The Experts below are selected from a list of 17919 Experts worldwide ranked by ideXlab platform
Oscar Garciapineda - One of the best experts on this subject based on the ideXlab platform.
-
compact polarimetric synthetic aperture radar for marine Oil Platform and slick detection
IEEE Transactions on Geoscience and Remote Sensing, 2017Co-Authors: Biao Zhang, William Perrie, Xiaofeng Li, Oscar GarciapinedaAbstract:Compact polarimetric (CP) synthetic aperture radar (SAR) can provide ocean surface observations with large-coverage swath and abundant polarimetric scattering information. These distinctive characteristics make CP SAR a potential tool for operational monitoring Oil slicks and Oil Platforms, overcoming the shortcomings of small spatial coverage by the traditional quad-polarization (quad-pol) SAR. In this paper, we use the RADARSAT-2 C-band quad-pol SAR data to generate CP covariance matrix elements and subsequently construct pseudoquad-pol backscatter coefficients, using two CP reconstruction algorithms to evaluate CP SAR’s applications in detection of Oil slicks and Oil Platforms. The reconstructed co- and cross-polarization data show good agreement with original radar observations acquired at different incidence angles and wind speeds. Furthermore, we develop an unsupervised classification method using the relative phase, a logical scalar threshold that separates odd and multiple scattering events, as an indicator to discriminate Oil slicks and Platforms from clean ocean waters. The relative phase is positive for clean ocean surfaces where odd scattering is dominant, but negative for Oil Platforms and Oil slick-covered areas associated with multiple scattering. The detections of Oil spills and Oil Platforms are validated against known Oil Platform geographic positions and optical aircraft surveys of the Oil slicks. The proposed method provides a promising technique to detect Oil slicks and Oil Platforms from CP imaging mode SAR data, i.e., as may be acquired by the RISAT-1, ALOS-2, and the future RADARSAT Constellation Mission.
Biao Zhang - One of the best experts on this subject based on the ideXlab platform.
-
compact polarimetric synthetic aperture radar for marine Oil Platform and slick detection
IEEE Transactions on Geoscience and Remote Sensing, 2017Co-Authors: Biao Zhang, William Perrie, Xiaofeng Li, Oscar GarciapinedaAbstract:Compact polarimetric (CP) synthetic aperture radar (SAR) can provide ocean surface observations with large-coverage swath and abundant polarimetric scattering information. These distinctive characteristics make CP SAR a potential tool for operational monitoring Oil slicks and Oil Platforms, overcoming the shortcomings of small spatial coverage by the traditional quad-polarization (quad-pol) SAR. In this paper, we use the RADARSAT-2 C-band quad-pol SAR data to generate CP covariance matrix elements and subsequently construct pseudoquad-pol backscatter coefficients, using two CP reconstruction algorithms to evaluate CP SAR’s applications in detection of Oil slicks and Oil Platforms. The reconstructed co- and cross-polarization data show good agreement with original radar observations acquired at different incidence angles and wind speeds. Furthermore, we develop an unsupervised classification method using the relative phase, a logical scalar threshold that separates odd and multiple scattering events, as an indicator to discriminate Oil slicks and Platforms from clean ocean waters. The relative phase is positive for clean ocean surfaces where odd scattering is dominant, but negative for Oil Platforms and Oil slick-covered areas associated with multiple scattering. The detections of Oil spills and Oil Platforms are validated against known Oil Platform geographic positions and optical aircraft surveys of the Oil slicks. The proposed method provides a promising technique to detect Oil slicks and Oil Platforms from CP imaging mode SAR data, i.e., as may be acquired by the RISAT-1, ALOS-2, and the future RADARSAT Constellation Mission.
-
IGARSS - Oil Platform detection by compact polarimetric synthetic aperture radar
2013 IEEE International Geoscience and Remote Sensing Symposium - IGARSS, 2013Co-Authors: Biao Zhang, William Perrie, William G. Pichel, Zhongfeng QiuAbstract:We present a innovative physically-based approach to detect Oil Platforms by using compact polarimetric (CP) synthetic aperture data. We utilize two RADARSAT-2 fine quad-polarization SAR images of Gulf of Mexico to estimate the CP covariance matrix. The resulting CP data is used to reconstruct pseudo quad-polarization covariance matrix. The Stokes parameters are evaluated using the reconstructed pseudo quad-polarization covariance matrix elements. We further calculate the relative phase with two Stokes parameters. The relative phase is a logical scalar descriptor which can be used to detect the Oil Platforms. The detected Oil Platforms are validated with ground truth from NOAA. The proposed method provides a simple and effective mapping technique for Oil Platform detection.
William Perrie - One of the best experts on this subject based on the ideXlab platform.
-
compact polarimetric synthetic aperture radar for marine Oil Platform and slick detection
IEEE Transactions on Geoscience and Remote Sensing, 2017Co-Authors: Biao Zhang, William Perrie, Xiaofeng Li, Oscar GarciapinedaAbstract:Compact polarimetric (CP) synthetic aperture radar (SAR) can provide ocean surface observations with large-coverage swath and abundant polarimetric scattering information. These distinctive characteristics make CP SAR a potential tool for operational monitoring Oil slicks and Oil Platforms, overcoming the shortcomings of small spatial coverage by the traditional quad-polarization (quad-pol) SAR. In this paper, we use the RADARSAT-2 C-band quad-pol SAR data to generate CP covariance matrix elements and subsequently construct pseudoquad-pol backscatter coefficients, using two CP reconstruction algorithms to evaluate CP SAR’s applications in detection of Oil slicks and Oil Platforms. The reconstructed co- and cross-polarization data show good agreement with original radar observations acquired at different incidence angles and wind speeds. Furthermore, we develop an unsupervised classification method using the relative phase, a logical scalar threshold that separates odd and multiple scattering events, as an indicator to discriminate Oil slicks and Platforms from clean ocean waters. The relative phase is positive for clean ocean surfaces where odd scattering is dominant, but negative for Oil Platforms and Oil slick-covered areas associated with multiple scattering. The detections of Oil spills and Oil Platforms are validated against known Oil Platform geographic positions and optical aircraft surveys of the Oil slicks. The proposed method provides a promising technique to detect Oil slicks and Oil Platforms from CP imaging mode SAR data, i.e., as may be acquired by the RISAT-1, ALOS-2, and the future RADARSAT Constellation Mission.
-
IGARSS - Oil Platform detection by compact polarimetric synthetic aperture radar
2013 IEEE International Geoscience and Remote Sensing Symposium - IGARSS, 2013Co-Authors: Biao Zhang, William Perrie, William G. Pichel, Zhongfeng QiuAbstract:We present a innovative physically-based approach to detect Oil Platforms by using compact polarimetric (CP) synthetic aperture data. We utilize two RADARSAT-2 fine quad-polarization SAR images of Gulf of Mexico to estimate the CP covariance matrix. The resulting CP data is used to reconstruct pseudo quad-polarization covariance matrix. The Stokes parameters are evaluated using the reconstructed pseudo quad-polarization covariance matrix elements. We further calculate the relative phase with two Stokes parameters. The relative phase is a logical scalar descriptor which can be used to detect the Oil Platforms. The detected Oil Platforms are validated with ground truth from NOAA. The proposed method provides a simple and effective mapping technique for Oil Platform detection.
Zhang Guomin - One of the best experts on this subject based on the ideXlab platform.
-
Study on Generator Self-Excitation in Offshore Oil Platform Power System
Computer Simulation, 2012Co-Authors: Zhang GuominAbstract:When the offshore Oil Platform power system black-start,submarine cables for long-distance need to put in,the self-excitation of generator happen easily,which is bad to generator and other electrical equipments.But analyzing and inhibiting measures of self-excitation for land power system are not fit for island power system.According to the characteristics of offshore Oil Platform power system,the paper presented a suitable method for the offshore Oil Platform power system to restrain generator self-excitation.First,the paper introduced the basic principle and criterion of synchronous generator's self-excitation based on armature reaction of synchronous generator.The Louts criterion was used to get judgment basis and conditions of generator parameter in producing synchronous self-excitation.In one offshore Oil Platform power system,for example,the measures was posed through analysis of self-excitation in the offshore Oil Platform power system.Then the black-start path was simulated and calculated by PSCAD/EMTDC.The computer simulation result illustrates the effectiveness of the proposed method.
Wang Jian-feng - One of the best experts on this subject based on the ideXlab platform.
-
Impact of Wind Power Generator on Stability of Offshore Oil Platform Power Systems
Power system technology, 2009Co-Authors: Wang Jian-fengAbstract:The interconnection of wind power generator with isolated power system can conserve fuel and reduce operation cost. Impacted by the features of wind power generation, the wind power penetration greatly influences the stability of isolated power system while the fuel is conserved. In this paper, a model of multi-pole permanent synchronous wind turbine generator as well as a model of isolated power system involving gas turbine generation units are built and the stability of this isolated power system, to which the wind power generators are connected, for offshore Oil Platform supplied by gas turbine generators is evaluated. By means of simulation by PSCAD/EMTDC, the maximum wind power penetration of isolated power system supplies to offshore Oil Platform supplied by three gas turbine generators is researched while the wind power generators are connected. Simulation results and the successful interconnection of offshore wind power plant constructed by China National Offshore Oil Corporation show that the researched offshore Oil Platform supplied by isolated power system with wind power generators connected can keep the system frequency and voltage stability in desired range and the impacts of the switching of/off of the wind power generators on system voltage and frequency are acceptable.
