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Development of polarization ratio model for sea surface wind field retrieval from TerraSAR-X HH polarization data

Shao, Weizeng and Li, Xiao-Ming and Lehner, Susanne and Guan, Changlong (2014) Development of polarization ratio model for sea surface wind field retrieval from TerraSAR-X HH polarization data. International Journal of Remote Sensing, 35 (11-12), pp. 4046-4063. Taylor & Francis. doi: 10.1080/01431161.2014.916059. ISSN 0143-1161.

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Official URL: http://dx.doi.org/10.1080/01431161.2014.916059

Abstract

In this article, the polarization ratio (PR) of TerraSAR-X (TS-X) vertical–vertical (VV) and horizontal–horizontal (HH) polarization data acquired over the ocean is investigated. Similar to the PR of C-band synthetic aperture radar (SAR), the PR of X-band SAR data also shows significant dependence on incidence angle. The normalized radar cross-section (NRCS) in VV polarization data is generally larger than that in HH polarization for incidence angles above 23°. Based on the analysis, two PR models proposed for C-band SAR were retuned using TS-X dual-polarization data. A new PR model, called X-PR hereafter, is proposed as well to convert the NRCS of TS-X in HH polarization to that in VV polarization. By using the developed geophysical model functions of XMOD1 and XMOD2 and the tuned PR models, the sea surface field is retrieved from the TS-X data in HH polarization. The comparisons with in situ buoy measurements show that the combination of XMOD2 and X-PR models yields a good retrieval with a root mean square error (RMSE) of 2.03 m s–1 and scatter index (SI) of 22.4%. A further comparison with a high-resolution analysis wind model in the North Sea is also presented, which shows better agreement with RMSE of 1.76 m s–1 and SI of 20.3%. We also find that the difference between the fitting of the X-PR model and the PR derived from TS-X dual-polarization data is close to a constant. By adding the constant to the X-PR model, the accuracy of HH polarization sea surface wind speed is further improved with the bias reduced by 0.3 m s–1. A case acquired at the offshore wind farm in the East China Sea further demonstrates that the improvement tends to be more effective for incidence angles above 40°.

Item URL in elib:https://elib.dlr.de/89548/
Document Type:Article
Title:Development of polarization ratio model for sea surface wind field retrieval from TerraSAR-X HH polarization data
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Shao, WeizengDLR and Marine Science and Technology College, Zhejiang OceanUniversity, 316000 Zhoushan, ChinaUNSPECIFIED
Li, Xiao-MingXiao.Li (at) dlr.deUNSPECIFIED
Lehner, SusanneSusanne.Lehner (at) dlr.deUNSPECIFIED
Guan, ChanglongCollege of physical and environmental oceanography, OceanUniversity of China, 266003 Qingdao, ChinaUNSPECIFIED
Date:2 June 2014
Journal or Publication Title:International Journal of Remote Sensing
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:35
DOI :10.1080/01431161.2014.916059
Page Range:pp. 4046-4063
Editors:
EditorsEmailEditor's ORCID iD
Warner, Timothy A.West Virginia University, USAUNSPECIFIED
Publisher:Taylor & Francis
ISSN:0143-1161
Status:Published
Keywords:TerraSAR-X, X-band Synthetic Aperture Radar, dual-polarization, sea surface wind
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Vorhaben Entwicklung und Erprobung von Verfahren zur Gewässerfernerkundung (old)
Location: Bremen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Kaps, Ruth
Deposited On:10 Sep 2014 12:23
Last Modified:30 Jan 2015 10:56

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