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SAR Azimuth Cut-off to Estimate Wind Speed under High Wind Regimes

Journal of Geodesy and Geoinformation Science 2021年第1期4卷 30-37页

作者： Valeria CORCIONE Ferdinando NUNZIATA Marcos PORTABELLA Giuseppe GRIECO Xiaofeng YANG maurizio migliaccio Universitàdegli Studi di Napoli Parthenope Dipartimento di IngegneriaNaples 80133Italy The institute of Marine Sciences(ICM-CSIC) Barcelona 08003Spain Koninklijk Nederlands Meterologisch Instituut(KNMI) De Bilt 3731The Netherlands State Key Laboratory of Remote Sensing Science Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100101China

In this study,the azimuth cut-off method,typically used for SAR moderate wind speed estimation purposes,is analyzed under high wind ***,the importance of the pixel spacing,the size of the boxes selected for Synthetic Aperture Radar(SAR)image partitioning and the image texture in terms of homogeneities are discussed by considering their influence on the azimuth cut-off(λc)***,a quality control analysis of the reliability ofλc is carried out by evaluating the distance between the autocorrelation functions(ACF)and their correspondent *** analysis points out the importance of filtering out the unreliable and unfeasibleλc values in order to improve the wind speed *** quality control procedure is based on a x2 test,applied on a large Sentinel-1 A *** soundness of the test is verified by an increment in terms of correlation betweenλc estimations and wind speed *** approach is,then,applied under high wind regimes,i.e.,tropical cyclones.

关键词： SAR wind speed azimuth cut-off significant wave height

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Marine Target Detection Using Dual-polarimetric SAR Imagery

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Journal of Geodesy and Geoinformation Science 2021年第1期4卷 63-69页

作者： Tao ZHANG Armando MARINO Ferdinando NUNZIATA Domenico VELOTTO Weizeng SHAO Xiaofeng LI maurizio migliaccio Huilin XIONG Department of Electronic Engineering Tsinghua UniversityBeijing 100084China The University of Stirling Natural SciencesStirling FK94LAU.K. Universitàdegli Studi di Napoli Parthenope Napoli 38-80133Italy German Aerospace Center Bremen 28199Germany Colleage of Marine Sciences Shanghai Ocean UniversityShanghai 201306China Institute of Oceanology Chinese Academy of SciencesNanhai RoadQingdao 266071China School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

In this study,we provide a summary of research advances in the field of maritime target detection using DP(dualpolarimetric)SAR(Synthetic Aperture Radar)imagery,accomplished during the European and China collaboration in the framework of the Dragon-4 program ID *** main innovative contribution is twofold:(1)We addressed ship detection proposing an improved GP-PNF(Geometrical Perturbation-Polarimetric Notch Filter),termed as IGP-PNF,that is characterized by a new feature vector that includes three new scattering features;(2)We addressed oil platform detection by contrasting singlepolarization SAR methods with polarimetric ones in order to quantify the extra-benefit carried on polarimetric *** proposed theoretical framework is tested against actual multi-polarization SAR *** particular,ship detection methods are verified against a Sentinel-1 SAR scene where a large number of ships is present;while,oil platform detection is discussed using Terra SAR-X SAR *** analysis shows that:(1)The IGP-PNF method performs best in terms of clutter-to-target ratio;(2)Coherent polarimetric information significantly outperforms single-polarization SAR measurements in highlighting targets in challenging cases.

关键词： marine target detection dual-polarimetric SAR GP-PNF PCA Sentinel-1 TS-X

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