Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/169845
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Título: | Toward the Generation of a Wind Geophysical Model Function for Spaceborne GNSS-R |
Autor: | Lin, Wenming CSIC ORCID; Portabella, Marcos CSIC ORCID ; Foti, Giuseppe CSIC ORCID; Stoffelen, Ad; Gommenginger, Christine; He, Yijun | Fecha de publicación: | feb-2019 | Editor: | Institute of Electrical and Electronics Engineers | Citación: | IEEE Transactions on Geoscience and Remote Sensing 57(2): 655-666 (2019) | Resumen: | This paper presents a comprehensive procedure to improve the wind geophysical model function (GMF) for the Global Navigation Satellite System Reflectometry (GNSS-R) instrument onboard the TechDemoSat-1 satellite. The observable used to define the GMF is extracted from the measured delay-Doppler maps (DDMs) by correcting for the nongeophysical effects within the measurements. Besides the instrument and the geometric effects as provided in the bistatic radar equation, a calibration term that accounts for the uncalibrated receiver antenna gain and the unknown transmitter antenna gain is proposed to optimize the calculation of GNSS-R observables. Such calibration term is presented as a function of observing elevation and azimuth angles and is shown to remarkably reduce the measurement uncertainties. First, an empirical wind-only GMF is developed using the collocated Advanced Scatterometer (ASCAT) winds and European Centre for Medium-Range Weather Forecasts (ECMWF) model wind output. This empirical GMF agrees well with the model output. Then, the sensitivity of the observable to waves is analyzed using the collocated ECMWF wave parameters. The results show that it is difficult to include mean square slope (MSS) in the development of an empirical GMF, since the difference between ECMWF MSS and the MSS sensed by GNSS-R varies with incidence angle and wind speed. However, it is relevant to take significant wave height (Hs) in account, particularly for low wind conditions. Consequently, a wind/Hs approach is proposed for improved wind retrievals | Descripción: | 12 pages, 12 figures, 1 table.-- © 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. | Versión del editor: | https://doi.org/10.1109/TGRS.2018.2859191 | URI: | http://hdl.handle.net/10261/169845 | DOI: | 10.1109/TGRS.2018.2859191 | Identificadores: | issn: 0196-2892 |
Aparece en las colecciones: | (ICM) Artículos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
---|---|---|---|---|
Lin_et_al_2019_postprint.pdf | 1,17 MB | Adobe PDF | Visualizar/Abrir |
CORE Recommender
SCOPUSTM
Citations
17
checked on 17-mar-2024
WEB OF SCIENCETM
Citations
16
checked on 22-feb-2024
Page view(s)
368
checked on 19-mar-2024
Download(s)
430
checked on 19-mar-2024
Google ScholarTM
Check
Altmetric
Altmetric
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.