Sensitivity of Delay Doppler Map in Spaceborne GNSS-R to Geophysical Variables of the Ocean
Global Navigation Satellite Systems reflectometry (GNSS-R) is a particular case of a multistatic radar in which the signals transmitted by navigation satellites are the signals of opportunity. These signals can be processed as a radar scatterometer, as a radar altimeter, or as an unfocused synthetic...
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ftdoajarticles:oai:doaj.org/article:896d29b09b6b499f9fea9d9a23ca5076 2023-05-15T18:18:43+02:00 Sensitivity of Delay Doppler Map in Spaceborne GNSS-R to Geophysical Variables of the Ocean Adriano Camps Hyuk Park 2022-01-01T00:00:00Z https://doi.org/10.1109/JSTARS.2022.3211876 https://doaj.org/article/896d29b09b6b499f9fea9d9a23ca5076 EN eng IEEE https://ieeexplore.ieee.org/document/9911632/ https://doaj.org/toc/2151-1535 2151-1535 doi:10.1109/JSTARS.2022.3211876 https://doaj.org/article/896d29b09b6b499f9fea9d9a23ca5076 IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol 15, Pp 8624-8631 (2022) Delay doppler map geophysical variables global navigation satellite systems reflectometry (GNSS-R) ocean sensitivity Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809 article 2022 ftdoajarticles https://doi.org/10.1109/JSTARS.2022.3211876 2022-12-30T23:28:03Z Global Navigation Satellite Systems reflectometry (GNSS-R) is a particular case of a multistatic radar in which the signals transmitted by navigation satellites are the signals of opportunity. These signals can be processed as a radar scatterometer, as a radar altimeter, or as an unfocused synthetic aperture radar. GNSS-R has shown its potential to infer numerous geophysical variables: over land soil moisture, vegetation height, detection of freeze-thaw state, etc., map sea ice extent and type…, and over the ocean wind speed and direction, significant wave height, altimetric measurements or even more recently NASA has released a marine plastics litter product, and some also claim that sea surface salinity (SSS) can be inferred. In addition, retrieval algorithms neglect some of the variations of the delay Doppler map (DDM) that are linked to the observation geometry, i.e., look angle with respect to the speed vectors of the transmitter and receiver. All these different effects impact the DDM peak value and its shape, and may affect the retrieval of geophysical parameters, and ultimately the data interpretation. In this study, the following factors impacting the DDM peak value are studied: the observation geometry, the sea surface temperature, and SSS, the 10 m height wind speed (U 10 ) and direction (WD), the presence of foam, the sea development state, the presence of swell, currents, rain, and the presence of oil slicks perturbing the sea surface roughness. This illustrates the complexity of the challenges presented when trying to retrieve some of these variables, the required corrections, and their accuracy. Article in Journal/Newspaper Sea ice Directory of Open Access Journals: DOAJ Articles IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 15 8624 8631 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Delay doppler map geophysical variables global navigation satellite systems reflectometry (GNSS-R) ocean sensitivity Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Delay doppler map geophysical variables global navigation satellite systems reflectometry (GNSS-R) ocean sensitivity Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809 Adriano Camps Hyuk Park Sensitivity of Delay Doppler Map in Spaceborne GNSS-R to Geophysical Variables of the Ocean |
topic_facet |
Delay doppler map geophysical variables global navigation satellite systems reflectometry (GNSS-R) ocean sensitivity Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809 |
description |
Global Navigation Satellite Systems reflectometry (GNSS-R) is a particular case of a multistatic radar in which the signals transmitted by navigation satellites are the signals of opportunity. These signals can be processed as a radar scatterometer, as a radar altimeter, or as an unfocused synthetic aperture radar. GNSS-R has shown its potential to infer numerous geophysical variables: over land soil moisture, vegetation height, detection of freeze-thaw state, etc., map sea ice extent and type…, and over the ocean wind speed and direction, significant wave height, altimetric measurements or even more recently NASA has released a marine plastics litter product, and some also claim that sea surface salinity (SSS) can be inferred. In addition, retrieval algorithms neglect some of the variations of the delay Doppler map (DDM) that are linked to the observation geometry, i.e., look angle with respect to the speed vectors of the transmitter and receiver. All these different effects impact the DDM peak value and its shape, and may affect the retrieval of geophysical parameters, and ultimately the data interpretation. In this study, the following factors impacting the DDM peak value are studied: the observation geometry, the sea surface temperature, and SSS, the 10 m height wind speed (U 10 ) and direction (WD), the presence of foam, the sea development state, the presence of swell, currents, rain, and the presence of oil slicks perturbing the sea surface roughness. This illustrates the complexity of the challenges presented when trying to retrieve some of these variables, the required corrections, and their accuracy. |
format |
Article in Journal/Newspaper |
author |
Adriano Camps Hyuk Park |
author_facet |
Adriano Camps Hyuk Park |
author_sort |
Adriano Camps |
title |
Sensitivity of Delay Doppler Map in Spaceborne GNSS-R to Geophysical Variables of the Ocean |
title_short |
Sensitivity of Delay Doppler Map in Spaceborne GNSS-R to Geophysical Variables of the Ocean |
title_full |
Sensitivity of Delay Doppler Map in Spaceborne GNSS-R to Geophysical Variables of the Ocean |
title_fullStr |
Sensitivity of Delay Doppler Map in Spaceborne GNSS-R to Geophysical Variables of the Ocean |
title_full_unstemmed |
Sensitivity of Delay Doppler Map in Spaceborne GNSS-R to Geophysical Variables of the Ocean |
title_sort |
sensitivity of delay doppler map in spaceborne gnss-r to geophysical variables of the ocean |
publisher |
IEEE |
publishDate |
2022 |
url |
https://doi.org/10.1109/JSTARS.2022.3211876 https://doaj.org/article/896d29b09b6b499f9fea9d9a23ca5076 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol 15, Pp 8624-8631 (2022) |
op_relation |
https://ieeexplore.ieee.org/document/9911632/ https://doaj.org/toc/2151-1535 2151-1535 doi:10.1109/JSTARS.2022.3211876 https://doaj.org/article/896d29b09b6b499f9fea9d9a23ca5076 |
op_doi |
https://doi.org/10.1109/JSTARS.2022.3211876 |
container_title |
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
container_volume |
15 |
container_start_page |
8624 |
op_container_end_page |
8631 |
_version_ |
1766195388099854336 |