Rationale of GNSS Reflected Delay-Doppler Map (DDM) Distortions Induced by Specular Point Inaccuracies

Recent Advances in Reflectometry using GNSS and other Signals of Opportunity.-- 11 pages, 12 figures, 3 tables

Detalles Bibliográficos
Autores: Grieco, Giuseppe, Stoffelen, Ad, Portabella, Marcos
Tipo de recurso: artículo
Fecha de publicación:2020
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/207640
Acceso en línea:http://hdl.handle.net/10261/207640
Access Level:acceso abierto
Palabra clave:Delay-Doppler map (DDM) distortions
Global navigation satellite system (GNSS)
Reflectometry
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spelling Rationale of GNSS Reflected Delay-Doppler Map (DDM) Distortions Induced by Specular Point InaccuraciesGrieco, GiuseppeStoffelen, AdPortabella, MarcosDelay-Doppler map (DDM) distortionsGlobal navigation satellite system (GNSS)ReflectometryRecent Advances in Reflectometry using GNSS and other Signals of Opportunity.-- 11 pages, 12 figures, 3 tablesGlobal navigation satellite system reflectometry (GNSS-R)-derived winds from the cyclone GNSS (CYGNSS) satellite constellation are expected to significantly improve weather forecasts in the tropical region. Delay-Doppler maps (DDMs) acquired by the TechDemosat-1 (TDS-1) GNSS-R satellite mission suffer from distortions that are highly correlated to on-board specular point estimation inaccuracies. Such distortions may affect wind retrievals, especially when multilook approaches aiming at exploiting the ambiguity-free area of the DDM are applied. This article demonstrates: that CYGNSS DDMs are also affected by such distortions; the rationale of DDM shape asymmetries induced by specular point location inaccuracies; and a simple strategy for reducing such induced distortions. Two different datasets have been used, consisting of both regular and raw intermediate frequency CYGNSS measurements. The results show that, similar to TDS-1, the CYGNSS DDM distortions are correlated to specular point location inaccuracies. Furthermore, such inaccuracies are significantly reduced if more accurate specular point related parameters are used to recompress the raw GNSS-R echo, highlighting some sampling issues that are common to both TDS-1 and CYGNSS missions. These results suggest that multilook wind retrieval approaches aiming at exploiting also the peripheral parts of the DDM may be seriously compromised by such distortions. The latter may be substantially reduced by oversampling the outcoming DDM and by a posteriori choosing the proper DDM subsample. For future upcoming GNSS-R missions, it is strongly recommended to store the raw data for eventual reprocessing in case of miscalibration or processing issues such as those shown in this articleThe work in this article has been carried out in the context of the European Agency for the Exploitation of Meteorological Satellites Fellowship Project GOODIE: GNSS-R Observation Operator Development and Impact EvaluationWith the funding support of the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000928-S), of the Spanish Research Agency (AEI)Institute of Electrical and Electronics EngineersAgencia Estatal de Investigación (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2020202020202020info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/207640reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://www.doi.org/10.1109/JSTARS.2019.2938327Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2076402026-05-22T06:33:51Z
dc.title.none.fl_str_mv Rationale of GNSS Reflected Delay-Doppler Map (DDM) Distortions Induced by Specular Point Inaccuracies
title Rationale of GNSS Reflected Delay-Doppler Map (DDM) Distortions Induced by Specular Point Inaccuracies
spellingShingle Rationale of GNSS Reflected Delay-Doppler Map (DDM) Distortions Induced by Specular Point Inaccuracies
Grieco, Giuseppe
Delay-Doppler map (DDM) distortions
Global navigation satellite system (GNSS)
Reflectometry
title_short Rationale of GNSS Reflected Delay-Doppler Map (DDM) Distortions Induced by Specular Point Inaccuracies
title_full Rationale of GNSS Reflected Delay-Doppler Map (DDM) Distortions Induced by Specular Point Inaccuracies
title_fullStr Rationale of GNSS Reflected Delay-Doppler Map (DDM) Distortions Induced by Specular Point Inaccuracies
title_full_unstemmed Rationale of GNSS Reflected Delay-Doppler Map (DDM) Distortions Induced by Specular Point Inaccuracies
title_sort Rationale of GNSS Reflected Delay-Doppler Map (DDM) Distortions Induced by Specular Point Inaccuracies
dc.creator.none.fl_str_mv Grieco, Giuseppe
Stoffelen, Ad
Portabella, Marcos
author Grieco, Giuseppe
author_facet Grieco, Giuseppe
Stoffelen, Ad
Portabella, Marcos
author_role author
author2 Stoffelen, Ad
Portabella, Marcos
author2_role author
author
dc.contributor.none.fl_str_mv Agencia Estatal de Investigación (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Delay-Doppler map (DDM) distortions
Global navigation satellite system (GNSS)
Reflectometry
topic Delay-Doppler map (DDM) distortions
Global navigation satellite system (GNSS)
Reflectometry
description Recent Advances in Reflectometry using GNSS and other Signals of Opportunity.-- 11 pages, 12 figures, 3 tables
publishDate 2020
dc.date.none.fl_str_mv 2020
2020
2020
2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/207640
url http://hdl.handle.net/10261/207640
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://www.doi.org/10.1109/JSTARS.2019.2938327
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Institute of Electrical and Electronics Engineers
publisher.none.fl_str_mv Institute of Electrical and Electronics Engineers
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869423203774889984
score 15,81155

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