Navigation Satellite Systems
GNSS-R
Maximum correlation coefficient
Pearson correlation coefficients
Surface roughness parameters
Surface roughness
topic Coherent scattering
Communication satellites
Correlation methods
Global positioning system
Incoherent scattering
Moisture determination
Multistatic radars
Reflection
Salinity measurement
Satellites
Soil moisture
Storms
Surface scattering
Bistatic
CyGNSS
Elevation angle
Global Navigation Satellite Systems
GNSS-R
Maximum correlation coefficient
Pearson correlation coefficients
Surface roughness parameters
Surface roughness
description The Earth's surface bistatic reflectivity GLHCP,CyGNSS is experimentally characterized using the novel Global Navigation Satellite Systems Reflectometry (GNSS-R) L-band passive multistatic radar technique from the Cyclone Global Navigation Satellite Systems (CyGNSS) eight-microsatellite constellation. The focus of this study is to evaluate the influence of the GNSS satellites' elevation angle ?e on GLHCP,CyGNSS, as a function of soil moisture content (SMC) and effective surface roughness parameter h. As the average response, the change of the scattering regime at a global scale and considering also vegetated surfaces appears at ?e ˜ 55°. This empirical observation is understood as a change on the dominant scattering term, from incoherent to coherent. Then, the correlation of GLHCP,CyGNSS and SMC is evaluated as a function of ?e over specific sparsely vegetated target areas. The smoother the surface, the higher the angular variability of the Pearson correlation coefficients. Over croplands (e.g., Argentinian Pampas), an improved correlation coefficient is achieved over angular ranges where the coherent scattering regime becomes the dominant one. As such, this function depends on the surface roughness. The maximum correlation coefficients are found at different ?e for increasing mean roughness levels: rPampas ˜ 0.78 at ?e ˜ [60,70]°, rIndia ˜ 0.72 at ?e ˜ [50,60]°, and rSudan ˜ 0.74 at ?e ˜ [30,40]°. SMC retrieval algorithms based on GNSS-R multi-angular information could benefit from these findings, so as to improve the accuracy using single-polarized signals. © 2018 by the authors.
publishDate 2018
dc.date.none.fl_str_mv 2018
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://cttc.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=1241
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85057122740&doi=10.3390%2frs10111749&partnerID=40&md5=45c96f23a0e6ce8761f3878426be8d72
url https://cttc.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=1241
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85057122740&doi=10.3390%2frs10111749&partnerID=40&md5=45c96f23a0e6ce8761f3878426be8d72
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv MDPI Multidisciplinary Digital Publishing Institute
publisher.none.fl_str_mv MDPI Multidisciplinary Digital Publishing Institute
dc.source.none.fl_str_mv Remote Sensing
ISSN: 20724292
reponame:r-CTTC. Repositorio Institucional Producción Científica del Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
instname:Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
instname_str Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
reponame_str r-CTTC. Repositorio Institucional Producción Científica del Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
collection r-CTTC. Repositorio Institucional Producción Científica del Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
repository.name.fl_str_mv
repository.mail.fl_str_mv
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