摘要 :
For space-borne P band Synthetic Aperture Radar (SAR) application, an airborne experimental circular&linear polarimetric SAR system is developed, this paper presents the instrument and airborne test result. Compared to linear polarization of P band, circular polarimetric SAR shows remarkable penetration efficacy in tropical jungle foliage covered region and subsurface targets detection. Besides, A new phenomenon of P band circular polarimetric SAR implies potential advantage in man-made linear object detection....
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For space-borne P band Synthetic Aperture Radar (SAR) application, an airborne experimental circular&linear polarimetric SAR system is developed, this paper presents the instrument and airborne test result. Compared to linear polarization of P band, circular polarimetric SAR shows remarkable penetration efficacy in tropical jungle foliage covered region and subsurface targets detection. Besides, A new phenomenon of P band circular polarimetric SAR implies potential advantage in man-made linear object detection.
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摘要 :
Polarimetric SAR interferometry (POLINSAR) is a very promising technique by combining polarimetric technique and interferometric technique. It can be applied to the area of remote sensing and measurement of structure over forest t...
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Polarimetric SAR interferometry (POLINSAR) is a very promising technique by combining polarimetric technique and interferometric technique. It can be applied to the area of remote sensing and measurement of structure over forest terrain. At present, many POLINSAR systems were developed, and the first POLINSAR prototype in China is also developed by 38th Research Institute of CETC. Lots of data are acquired by these systems, so POLINSAR techniques have been studied as hot research topics in the area of SAR remote sensing in recent years. In this paper, we introduce design of the POLINSAR prototype and some experimental results. This system can obtain 2m elevation accuracy by data processing.
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Online synchronization is a key technique for bistatic SAR system. Synchronization and system performance are closely related. In this paper, online synchronization technique of bistatic SAR system has been studied and the impleme...
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Online synchronization is a key technique for bistatic SAR system. Synchronization and system performance are closely related. In this paper, online synchronization technique of bistatic SAR system has been studied and the implementation block diagram has been provided. Hardware design and implementation of bistatic online synchronization sysem was finished. After integrating the online synchronization system into bistatic SAR systemm the flight trial of bistatic SAR has been successfully conducted and first bistatic SAR image in China has been obtained by adopting online synchronization technique.
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Since the birth of the synthetic aperture radar, how to enhance the resolution is the very important direction of the SAR research, with the resolution of airborne SAR come to 0.1m, for the design of the SAR system, the realizatio...
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Since the birth of the synthetic aperture radar, how to enhance the resolution is the very important direction of the SAR research, with the resolution of airborne SAR come to 0.1m, for the design of the SAR system, the realization of the ultra band signal is a difficult problem, in order to alleviate the press of the A/D acquisition and data store, adopting the technique of the bandwidth synthesis to get the range high resolution, in azimuth applying wavenumber domain method, through the azimuth processing in two-dimension, solving the problem of coupling, attaining the high-resolution of the azimuth. The paper introduced the principle of a high resolution SAR system, the arithmetic of high resolution range imaging, give the simulation result, preliminary flight results and expect the future work.
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摘要 :
Since the birth of the synthetic aperture radar,how to enhance the resolution is the very important direction of the SAR research,with the resolution of airborne SAR come to 0.1m,for the design of the SAR system,the realization o...
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Since the birth of the synthetic aperture radar,how to enhance the resolution is the very important direction of the SAR research,with the resolution of airborne SAR come to 0.1m,for the design of the SAR system,the realization of the ultra band signal is a difficult problem,in order to alleviate the press of the A/D acquisition and data store,adopting the technique of the bandwidth synthesis to get the range high resolution,in azimuth applying wavenumber domain method,through the azimuth processing in twodimension,solving the problem of coupling,attaining the high-resolution of the azimuth. The paper introduced the principle of a high resolution SAR system,the arithmetic of high resolution range imaging,give the simulation result,preliminary flight results and expect the future work.
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摘要 :
Since the birth of the synthetic aperture radar, how to enhance the resolution is the very important direction of the SAR research, with the resolution of airborne SAR come to 0.1m, for the design of the SAR system, the realizatio...
展开
Since the birth of the synthetic aperture radar, how to enhance the resolution is the very important direction of the SAR research, with the resolution of airborne SAR come to 0.1m, for the design of the SAR system, the realization of the ultra band signal is a difficult problem, in order to alleviate the press of the A/D acquisition and data store, adopting the technique of the bandwidth synthesis to get the range high resolution, in azimuth applying wavenumber domain method, through the azimuth processing in two-dimension, solving the problem of coupling, attaining the high-resolution of the azimuth. The paper introduced the principle of a high resolution SAR system, the arithmetic of high resolution range imaging, give the simulation results preliminary flight results and expect the future work.
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摘要 :
Aim at multiplicative speckle noise and little difference among targets in synthetic aperture radar (SAR) images, a target classification algorithm is proposed based on C-Means and support vector machines (SVMs). Its front part ad...
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Aim at multiplicative speckle noise and little difference among targets in synthetic aperture radar (SAR) images, a target classification algorithm is proposed based on C-Means and support vector machines (SVMs). Its front part adopts a C-Means clustering method to classify targets and suppress speckle noise in feature space, and its back part adopts an SVM classifier to improve classification accuracy in image space. Experimental results show that this algorithm can reduce the dimension of SVM and have a better classification performance using Ku-band SAR database.
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摘要 :
Aim at multiplicative speckle noise and little difference among targets in synthetic aperture radar (SAR) images, a target classification algorithm is proposed based on C-Means and support vector machines (SVMs). Its front part ad...
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Aim at multiplicative speckle noise and little difference among targets in synthetic aperture radar (SAR) images, a target classification algorithm is proposed based on C-Means and support vector machines (SVMs). Its front part adopts a C-Means clustering method to classify targets and suppress speckle noise in feature space, and its back part adopts an SVM classifier to improve classification accuracy in image space. Experimental results show that this algorithm can reduce the dimension of SVM and have a better classification performance using Ku-band SAR database.
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摘要 :
Polarimetric SAR interferometry (POLINSAR) techniques have been studied as hot research topics in the area of SAR remote sensing in recent years. At present, many POLINSAR systems were developed, and the first POLINSAR prototype i...
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Polarimetric SAR interferometry (POLINSAR) techniques have been studied as hot research topics in the area of SAR remote sensing in recent years. At present, many POLINSAR systems were developed, and the first POLINSAR prototype in China is also developed by 38th Research Institute of CETC. There is an urgent need for the data from these sensors to be calibrated, so that the relationships between radar backscatter and geophysical parameters can be properly established. In this paper, we introduce internal and external calibration of POLINSAR. Then, the validation of calibration accuracy is implemented based on reflectors in experimental site. The results indicate crosstalk and imbalance can be improved after calibration.
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摘要 :
The problem of how to determine the position of equivalent nadir point of bistatic SAR with geostationary illuminator and low earth orbit (LEO) or unmanned air vehicle (UAV) receivers is very important. Considering high-orbit (or ...
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The problem of how to determine the position of equivalent nadir point of bistatic SAR with geostationary illuminator and low earth orbit (LEO) or unmanned air vehicle (UAV) receivers is very important. Considering high-orbit (or huge-range) characteristic of geostationary bistatic SAR the paper treats the earth surface as an ellipsoid surface and gives several models related to range. After studying the internal relation between the range-surface and the iso-range contours on the earth surface the paper presents a simplex-based approach to determine the position of equivalent nadir point of geostationary bistatic SAR. In simulation experiments the theoretical analyses and the simplex-based approach are tested and verified and the influence of earth curvature has been observed and analyzed.
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